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

Published date: 29 October 2019

Product Line:
Circuit Breakers

Environment:
Electrical Distribution Equipment

Resolution:
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.

Examples:
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.

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