The Westinghouse FD3040 is a 3-pole, bolt-on molded‑case circuit breaker in the FD frame series, rated for 40 A at 600 V, designed for secure panel mounting in industrial power distribution. It delivers thermal‑magnetic overcurrent and short‑circuit protection for branch circuits and equipment in motor control centers, switchboards, and industrial control panels operating on 50/60 Hz. Common replacements include Eaton FD3040, Siemens HFD3040, and Square D FA3440.
