The Westinghouse Cutler-Hammer HKB3125T Trip Unit is a 125 A nominal replacement unit for JB/KB-type circuit breakers. It is designed to install in compatible Westinghouse Cutler-Hammer panels and carries the part number 1293C32G04. This trip unit governs protective actuation to provide overcurrent protection for the supported breaker, helping ensure the electrical system trips when the current reaches the specified rating. Use is limited to equipment listed as compatible with HKB3125T replacement units.
