Eaton WMZS3D40 Three-Phase Molded Case Circuit Breaker

The Eaton WMZS3D40 is a three-phase molded‑case circuit breaker rated for 40 A at 277/480 V AC and configured as a 3‑pole device for protection of three‑phase circuits in commercial or industrial panels. This specific WMZS3D40 model serves to interrupt fault current and safeguard feeders and equipment in distribution systems that run on 277/480 V three‑phase power. Identified by part number WMZS3D40, it belongs to Eaton’s molded‑case breaker family and is suitable for installations requiring reliable three‑phase protection at the stated voltage and current rating. When selecting this model, ensure the circuit amperage matches the protected circuit and that the breaker is compatible with the panel and wiring methods used in the installation.