Patent ID: 8487724

Claim:
An electronic trip unit for a molded case circuit breaker, the trip unit comprising: a housing having a plurality of outer faces coupled to one another to form a plurality of enclosed chambers within the housing, wherein the housing is configured to separate the plurality of enclosed chambers and create a first exterior space between adjacent first and second ones of the enclosed chambers; a plurality of current transformers coupled to the housing, wherein each current transformer is housed within a respective enclosed chamber; a first dielectric wall coupled to the housing and positioned within the first exterior space, the first dielectric wall having a first width dimension; a first dielectric protrusion extending away from and along a peripheral edge of the first dielectric wall to allow the trip unit to move relative to a base of the molded circuit breaker during a trip event while maintaining a dielectric barrier between the trip unit and the base, the first dielectric protrusion having a second width dimension less than the first width dimension along an entirety of the first dielectric protrusion, the first dielectric protrusion being configured to be slidably inserted within a corresponding grooved dielectric member in the base when the trip unit is coupled to the base.