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  moulded case circuit breaker is used to generally industrial or residential buildings as protection against short-circuit . For example, if a motor is 5 kilowatts,we often chose 10A of moulded case circuit breaker. when there is a short-circuit in the motor or line, It can cut off power timely.

The rated insulation voltage of this circuit breaker is 750V which is applicable for the electricity distribution net of AC 50Hz, rated working voltage 690V and below, rated working current from 6A to 630A. It is used to distribute electric power and protect the line and power apparatus from being overload and short-circuit protection of the motor.
    This KNM1L Moduled Case sircuit Breaker can be installed vertically and horizontally.
    This product complies with standard IEC60947-2.GB14048.2.

Molded Case Circuit Breaker
Small Size Molded Case Circuit Breaker
Electrical Molded Case Circuit Breaker
Automatic Molded Case Circuit Breaker
MCCB

https://www.korlenelectric.com/knm1-series-moulded-case-circuit-breaker/