The traditional molded-case circuit breaker uses electromechanical (thermal magnetic) trip units that may be fixed or interchangeable. Both these devices act mechanically on the trip mechanism. The main distinctions between molded-case and miniature circuit breaker are that the MCCB can have current ratings of up to . Molded Case Circuit Breakers are designed to provide circuit protection for low voltage distribution systems.
They will protect connected devices against both overloads and short circuits.

They are most-commonly-used in panelboards and switchboards where they are fixed mounte though some of the larger MCCBs .

Most molded case circuit breakers utilize one or more different trip elements to provide circuit protection for different applications.

These trip elements protect against thermal overloads, short circuits and arcing ground faults. A current overloa however large, cannot be detected. This may be done in an attempt to increase . These circuit breakers are applied in panelboards, switchboards, motor control centers, control .

















