SIRIUS 3RH2422-1BC40 — Auxiliary Contactor, Size S00, 24 VDC Coil
The Siemens SIRIUS 3RH2422-1BC40 is an auxiliary contactor in the compact S00 frame size, carrying 2 instantaneous normally-open contacts rated 10 A at 24 V.
The 10 A rating at 24 V is the resistive (AC-1 / DC-1) load curve for the auxiliary contacts — it switches signal-level loads, PLC inputs, or small relay coils without derating at that voltage. At 230 V the same contacts carry 10 A, but at 400 V they drop to 3 A, and at 600 V to 0.26 A; that's the arc-extinction limit in air at higher potentials. The 2 instantaneous contacts (NO) close on coil energization with no intentional delay — used for feedback to a controller or to interlock a starter. Mechanical endurance is 5 million switching cycles typical, and the AC switching rate is 10,000 operations per hour — that's about 2.8 operations per second sustained, which covers high-speed pick-and-place or packaging machine applications. The DC arcing time of 7–13 ms is the interval the arc persists on DC break; for DC control circuits, verify the load inductance doesn't exceed the contactor's making/breaking capacity at the operating voltage.
The S00 footprint is 57.5 mm high, 90 mm wide, 73 mm deep — it occupies roughly the same DIN-rail pitch as a miniature circuit breaker. The screw terminals accept 2 x 0.5–1.5 mm², 2 x 0.75–2.5 mm², or 2 x 4 mm² solid/stranded — sufficient for control wiring up to 12 AWG.