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[ { "title": "DISCOVER | Brady\u0026#039;s Removeable Transparent Materials", "nid": "606", "body": "\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/contactus.html\u0022\u003E\u003Cimg alt=\u0022Fig 1\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022d1b1ee62-8639-4dd1-83df-7d7948c6c999\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Brady%20Transparent.png\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EDiscover Brady\u0027s range of cleanly removable transparent materials\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EProduct description\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EBrady B-521 and B-522 materials are engineered for use in temporary labelling applications where solvent resistance and print performance are required. They allow clean and easy removal without scraping and they do not damage the surface they were attached to.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EB-521, a polypropylene material, and B-522, a polyester material, both offer good solvent and low/high temperature resistance. In addition, B-522 offers good outdoor durability.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003EBoth materials are ideal to identify electronic and other components, for work in process identification, and for general purpose applications.\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EFeatures:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u25CF Clean and easy removal without scraping or surface damage\u003C/p\u003E\n\u003Cp\u003E\u25CF Excellent solvent and heat resistance\u003C/p\u003E\n\u003Cp\u003E\u25CF Indoor and outdoor use\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u00A0\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\n\u003Cstrong\u003EApplications:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003ETypically, this product is used in:\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u25CF Automotive\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u25CF Electronics\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u25CF Industrial applications\u003C/p\u003E\n\u003Cp class=\u0022text-align-justify\u0022\u003E\u25CF Appliance applications\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E1. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/contactus.html\u0022\u003ECHAT\u00A0\u003C/a\u003E\u003C/strong\u003Eto us for a Brady solution for your facility\u003C/p\u003E\n\u003Cp\u003E2. \u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cstrong\u003ESUBSCRIBE\u00A0\u003C/strong\u003Et\u003C/a\u003Eo receive these articles and more, straight to your inbox!\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cimg alt=\u0022brady 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002265bb413b-8522-48c7-9c55-16e6e5f596ca\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Brady%20transparent_0.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n", "created": "Jan 2022", "terms": "Electrical, Products, Brady" }, { "title": "DISCOVER | Eaton\u0026#039;s 5PX Gen2 UPS", "nid": "605", "body": "\u003Cp\u003E\u003Cstrong\u003EExceptional efficiency, manageability and energy metering capabilities \u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cimg alt=\u00225PX Gen 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022ff66c53b-4ac7-4ca6-94f9-0ccef19f8daf\u0022 height=\u0022138\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Eaton%205PX%20Gen%202%20UPS.jpg\u0022 width=\u0022138\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EAdvanced protection for\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EServers\u003C/li\u003E\n\u003Cli\u003ESwitches\u003C/li\u003E\n\u003Cli\u003ERouters\u003C/li\u003E\n\u003Cli\u003EStorage devices\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EPerformance and Efficiency\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EEaton 5PX Gen2 provides Unity power factor (W=VA) capability. With 11% more power than other UPS, it can protect more servers.\u003C/li\u003E\n\u003Cli\u003EEnergy Star 2.0 certified, 5PX Gen2 offers best-in-class efficiency performance to reduce energy consumption and cooling costs.\u003C/li\u003E\n\u003Cli\u003EEach 5PX Gen2 battery configuration provides the best size/runtime ratio.\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EManagement and Cybersecurity\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EInnovative graphical LCD display brings all operating information at first sight.