The Siemens 3RT2015-2SB41 is a SIRIUS S00 coupling contactor — a compact, 45 mm wide device designed for switching loads in control panels, typically isolating or coupling control signals in automation circuits. Its 24 VDC coil pulls in at 85% of rated voltage and holds across the full operating range of -25 to +60 °C. The spring-type terminals accept solid or stranded wire from 0.5 to 4 mm², so it wires straight into a standard DIN-rail terminal block without lugging.
At 48 V it drops to 2 A, at 110 V to 1 A, and at 400 V to 3 A, so the rating is voltage-dependent and follows a derating curve typical for DC switching. The contactor is rated for AC-1 (resistive) switching at up to 1000 operations per hour, and AC-3 (motor) at 750 ops/h — the AC-4 (inching/plugging) limit is 250 ops/h, which governs heavy-duty reversing or jogging applications. The mechanical life is 30 million cycles typical, so it's built for high-duty-cycle panels.
The S00 footprint is 45 mm wide, 70 mm high, 73 mm deep — that's the standard small-contactor envelope. Clearance: 10 mm upwards, 10 mm forwards, 10 mm downwards, 6 mm at the side. The mounting position is flexible — ±180° rotation on a vertical surface, and can be tilted forward/backward ±22.5°.