SIRIUS S12 contactor, AC coil 48–130 V
The Siemens 3RT1373-6AF36 is a SIRIUS-brand size S12 contactor with a 48–130 V AC coil rated for both 50 Hz and 60 Hz operation, drawing 17 VA at each frequency. The screw-type coil terminals and integrated auxiliary switch make it a direct fit for motor-starting and resistive-load switching in standard control panels. Mounting position is flexible: vertical surface with ±180° rotation, or tilted forward/backward ±30° at 0° rotation, or standing — useful when retrofitting into existing enclosures where the rail orientation is already fixed. The auxiliary contact block carries a rated current of 4 A at 230 V AC and 3 A at 400 V AC, with lower ratings at 24 V DC (3 A) and 110–125 V DC (0.55 A).
Dimensions are 225 mm height, 184 mm width, 180 mm depth — the S12 frame occupies a standard footprint on the mounting surface. Fastening is by screw fixing, not DIN-rail snap-on, so plan for drilled holes or a mounting plate. The main circuit terminals accept 1x (1–4 mm²) or 2x (1–4 mm²) solid or stranded copper; the same range applies to the auxiliary terminals.
Auxiliary contact ratings across the voltage range
The auxiliary switch is rated for breaking at multiple DC voltages: 3 A at 24 V, 1.5 A at 48 V, 0.55 A at 110 V and 125 V, 0.3 A at 220 V. On AC: 4 A at 230 V, 3 A at 400 V, 2 A at 500 V and 690 V. These are the maximum breaking currents — derate for inductive loads. The AC ratings at 400 V and 690 V cover the common European low-voltage distribution levels, while the 500 V rating suits some North American 480 V circuits.