\u003C/li\u003E\n\u003Cli\u003EEaton\u2019s intelligent Power Software seamlessly integrates with leading virtualization environments and cloud orchestration tools.\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003EAvailability and Flexibility\u003C/strong\u003E\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003E5PX Gen2 2200VA \u0026amp; 3000VA are available in RT2U format (optimized for rack mounting) or RT3U (for tower installation or short-depth racks).\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EResources: \u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E1. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnet.co.za/download/magnet-eaton-spx-gen2.pdf\u0022\u003EDOWNLOAD\u003C/a\u003E\u003C/strong\u003E the 5PX Gen 2 Brochure\u003C/p\u003E\n\u003Cp\u003E2.\u003Cstrong\u003E\u003Ca href=\u0022https://www.magnet.co.za/contactus.html\u0022\u003E CHAT\u003C/a\u003E\u003C/strong\u003E to us for an Eaton solution for your facility\u003C/p\u003E\n\u003Cp\u003E3. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003ESUBSCRIBE\u003C/a\u003E \u003C/strong\u003Eto receive these informative articles, straight to your inbox\u003C/p\u003E\n", "created": "Jan 2022", "terms": "Back-Up Power, Education, Products, Eaton" }, { "title": "LEARN | Motor Protection Pt 5 \u2013 Coordinated Motor Starters", "nid": "604", "body": "\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/contactus.html\u0022\u003E\u003Cimg alt=\u0022Motor Protection pt 5\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022db079057-2c20-4ac3-813c-277162e760a7\u0022 height=\u0022252\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Motors%20-newsletter%20image%205.jpg\u0022 width=\u0022503\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003EWhen it comes to downtime, motors are a disproportionally large contributor compared to other causes, simply because motors are used in so many processes, from pumping to material management. So, a failure in a motor will have a serious ripple effect on productivity.\u003C/p\u003E\n\u003Cp\u003EWe\u2019re wrapping up our series on Motor Protection. Before we get into the fifth and final instalment, take a moment to catch up on previous articles in the series\u2026\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-Pt-1--The-importance-of-Motor-Protection\u0022\u003E\u003Cstrong\u003EPart 1\u00A0\u00A0 \u00A0- \u003C/strong\u003Ethe importance of motor protection\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-2--Circuit-Breakers-vs-Fuses\u0022\u003E\u003Cstrong\u003EPart 2\u003C/strong\u003E\u00A0\u00A0\u00A0 - fuses vs circuit breakers\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-3--Considering-MPCBs\u0022\u003E\u003Cstrong\u003EPart 3\u003C/strong\u003E\u00A0\u00A0\u00A0 - Motor Protection Circuit Breakers (MPCBs)\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-4--Motor-Circuit-Breakers\u0022\u003E\u003Cstrong\u003EPart 4\u003C/strong\u003E\u00A0\u00A0\u00A0 - Motor Circuit Breakers\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003EIn the fifth instalment, we tackle coordinated motor starters...\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EHow do motors fail?\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThe most common failure mode for a motor is when it is under excessive load. Such a condition causes an increased draw of current, which then causes overheating. It\u2019s this overheating that causes the undue wear on motor components that ultimately results in failure.\u003C/p\u003E\n\u003Cp\u003EHowever, its short circuits in motors that pose the greatest dangers for the equipment, the installation, and for personnel. There are a few possible sources, but any short circuit can cause a sudden and massive surge of current within milliseconds that can melt and destroy contacts, produce electrical arcs and even explosions. Short circuits can not only cause physical damage \u2013 they can easily lead to catastrophic fires. In fact, it\u2019s estimated that\u00A060% of fires\u00A0are due to short circuits.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EStandards that address motor short circuits\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThe International Electro-technical Commission (IEC) has recognized that electrical faults in motor control are a critical situation that needs to be properly addressed to ensure safety of personnel and equipment, as well as productivity of an installation. Therefore, the IEC has developed specific standards and testing procedures to ensure that the combination of devices used to control motors \u2013 i.e. motor starters \u2013 is safe. This is achieved through\u00A0\u003Cem\u003E\u201Ccoordination\u201D\u003C/em\u003E.