Westinghouse HKA3150T Molded Case Circuit Breaker Trip Unit

The Westinghouse HKA3150T is a 150 Amp, 3-pole thermal-magnetic trip unit designed for KA Series molded case circuit breakers used in industrial power distribution. It provides overcurrent protection with an 18 kA interrupt rating at up to 600 VAC and installs as an internal breaker trip assembly for switchgear, motor control centers, and distribution panels. As a KA Series component, it supports breaker trip control and protection duties in industrial and commercial power systems, enabling reliable three‑phase protection for equipment and wiring. This trip unit is commonly used for breaker repair, retrofit projects, and protection upgrades within OEM electrical assemblies and distributed power networks. Compatible equipment includes molded case circuit breakers configured for KA series protection, with common replacements including Westinghouse HKA3125T, Westinghouse HKA3200T, and Eaton KA3150T Trip Unit.