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On KAL type Circuit Breakers what do suffixes 311 and 315 mean?

These are special magnetic calibration suffixes that mean:
311: is built to handle 10 times the handle amperage for 1.5 cycles of inrush current.
315: is built to handle 14 times the handle amperage for 1.5 cycles of inrush current.


CTA-ID : 2032566
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