Siemens SIRIUS 3RH1140-1BE80 — auxiliary contactor, size S00, 4 NO
The 3RH1140-1BE80 is a Siemens SIRIUS auxiliary contactor in frame size S00, carrying four normally-open instantaneous contacts (4 NO). It switches up to 10 A in AC-12 duty (resistive loads at 24 V), making it the signal-level extension block for a contactor or relay stack in a motor control center. Rated operational current drops with voltage: 6 A at 230 V, 3 A at 400 V, 1 A at 690 V. The AC-12 figure governs the resistive load curve; for inductive or motor-circuit auxiliary switching, derate per the contactor's utilization category.
Wire termination accepts solid conductors: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² per terminal. Depth of 72 mm leaves clearance for gland plates and rear ducting.
Front face rated IP20; side clearances are 0 mm for side-by-side stacking. Shock resistance tested at 10g / 5 ms and 5g / 10 ms. Surge voltage withstand at 6 kV. Altitude limit 2 000 m without derating.
Coil and switching characteristics
DC magnet coil draws 3.2 W closing and holding — no pick-up surge beyond steady-state. No leading, delayed, lagging, or make-before-break contact configurations; this is a straight 4 NO block. Mechanical endurance typical at 30 million operations. The contactor size S00 mates physically with S00 power contactors (e.g. 3RT1 series) for auxiliary expansion.