The Siemens SIRIUS 3RH2422-1BF40 is a size S00 auxiliary contactor with two normally-open instantaneous contacts and a 110 V DC coil.
The 2 NO contacts are rated for DC switching across a voltage ladder: 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, and 0.5 A at 440 V. At 690 V AC the contacts carry 1 A. These are the maximum continuous currents at each voltage level — the contactor's arcing time of 10 to 15 ms and DC switching time of 7 to 13 ms govern how cleanly it breaks inductive loads. For a 110 V DC control circuit, the 3 A rating means it can handle multiple PLC output cards or relay coils in parallel without derating, provided the total inrush stays under that figure. The mechanical life of 5 million operations is typical for this class; the electrical life will be lower and depends on the switched load.
Dimensions are 90 mm wide, 57.5 mm tall, and 73 mm deep — the depth includes the coil terminals. Required clearances for arc flash and heat dissipation: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the sides. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° on a vertical surface, giving flexibility in tight or angled cabinets.