The Siemens SIRIUS 3RH1911-2FC22 is an auxiliary switch block with a 2 NO + 2 NC contact configuration, rated for a maximum of 10 A. It snaps onto the front of SIRIUS contactor relays and power contactors in the S00 frame size, using spring-loaded terminals for the control and auxiliary circuits.
Switching Ratings and Contact Reliability
The switching current varies significantly with voltage: 6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 3 A at 400 V. For AC-15 duty at 690 V, the rated value is 1 A. The block also carries a 10 A rating at 24 V and 6 A at 125 V, 230 V, and 250 V. Contact reliability is specified as one faulty switching operation per 100 million cycles at 17 V and 5 mA, and the mechanical service life is 10 million switching cycles typical.
Mechanical and Environmental Specs
Dimensions are 46 mm deep, 36.5 mm wide, and 37.5 mm high. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The front protection class is IP20. Surge voltage resistance is rated at 6 kV, and insulation voltage with pollution degree 3 is 690 V. The spring-loaded terminals accept 2x (0.5 to 1.5 mm²) with ferrule and 2x (0.5 to 2.5 mm²) without, or 2x (20 to 14 AWG).