Westinghouse 1531172 Molded Case Circuit Breaker

The Westinghouse 1531172 Molded Case Circuit Breaker is a 3-pole AB DE-ION MCCB rated 40 A with a 600 VAC maximum, designed for industrial and commercial power distribution. Built on the F-Frame with a thermal-magnetic trip, it provides overload and short-circuit protection while offering an auxiliary contact (AUX) for remote status indication and feedback to control systems. It is commonly installed in switchgear, motor control centers, and distribution panels, with mounting options for panelboards, switchgear, or MCC installations; it operates at 50/60 Hz to support typical industrial power layouts. The auxiliary contact enables integration with alarm systems, PLCs, and remote monitoring for breaker position indication and status reporting. Common replacements include the Westinghouse FB3040 Thermal-Magnetic Circuit Breaker, reflecting interchangeability with other 40 A, 3-pole MCCBs in similar applications.