The General Electric GE ZENITH 400 AMP AUTOMATIC TRANSFER SWITCH 277/480 VAC 3 PHASE ZTG4A40FC-7 is a sensor/switch from General Electric. It detects a change in state, position, or presence and relays that information to a controller or operator interface. Key specifications noted on this listing include 480 VAC, 400 AMP, 3 PHASE. It is commonly in factory automation and machine control retrofits.
