Molded case circuit breaker
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The traditional molded-case circuit breaker uses electromechanical (thermal magnetic) trip units that may be fixed or interchangeable. An MCCB provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device. Both these devices act mechanically on the trip mechanism.
Depending upon the application and required protection, an MCCB will use one or a combination of different trip elements that protect against the following conditions:
Thermal overloads; Short circuits; and Ground faults.
See also