What this reversing contactor assembly delivers
The Siemens 3RA2337-8XB30-1AK6 is a SIRIUS reversing contactor assembly — two mechanically interlocked contactors in one package, so forward and reverse motor runs can't energise simultaneously. It's sized S2 and ships with two 3RT2037-1AK60 contactors pre-wired and interlocked. Rated 30 kW at 400 V AC-3 (65 A at 480 V, 62 A at 600 V), it handles reversing loads up to 50 hp on 460/480 V or 575/600 V supplies. The AC-3 switching frequency is 700 operations per hour maximum, so it's suited for frequent jogging or inching duty on conveyors, hoists, and pumps.
Panel fit and wiring constraints
Dimensions are 141 mm high, 120 mm wide, 130 mm deep — the depth is the dimension that sticks out from the DIN rail. That 50 mm² capacity on the main lug means it can take a single larger feed without pigtailing.