SIRIUS S00 Contactor, 12 A AC-3, 110 V DC Coil
The Siemens SIRIUS 3RT2317-2BF40 is a size S00 contactor rated for 12 A operational current at 400 V in AC-3 duty, which translates to 5.5 kW motor-switching capacity at 400 V — the figure that governs real motor loads like pumps, fans, and small conveyors on a 400 V three-phase line. The coil is 110 V DC; verify control voltage matches before wiring. Both the main current circuit and the magnet coil use spring-loaded (spring-type) terminals, accepting 2x (0.5... 2.5 mm²) solid or stranded — no screw torque to check, but strip length matters for a clean insertion.
Dimensions are 45 mm wide, 70 mm high, 73 mm deep, so it occupies a single 45 mm module on the rail; side-by-side mounting is permitted with a 6 mm gap at the side for airflow and arc clearance.
Electrical Ratings and Duty
Rated for AC-3 at 400 V at 12 A and 5.5 kW; in AC-4 (reversing/inching duty) at 400 V it handles 4 kW — the AC-4 figure matters if the contactor sees frequent plugging or jogging.