Eaton / Westinghouse HLB3400 – 400A 3 Pole Molded Case Circuit Breaker Fast Shipping

Designed to support existing industrial infrastructure, this 400A thermal-magnetic breaker offers a 65kAIC rating at 240V. It mounts into classic Westinghouse switchboards and panelboards, serving as an exact fit for aging systems. Upgrading to the newer KD3400 requires a TAD3 spacer kit, making this original Mark 75 unit ideal for seamless maintenance. Operators benefit from its interchangeable trip unit and adjustable magnetic response, ensuring precise coordination for critical loads.