What is the difference between a molded case vs an insulated case breaker?



Product Line:
Circuit Breakers

Electrical Distribution Equipment

An insulated case circuit breaker is a molded case circuit breaker with an integral 2-step stored-energy mechanism. They have the functionality of an iron-frame breaker, or a low-voltage-power breaker with a molded plastic instead of an iron frame.

Masterpact MTZ, NW, NT breakers are Molded Case breakers, but are considered to be Insulated Case breakers due to the inclusion of the 2 step stored energy mechanism (charging handle).
Powerpact B, H, J, L, M, P, and R breakers are Molded Case breakers.