Universal base of molded case circuit breaker

The utility model provides a universal base of a molded case circuit breaker, which comprises a shell and a plurality of accommodating cavities used for installing thermomagnetic trips or current trips or circuit board covers, connecting pieces used for fixing the current trips are arranged in the accommodating cavities, supporting halfpace used for fixing the current trips are arranged on the side walls of the accommodating cavities, and the supporting halfpace is arranged on the side wall of each accommodating cavity. The connecting piece is provided with a strip-shaped groove used for being matched with the circuit board cover, the containing cavity is further internally provided with a groove where the heat magnetic release is clamped, and the groove is provided with a wire passing hole. The universal base can overcome the defect that bases of a molded case air switch circuit breaker, a molded case electronic circuit breaker and a molded case leakage protection circuit breaker in the prior art cannot be u