The Siemens 3RH2244-1BF40 is a SIRIUS auxiliary contactor in the S00 frame size, carrying four normally open instantaneous contacts and a 110 V DC coil. It switches control signals or low-power loads in a motor starter or contactor assembly — the auxiliary contacts report status or interlock downstream devices, not carry main motor current. Rated for 10 A at 24 V, 6 A at 230 V, and 1 A at 690 V, so the contact rating drops as voltage rises — match your control voltage to the appropriate column in the spec table.
Clearance distances: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side — these are the minimum air gaps to maintain rated insulation (pollution degree 3 environment).
Coil and switching performance
Coil pick-up voltage is 0.8 x rated (88 V DC for this 110 V DC unit), drop-out is 0.1 x rated (11 V DC) — the margin between pick-up and hold ensures reliable pull-in even with a sagging control supply. Closing power and holding power are both 4 W DC — the coil stays cool because there is no AC inrush; a DC coil draws steady current once sealed.