Question: What is the differance between MCB and MCCB in theory of operation? 

Answer: There are wide range of circuit breaker equipment, both MCB and MCCB(Molded Case Circuit Breaker). The range of MCB boards are highly durable and allow the installer maximum flexibility.\nThere is a huge number of variations with Current ratings from 6 Amps to 40 Amps. \nDifferent series including High rupture capacity, Single to four Pole. \nHigh breaking capacity: 20 - 15 - 10 - 6 K A Nominal rated currents from 0.5 to 63 A Wide range of the executions for both the MCBs and the accessories combined main contacts. \n\nThe 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.\n\nDepending upon the application and required protection, an MCCB will use one or a combination of different trip elements that protect against the following conditions:\n\nThermal overloads; Short circuits; and Ground faults.
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