\u003C/p\u003E\n\u003Cp\u003EA \u2018coordinated starter\u2019 is a tested combination of short circuit protection devices (e.g. fuses or circuit breakers), switching devices, and overload protection devices. The motor starter combination is tested under extreme conditions and is required to clear the fault quickly, without damage to the installation or risk to the operator. This makes it the optimum, tested combination of devices to ensure safety.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThere are two types of coordination included in the\u00A0\u003C/strong\u003EIEC 60947-4-1\u00A0\u003Cstrong\u003Estandard: Type I and Type II. There is also an additional level of coordination specified by IEC 60947-6-2, which Schneider Electric refers to as \u2018Total Coordination\u2019. Let\u2019s have a look at how each of these are defined.\u003C/strong\u003E\u003C/p\u003E\n\u003Cp style=\u0022margin-left:18.0pt;\u0022\u003E1.\u003Cstrong\u003EType I Coordination.\u003C/strong\u003E\u00A0This coordination level provides a basic solution, which balances uptime and cost effectiveness. It\u2019s a good choice when machine uptime is not a priority, as this level does not provide continuity of service. Also, there are associated maintenance costs. Before restarting, replacement of the starter is recommended\u003C/p\u003E\n\u003Cp style=\u0022margin-left:18.0pt;\u0022\u003E2.\u003Cstrong\u003EType II Coordination.\u003C/strong\u003E\u00A0This is a high performance solution, providing reduced machine shutdown time and reduced cost of equipment replacement. The motor starter must be ready for reuse after a fault, with only a simple inspection required. Contacts may become welded but are easily separated.\u003C/p\u003E\n\u003Cp style=\u0022margin-left:18.0pt;\u0022\u003E\u003Cstrong\u003E3.Total Coordination.\u003C/strong\u003E\u00A0This is the highest possible performance, ideal for mission-critical operations and processes. There is no damage to the equipment, and following the fault the starter must be immediately reusable. No resetting is required, and no inspection is needed. Therefore, the installation can return immediately to operation. This level of coordination is listed under a different standard, as it is defined for combination devices with multiple functions.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EChoosing coordinated motor starters\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EYou can see that these levels of coordination enable a range of benefits, from protecting people and equipment, to permitting a greater continuity of service, to reducing maintenance costs by avoiding the time and cost of replacing equipment. Given the increasing costs of downtime and machine or process failures, it\u2019s clear that coordination of motor starters is moving from a choice to a necessity, as they deliver a tested, guaranteed solution.\u003C/p\u003E\n\u003Cp\u003ETo begin, you should first determine the level of coordination that suits your specific application and business requirements. Next, you should choose a manufacturer that has ensured that their motor starter complies with coordination standards. This requires testing the combination of components to the associated standard, and accordingly publishing the coordination tables for selection.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-Pt-5--Coordinated-Motor-Starters\u0022\u003E\u003Cstrong\u003EResources:\u003C/strong\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E1.\u003Cstrong\u003E \u003Ca href=\u0022https://go.schneider-electric.com/ZA_202110_Schneider-Learning-Series-Webinar-Current-Limitation_On-Demand-ER-LP.html?source=Webinar\u0026amp;sDetail=Schneider-Learning-Series_ZA\u0022\u003EWATCH\u003C/a\u003E \u003C/strong\u003Ea webinar on Current Limitation\u003C/p\u003E\n\u003Cp\u003E2. \u003Cstrong\u003E\u003Ca href=\u0022https://www.se.com/ww/en/work/products/industrial-automation-control/tools/motor-control-configurator.jsp\u0022\u003EEXPLORE\u003C/a\u003E\u003C/strong\u003E Schneider\u2019s EcoStruxure\u2122 Motor Control Starter Configurator\u003C/p\u003E\n\u003Cp\u003E3. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/contactus.html\u0022\u003ECHAT\u003C/a\u003E\u003C/strong\u003E to us for a Schneider Electric solution for your facility\u003C/p\u003E\n\u003Cp\u003E4. