Motor starter
Motor starter
(OP)
How do overcurrent protection and zero voltage release incorporate in the starter? And how do they operate?
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RE: Motor starter
zero voltage relese there is no device called like that ther are single phase preventers and fuse failure monitors which take care of loss in voltage or one fuse
Regards
Eswaran
RE: Motor starter
Quite a few people are switching from NEMA to IEC style starters because of cost and features. MSP's are like circuit breakers, but in North America, they do not meet UL 489. Which means they can only be used for overload protection and not short-circuit protection. People are using these on top of contactors inplace of other removable heater design overloads.
Just a new trend.
Carl
RE: Motor starter
RE: Motor starter
Can you explain a little bit about the advantage of using MSP if you already have a breaker and a starter with overload? What else do you need? Or does it perform the overload function in place of the starter?
RE: Motor starter
I'm getting back to you kind of late...
The msp strictly takes the place of an overload unit. It's only advantages over a NEMA overload unit are single-phase protection (as a function of thermal OL), plug-in modules (shunt trip and undervoltage), and cost.
You still have to follow NEC 430... but you can use article 430 53c which allows for "group motor installation" It's up to the user.
Carl