The Siemens SIRIUS 3RH1140-2BE40 is an auxiliary contactor in the size S00 frame, designed for switching control and signaling circuits in motor starter and contactor assemblies. It carries four normally open (4 NO) instantaneous contacts and zero NC, make-before-break, or delayed poles — a clean NO-only block for extending a contactor's auxiliary circuit. Rated operational current reaches 10 A at 24 V (AC-12 duty), 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V — the AC-12 resistive load curve governs the contact rating, so it is suited for pilot-duty and control transformer loads, not motor starting. The maximum AC-12 rating is 10 A. Mounts via screw or snap-on to DIN rail (35 mm), occupies 45 mm width, 60 mm height, 73 mm depth. The mounting position is flexible: +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward. Pollution degree 3 (industrial environment), IP20 on the front face. Coil holding power is 3.2 W DC, and the coil closing power is also 3.2 W DC. Surge voltage resistance rated at 6 kV. Operating temperature range -25 to +60 °C, storage and transport -55 to +80 °C. Shock resistance 10g / 5 ms and 5g / 10 ms.
Panel Integration
The 45 mm width matches the standard S00 contactor footprint — direct side-by-side ganging with a 3RT10xx contactor on the same DIN rail, zero gap required at the side (0 mm spacing). Solid connection accepts 2x (0.25 to 2.5 mm²) per terminal.