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news-letter.html\u0022\u003ESUBSCRIBE\u003C/a\u003E\u003C/strong\u003E to receive these informative newsletters straight to your inbox\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESource:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://blog.se.com/machine-and-process-management/2018/11/15/coordinated-motor-starters-the-right-choice-for-reduced-downtime-and-increased-safety/\u0022\u003Ehttps://blog.se.com/machine-and-process-management/2018/11/15/coordinated-motor-starters-the-right-choice-for-reduced-downtime-and-increased-safety/\u003C/a\u003E\u003C/p\u003E\n", "created": "Jan 2022", "terms": "Electrical, Education, Schneider" }, { "title": "LEARN | Motor Protection pt 4 \u2013 Motor Circuit Breakers", "nid": "603", "body": "\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cimg alt=\u0022Motors pt 4\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022e656ec7b-f760-47d3-9918-eebe13143a74\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Motors_-_newsletter_image_pt%204.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003EIn \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-Pt-1--The-importance-of-Motor-Protection\u0022\u003EPart 1\u003C/a\u003E \u003C/strong\u003Eof our series on Motor Protection, we outlined the importance of motor protection.\u003C/p\u003E\n\u003Cp\u003EIn \u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-2--Circuit-Breakers-vs-Fuses\u0022\u003E\u003Cstrong\u003EPart 2\u003C/strong\u003E\u003C/a\u003E, we unpacked the major differences between fuses and circuit breakers, and posed a compelling argument as to why the latter should be preferred.\u003C/p\u003E\n\u003Cp\u003EIn \u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-3--Considering-MPCBs\u0022\u003E\u003Cstrong\u003EPart 3\u003C/strong\u003E\u003C/a\u003E, we looked at four important reasons why you should specifically choose Motor Protection Circuit Breakers (MPCBs) for motor protection.\u003C/p\u003E\n\u003Cp\u003EWe continue to unpack motor protection in this fourth instalment of the series, by tackling motor circuit breakers.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EThe prevalence of motors in industries\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EIt\u2019s estimated that there are\u00A0more than 300 million electric motors in the world\u00A0being used in industry, infrastructure, and large buildings, with electric motor-driven systems (EMDS) accounting for between 43-46% of all global electricity consumption. Motors drive everything from processes, to commercial heating, ventilating, cooling, and refrigeration. With business productivity so dependent on them, it\u2019s important that they\u2019re properly protected.\u003C/p\u003E\n\u003Cp\u003EIn most jurisdictions, motor protection is mandatory, so OEM machine builders and electrical contractors will ensure that there is a circuit breaker used on each motor circuit. If the proper type of motor circuit breaker is selected, the motor will be adequately protected.\u003C/p\u003E\n\u003Cp\u003EUnfortunately, there are many examples in which a standard electrical distribution circuit breaker was chosen for this purpose. These breakers are typically selected because they are lower cost. But they are designed to protect standard types of circuits and loads, not motors. If such a breaker is used, there is a very high risk of motor damage, disruption and downtime for the end-customer, and fire.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EHere are five critical reasons behind why a dedicated motor circuit breaker should be used to protect a motor, not a distribution circuit breaker.\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E1.\u00A0\u00A0\u00A0 Risk of nuisance tripping during motor start-up\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EWhen a motor starts up, it draws current up to 10 times its rated value. This can last up to 30 seconds until it reaches its steady speed. Distribution circuit breakers typically have a magnetic threshold set at 8 times the rated current, or less. When current exceeds this threshold, the breaker identifies it as a short-circuit event on the distribution and trips immediately. For a motor, this type of overcurrent can simply represent regular starting up current. So you can see that a distribution circuit breaker used to protect a motor will very likely, and undesirably, trip when the motor starts up.\u003C/p\u003E\n\u003Cp\u003EIn contrast, dedicated motor circuit breakers are designed with their short-circuit trip threshold set much higher, usually 13 times the rated current. This avoids the risk of tripping during the motor start-up phase.