Molded case circuit breaker

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.

File:Molded case circuit breaker.jpg

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

• http://ecmweb.com/content/basics-molded-case-circuit-breakers