Molded Case Circuit Breaker

Molded case circuit breakers carry their mechanism inside a sealed insulating housing, handling far higher currents than a rail-mounted breaker and often offering an adjustable trip to coordinate with what sits upstream. Engineers spec one when a main or feeder needs protection beyond miniature ratings, when a coordination study calls for an adjustable trip, or when an aging breaker can no longer be tested to its curve.

 

As an authorized electrical distributor for multiple manufacturers, we stock molded case circuit breakers from ABB and more across competing lines, in a range of frame types, actuator types and amperage ratings, so you can match the frame and interrupting rating the switchboard needs, compare frames and actuator types across brands, and coordinate a feeder with the protection above it. Same-day shipping on in-stock items ordered before 2pm local time.