\u003C/p\u003E\n\u003Cp\u003ETo save money while avoiding the risk of tripping on motor start-up, some contractors may select an overrated distribution circuit breaker, i.e. one with a higher threshold. Let\u2019s use the example of a 7.5 kW motor with 16 A rated current, and start-up current likely to reach 160 A. In this case, the contractor may choose a distribution circuit breaker rated at 25 A, with a magnetic threshold of around 200 A, so that motor start-up will not immediately trip the circuit breaker. However, there is the serious risk if the motor becomes overloaded during regular operation, reaching a current of up to 24 A, the 25 A rated breaker will not trip and the motor will be in serious risk of being destroyed after only a couple of minutes.\u003C/p\u003E\n\u003Cp\u003ENote that, in the next few years\u003Ca href=\u0022https://blog.se.com/machine-and-process-management/2014/05/14/high-efficiency-motors-european-directive-change-motor-starters-choice/\u0022\u003E, IE3/IE4 high-efficiency motors\u003C/a\u003E\u00A0will become mandatory in many regions. When using direct starters, these motors will have higher starting current that today\u2019s motor designs. This will make it even more important to choose the correct type of circuit breaker to protect these motors.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E2.\u00A0\u00A0\u00A0 Risk of nuisance tripping due to a transient overload\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EElectrical distribution circuit breakers are designed to protect cables. Their overload tripping times are set according to overcurrent withstand of cables, which is usually shorter than that of motors. So distribution breakers are likely to trip before the situation becomes dangerous for a motor. Keep in mind that motor protection relays, and dedicated motor electronic trip units, offer options to configure even slower overload protection for classes 10A, 10, 20, and 30.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E3.\u00A0\u00A0\u00A0 Risk of nuisance tripping due to high ambient temperature\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EMost distribution circuit breakers are designed to operate under 30 \u00B0C, or in some cases under 40 \u00B0C. If ambient temperature exceeds this rating, the breaker will trip at a lower current than its rating, unnecessary interrupting a process.\u003C/p\u003E\n\u003Cp\u003EIn contrast, motor circuit breakers are set for operation under 60 \u00B0C, or optionally 65 \u00B0C. So, a 10 A rated motor circuit breaker, protecting a 10 A rated motor will not trip when current is 10 A and ambient temperature is 60 \u00B0C. In this way, machines and operations keep running while motors are still properly protected.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E4.\u00A0\u00A0\u00A0 Risk of motor damage due to a phase fault\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EA phase fault can happen for many reasons: wiring errors after maintenance, loose connections, a utility phase loss, or even motor aging. Distribution circuit breakers are not equipped to trip in case of phase unbalance or phase loss, as these common conditions pose no hazard to distribution networks. But a phase fault is a critical event for motors, causing mis-operation (e.g. speed deviations) or the motor to overheat and eventually be damaged.\u003C/p\u003E\n\u003Cp\u003EMotor circuit breakers are designed to trip when sensing a phase fault. This will occur after a couple of seconds when the motor is running at regular speed, or after only a few tenths of seconds when it\u2019s starting up.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E5.\u00A0\u00A0\u00A0 Risk of contactor damage and fire due to short-circuit\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThe international standard for safety of machinery, EN 60204-1, requires at least Type 1 coordination between a circuit breaker and a contactor, in the case of a short circuit. Distribution circuit breakers are usually not tested in coordination with contactors; therefore, there\u2019s no performance guarantee of the combination. This means that if a short circuit occurs, the contactor can be destroyed and, worse, the amount of energy dissipated by the contactor during the interruption process can burn surround materials or ignite a fire.\u003C/p\u003E\n\u003Cp\u003EWith motor circuit breakers, short-circuit coordination can easily be selected: Type 1 ensuring no damage around the contactor, or Type 2 ensuring the contactor can still operate after the short-circuit event.