WMZS1C40 Circuit Breaker by Eaton, Cutler Hammer or Westinghouse EATON MINIATURE CIRCUIT BREAKER 1 POLE 40 AMPS 277 VAC DIN RAIL MOUNT CAT# WMZS1C40 Reconditioned New Surplus Inventory Code: A Make an Offer Send to a Friend Voltage: 277 V Poles: 1 Frame Amperage: 40 A Mount: Plug-in WHSE Code: CB25A4 Return To Circuit Breakers