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Advanced Engineering 2020

NEC, Birmingham(B40 1NT)

04/11/2020 - 05/11/2020

The UK's largest annual advanced manufacturing trade show, Advanced Engineering is your opportunity to (more)

Drives & Controls Exhibition

NEC, Birmingham(B40 1NT)

25/01/2021 - 27/01/2021

The show brings together key suppliers of state-of-the-art equipment representing the multi-tasking culture (more)

How do you choose the right motor starter?

How do you choose the right motor starter? A traditional motor starter for use in a control panel is made up of three fuses, a contactor and an overload with, of course, variations on this theme for reversing, star-delta and other more specialised starter types. Starters based on this apparently simple arrangement are, in fact, still widely used, even in new equipment. There's nothing wrong with this, especially as this arrangement, in many cases, involves the lowest expenditure on starter components. It's worth noting, however, that this doesn't necessarily mean the lowest cost per starter - the traditional design has a lot of components to be mounted, and involves a lot of wiring. The resulting labour costs can easily outweigh the savings on hardware. An attractive alternative to the traditional starter is a version which uses just two components - a motor-protective circuit-breaker and a contactor. The motor-protective circuit-breaker combines short-circuit and overload protection in a single device, entirely eliminating the need for fuses. Often, it also provides facilities for isolation and in certain circumstances the switch can be used for the emergency-stop function in accordance with IEC/EN 60204-1. Now there are only two components, at the most, to mount and wire, resulting in significant savings in labour costs. Further, the designer now only has to select the right contactor to go with the circuit breaker, and Type 2 coordination can be guaranteed. Some control gear suppliers, including Moeller Electric, take this two component starter idea a step further, by providing motor starter combinations where the breaker and contactor connect together directly, without the need for any wiring at all. Not only does this save even more wiring time, it also produces what is, in effect, a compact fuseless motor starter which is a single unit that can be mounted simply by clipping it to a DIN rail. The starters we have considered so far have all been individual units which require their own power, motor and control connections, but there's a trend towards decentralised and networkable motor starters where the power and control connections are taken care of automatically.
Moeller Electric

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