\u003C/p\u003E\n\u003Cp\u003ESo you can clearly see, choosing a motor circuit breaker is critical to properly protecting motors and the installation. If you\u2019re an OEM, you may not always know in what kind of environment your machines will be installed. To maintain your customer\u2019s perception of quality, you need to ensure that your motors and machines are operating reliably under all conditions. During warranty periods and beyond, you need to make sure motors are protected while delivering the performance you promised. Having the right type of circuit breaker can be the difference between normal motor maintenance or costly substitution, and between continuous operation or costly disruption to your customer\u2019s productivity, or even a catastrophic fire.\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EResources:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E1.\u003Cstrong\u003E \u003Ca href=\u0022https://www.youtube.com/watch?v=eZ5WrvdBnGE\u0026amp;list=PL0AHvVniUcgwcgSxZ8bJbYGbHrqklEBLp\u0026amp;index=11\u0022\u003EWATCH\u003C/a\u003E \u003C/strong\u003ESchneider\u2019s motor management solutions\u003C/p\u003E\n\u003Cp\u003E2. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/contactus.html\u0022\u003ECHAT\u003C/a\u003E\u003C/strong\u003E to us for a Schneider Electric solution for your facility\u003C/p\u003E\n\u003Cp\u003E3. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news-letter.html\u0022\u003ESUBSCRIBE\u003C/a\u003E\u003C/strong\u003E to receive these informative articles straight to your inbox\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESource:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://blog.se.com/power-management-metering-monitoring-power-quality/2019/03/28/5-ways-that-motor-circuit-breakers-provide-optimal-protection-for-motors/\u0022\u003Ehttps://blog.se.com/power-management-metering-monitoring-power-quality/2019/03/28/5-ways-that-motor-circuit-breakers-provide-optimal-protection-for-motors/\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n", "created": "Jan 2022", "terms": "Electrical, Education, Schneider" }, { "title": "LEARN | Motor Protection pt 3 \u2013 Considering MPCBs", "nid": "602", "body": "\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cimg alt=\u0022Motor Protection pt 3\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u00221afeb783-7bb3-4895-8a76-9194b9587f0b\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Motors%20-%20newsletter%20image%203_1.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003EIn \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-Pt-1--The-importance-of-Motor-Protection\u0022\u003EPart 1\u003C/a\u003E \u003C/strong\u003Eof our series on Motor Protection, we outlined the importance of motor protection.\u003C/p\u003E\n\u003Cp\u003EIn \u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-2--Circuit-Breakers-vs-Fuses\u0022\u003E\u003Cstrong\u003EPart 2\u003C/strong\u003E\u003C/a\u003E, we unpacked the major differences between fuses and circuit breakers, and posed a compelling argument as to why the latter should be preferred.\u003C/p\u003E\n\u003Cp\u003EWe\u2019re continuing the series with this third instalment by taking a look at four important reasons why you should specifically choose Motor Protection Circuit Breakers (MPCBs) for motor protection.\u003C/p\u003E\n\u003Cp\u003ESince the late 19\u003Csup\u003Eth\u003C/sup\u003E\u00A0century when they were invented, motors have transformed our lives. \u003Cstrong\u003EWhile most of us now take motors for granted, machine builders and industrial engineers must treat them very seriously because of the costs of downtime if any of them break down.\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EA very common question is, \u201CWhy do we need a special motor protection circuit breaker (or MPCB)? Isn\u2019t a normal circuit breaker enough?\u201D\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EIn \u003Ca href=\u0022https://www.magnet.co.za/solutions-electrical/news.php?type=articles\u0026amp;name=LEARN--Motor-Protection-pt-2--Circuit-Breakers-vs-Fuses\u0022\u003E\u003Cstrong\u003EPart 2\u003C/strong\u003E\u003C/a\u003E, we discussed the catastrophic results of not adequately protecting your motors. In this post, we compare devices that are used for motor protection. Since approximately 80% of motors worldwide are rated at less than 15kW, we focus on the devices used to protect these motors, specifically contrasting miniature circuit breakers (MCBs) with thermal-magnetic MPCBs.