Westinghouse Electric NP45789-A Circuit Breaker

Westinghouse NP45789-A Circuit Breaker is a 3-pole, 100 Amp, 600 VAC molded‑case device designed for industrial power distribution and electrical protection. This thermal-magnetic trip breaker provides branch circuit and motor protection in manufacturing facilities, motor control centers, HVAC equipment, and distribution panels, supporting reliable interruption on three‑phase systems at 50/60 Hz. With a panel‑mount design and molded case frame, it fits standard industrial installations and is suitable for motor control centers and distribution panels. The NP45789-A is rated for industrial duty and employs a thermal magnetic trip mechanism to deliver fast fault interruption while minimizing nuisance trips in demanding environments. Common replacements for this Westinghouse model include Eaton FD3100 and Square D FA34100, offering alternative sourcing for maintenance or retrofit projects. This part specifies a 3-pole, 100 A, 600 VAC circuit protection solution appropriate for protecting motors and other equipment on three‑phase power systems, ensuring safe and continuous operation.