Westinghouse FDB3040L Molded Case Circuit Breaker

The Westinghouse FDB3040L is a 40 Amp, 600 VAC, three-pole molded case circuit breaker designed for industrial electrical distribution and branch-circuit protection. It provides thermal-magnetic overcurrent and short-circuit protection and is intended for panel or switchboard mounting in motor control centers, switchboards, industrial automation panels, and manufacturing equipment requiring reliable medium-amperage three-phase protection. This FDB Frame, L-configuration breaker operates at 50/60 Hz and is commonly used in MCCs, switchgear, and other industrial control panels connected to 600 VAC power networks. Common replacements include Eaton FDB3040L, Siemens HFD3040, and Square D FA3440.