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EBut first, let\u2019s clear up one common misconception \u2013 not all MCBs are created equal!\u003C/strong\u003E Depending on the type of load, the protection under short circuits (magnetic protection), and protection under overloads (thermal protection), there are different types of trip curves for MCBs. This article will talk only about two kinds:\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EC-curve MCB: Designed to protect general electrical distribution circuits from short circuits and overloads.\u003C/li\u003E\n\u003Cli\u003ED-curve MCB: Designed specifically to protect inductive circuits, including motors.\u003Ca href=\u0022https://www.magnet.co.za/contactus.html\u0022\u003E\u003Cimg alt=\u0022Fig 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002289044c44-7d7a-44e6-b8c7-bb3531fa29b4\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Schenider%20image%20for%20article_0.jpg\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003ENow, let\u2019s look at four important reasons that you should choose MPCBs for motor protection.\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E1.\u00A0\u00A0 Standards matter when it comes to circuit breakers\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EWhen comparing standards related to MCB and MPCB, it\u2019s clear there are some important differences:\u003C/p\u003E\n\u003Cul\u003E\n\u003Cli\u003EMPCBs are certified under\u00A0IEC 60947-4, which is the relevant standard for motor protection. However, since they are fundamentally circuit breakers, they are also certified under IEC 60947-2.\u003C/li\u003E\n\u003Cli\u003EMCBs are typically certified under\u00A0IEC 60898-1\u00A0(residential applications), though many are also certified under\u00A0IEC60947-2. This is an important point: IEC 60898 is\u00A0\u003Cem\u003Enot\u00A0\u003C/em\u003Eintended for industrial environments. For example, it defines ambient temperature as 30 \u2070C, which is far too low for a typical factory setting. Even if you did choose an MCB which is certified under the correct standard, MCBs have no compensation for ambient air temperatures \u2013 a feature that is standard with Schneider MPCBs. This can cause nuisance tripping, with all the associated costs of downtime.\u003C/li\u003E\n\u003C/ul\u003E\n\u003Cp\u003E\u003Cstrong\u003E2.\u00A0\u00A0 Optimal short circuit performance\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003ENow let\u2019s look at the performance of the devices under a short-circuit. First, a C-curve MCB is designed to trip between 5-10 times the rated current, whereas MPCBs are designed to trip at 12 times the rated current. The first reaction of many people to this is that the C-curve MCB is more sensitive and therefore superior but let me explain why that\u2019s not accurate.\u003C/p\u003E\n\u003Cp\u003EYou\u2019re dealing with an induction motor for which you\u00A0\u003Cem\u003Eexpect\u003C/em\u003E\u00A0to see an initial surge of current 8-10 times the rated current, by design. That\u2019s why the MPCB, which is specifically designed for this application, is designed to trip at higher currents \u2013 to avoid nuisance tripping. With the advent of high-efficiency IE3 and IE4 motors in the market, this problem is exacerbated as these motors have higher starting currents.\u003C/p\u003E\n\u003Cp\u003ESome try to get around this by selecting the MCB based not on the rated current, but on the trip current, i.e. they oversize the MCB to compensate. This can work to protect the motor from short-circuits but introduces issues under overload conditions, which I will discuss later.\u003C/p\u003E\n\u003Cp\u003EA D-Curve MCB, on the other hand, will work for short-circuit protection. However, you can\u2019t get a\u00A0\u003Ca href=\u0022https://blog.se.com/machine-and-process-management/2018/11/15/coordinated-motor-starters-the-right-choice-for-reduced-downtime-and-increased-safety/\u0022\u003Ecoordinated motor starter\u003C/a\u003E\u00A0with any MCB, so it\u2019s not a perfectly safe solution.\u003C/p\u003E\n\u003Cp\u003ESecond, the short-circuit breaking capacity of MCBs is generally restricted to 10 kA, which is often too low for industrial environments. Compare this with MPCBs that can offer up to 100 kA breaking capacity, which ensures that the motor starter and the motor remain safe and operable even in demanding conditions.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E3.