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On a LAL34400MC, what is the MC suffix?

MC stands for Mission Critical breaker. The LA High Magnetic Withstand Circuit Breaker is designed to trip at a higher magnetic trip level. Typical Molded Case Circuit Breakers (MCCBs) and Molded Case Switches used in these applications will trip at 5-10 x the
handle rating. The LA High Magnetic Withstand Circuit Breaker utilizes higher magnetic trip levels and trips at 18-20 x the handle rating.
400 A = 18 x
200, 225 and 250 A = 20W
The LA high magnetic withstand circuit breaker allows the downstream branch circuit breaker which is upstream from the fault and nearest to the fault to clear the fault.



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