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i am working in a petrochemical co. and would like to know what are the principles for choosing circuit breakers for electromotors .
And got the following answer:
Hey, if u are from an IEC Country (ussually Europe), i can support. USA is governed by UL, NEMA and other standards. But i guess the followings are valid everywhere: 1. Motor need to be protected against Shortcircuit and overload. 2. Motor protection can be made with MCCB with magnetic protection only+ separate thermal overload relay. Or with thermo-magnetic trip units from MCCB-s. Be careful, the thermal protection must be according to the starting type of the motor: class 10 for normal start, class 20 for heavy, or class 30 for heavier start. Difference between Tripping classes is that a bigger tripping class allows a high current for more time. Normal start is class 10, and Motor protection "tailored" MCCB-s are on the market, cheap, and good, with magnetic protection( for shortcircuit)+thermal protection class 10. EX; Surion from GE, PKZ from moeller. There are also mccb-s with electronic trip units which allow seelection of tripping class! EX: GE's record plus MCCB-s frame E-G , with SMR 2 trip units: u can select line protecion mode, or motor protection class 10, 20, or 30!. Of course, 5-7 times more expensive.
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