The Siemens SIRIUS 3RT2037-1AP04-3MA0 is a Size S2 power contactor rated for 65 A at 480 V in AC-3 duty — the motor-switching curve that governs most induction-motor loads up to that current. Screw-type coil terminals and a 55 mm wide body mean it lands on a standard 35 mm DIN rail (DIN EN 60715) with screw and snap-on fastening, so it fits a panel layout already tooled for SIRIUS contactors.
Mounting and clearances
Mounting position allows ±180° rotation on a vertical surface and ±22.5° tilt forward/backward. Minimum air clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. Depth is 174 mm, height 114 mm, width 55 mm.
Switching performance and coil data
Rated switching frequency: 800 cycles/hour at AC-1, 700 at AC-3, 400 at AC-2, 200 at AC-4. Arcing time spans 10 to 20 ms; closing time is 10 to 18 ms. The coil is rated at 230 V at 50 Hz. Mechanical life is typical 10 million operations.