IEC Starters
IEC Starters
(OP)
Can someone tell me what the difference is in the selection of NEMA motor starters and IEC motor starters? In NEMA there are sizes like 1, 2, etc. Do IEC starters also have these sizes?
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RE: IEC Starters
Google NEMA vs IEC for an answer.
RE: IEC Starters
RE: IEC Starters
NEMA sizing - designed so that a common electrician can pick out a product based solely on motor size within a group that will work without much thinking about the application specifics. So it is designed around the worst case scenario for any given motor, i.e. inching and plugging duty. Came from the US Automotive industry where production lines changed every year or two, parts and electricians were cheap and plentiful and engineers were rare and expensive.
IEC sizing - designed to be picked out by an electrical engineer from a very specific set of application criteria based on motor size, starting frequency, expected component life, power factor of the load, ambient temperature and the hair color of your firstborn child. Came about in the post war European market in an environment where engineers were plentiful and electricians were not allowed to make such decisions because resources were too scarce to be wasted.
DP (Definite Purpose) = Don't Purchase! Sized to self-destruct at the end-of-equipment-warranty + 1 day.
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RE: IEC Starters
RE: IEC Starters
Here is one from Siemens, the charts start on page 2.
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The "Sizes" (S00, S0, S2 etc.) shown in this are frame sizes specific to Siemens only.
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RE: IEC Starters
IEC starters work well if we know enough about the application and intended use and do the correct selection. NEMA starters are overkill for most applications which gives them a built in safety factor.
RE: IEC Starters
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RE: IEC Starters