Westinghouse Electric Corporation KB3125 Circuit Breaker

The Westinghouse KB3125 Circuit Breaker delivers 125-amp, three-pole overcurrent and short-circuit protection for 600 V AC three-phase power systems. It is designed for panel-mounted installation in switchgear, panelboards, motor control centers, and industrial electrical panels, providing a thermal-magnetic trip with a 14 kA interrupt rating for reliable fault interruption. As part of the KB series, it is used in commercial and industrial electrical protection systems for branch circuits and equipment protection, including replacements for aging devices and upgrades to power distribution infrastructure. Common replacements include Eaton KB3125, Cutler-Hammer KB3125, and Square D KA36125.