\u00A0\u00A0 Overload performance\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThe most common faults that we see in motors are overload faults, accounting for over half the total motor failures worldwide. It\u2019s here that the MPCB really shines over the MCB. The table below shows the tripping behavior of an MPCB under overload conditions, as defined by trip classes in IEC60947-4\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/contactus.html\u0022\u003E\u003Cimg alt=\u0022Table 1\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u0022b628253f-d2ba-46a8-9bcd-88ad63adb9d5\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Table%201_2.png\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003ENow let\u2019s look at a similar table for MCBs.\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://www.magnet.co.za/news-letter.html\u0022\u003E\u003Cimg alt=\u0022Table 2\u0022 data-entity-type=\u0022file\u0022 data-entity-uuid=\u002201130f2e-686b-4a3e-9be8-7e1414c2d792\u0022 src=\u0022/cms/drupal8-magnetgroup/sites/default/files/inline-images/Table%202.png\u0022 class=\u0022align-center\u0022 /\u003E\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003EAs you can see, there\u2019s a clear difference. Repeated overloads of 50% or more can seriously damage the motor. The MCBs are clearly not going to trip fast enough to protect the motor windings. In addition, if you look at the last column, the issue becomes even more apparent. The C-curve MCB treats this as a short circuit and the D-curve trips within one minute, whereas the MPCB is much more sensitive and trips within 10s. Coming back to my earlier point, if you oversize the C-curve MCB to compensate for its lower tripping current, you end up running a huge risk of not protecting the motor at all under overloads.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003E4.\u00A0\u00A0 Sensitivity to phase failure\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003EThere\u2019s one more problem with using an MCB for motor protection \u2013 it\u2019s not sensitive to phase failures. A phase failure in a motor is a serious issue that causes a surge in current in the other phases, again leading to overheating and damage to the winding. The MPCB will detect this as being equivalent to an overload in the other phases and trip as per the table above \u2013 the MCB will not.\u003C/p\u003E\n\u003Cp\u003EIn conclusion, an MCB is not adequate to protect your motor and using just an MCB is fraught with risk. Apart from this, an MPCB is easier to select as the motor ratings are clearly declared on the product itself. It is possible to tune it to your particular application with an accurately adjustable reference current. The operating life of an MPCB is also typically much higher than an MCB.\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003EResources:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E1. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/download/magnet-te-sys-ebrochure.pdf\u0022\u003EDOWNLOAD\u003C/a\u003E\u003C/strong\u003E Schneider\u2019s TeSys GV Range brochure \u00A0\u003C/p\u003E\n\u003Cp\u003E2. \u003Cstrong\u003E\u003Ca href=\u0022https://www.se.com/ww/en/work/products/product-launch/tesys/\u0022\u003EDISCOVER\u003C/a\u003E\u003C/strong\u003E Schneider\u2019s solutions for protecting your entire machine application, not just the motor\u003C/p\u003E\n\u003Cp\u003E3. \u003Cstrong\u003E\u003Ca href=\u0022https://www.se.com/ww/en/work/products/industrial-automation-control/tools/motor-control-configurator.jsp\u0022\u003EEXPLORE\u003C/a\u003E\u003C/strong\u003E Schneider\u2019s EcoStruxure\u2122 Motor Control Configurator\u003C/p\u003E\n\u003Cp\u003E4. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/contactus.html\u0022\u003ECHAT\u003C/a\u003E\u003C/strong\u003E to us for a Schneider Electric motor protection solution for your assets\u003C/p\u003E\n\u003Cp\u003E5. \u003Cstrong\u003E\u003Ca href=\u0022https://www.magnetgroup.co.za/news-letter.html\u0022\u003ESUBSCRIBE\u003C/a\u003E\u003C/strong\u003E to receive these informative articles straight to your inbox\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n\u003Cp\u003E\u003Cstrong\u003ESource:\u003C/strong\u003E\u003C/p\u003E\n\u003Cp\u003E\u003Ca href=\u0022https://blog.se.com/power-management-metering-monitoring-power-quality/2020/04/27/dont-risk-motor-damage-4-reasons-to-choose-the-right-protection/\u0022\u003Ehttps://blog.se.com/power-management-metering-monitoring-power-quality/2020/04/27/dont-risk-motor-damage-4-reasons-to-choose-the-right-protection/\u003C/a\u003E\u003C/p\u003E\n\u003Cp\u003E\u00A0\u003C/p\u003E\n", "created": "Jan 2022", "terms": "Electrical, Education, Schneider" } ]