Benefits of NEMA rated control relays versus IEC
Benefits of NEMA rated control relays versus IEC
(OP)
My company specifies NEMA rated control relays for our projects. I presume this is because they are more durable. I do relaize they take up more space and are more costly, but is there any other benefit in specifying NEMA rated relays versus IEC?





RE: Benefits of NEMA rated control relays versus IEC
RE: Benefits of NEMA rated control relays versus IEC
Motor control contactors are an entirely different situation.
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RE: Benefits of NEMA rated control relays versus IEC
RE: Benefits of NEMA rated control relays versus IEC
1)Life cycle of the equipment.
a)IEC = shorter cycles, 5yrs or less.
b)NEMA = longer than 10 years
2)Enviroment.
a)IEC = packaging operation.
b)NEMA = steel mill/foundry.
3)duty cycle.
a) IEC = lower (10 cycles per day)
b) NEMA = Higher (100 cycles per day)
Jreaf makes an excellent point about motor starter units. I find the key is to "upsize" by one model when selecting IEC units, or another way to put it, only use 60% of the rated capacity.
All of the above statements are based on my personal observations only, others may differ from mine. At the end of the day, that is all we have until an industrial or commercial " Consumer Reports " is actually published.
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