The Siemens 3RH1122-2BP40 is a SIRIUS auxiliary contactor in size S00, with a 230 V rated coil and two normally-open instantaneous contacts. The IP20 front protection means it's suited for enclosed control panels where no washdown or dust ingress is expected at the operator interface.
The contact ratings are given per voltage: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 2 A at 500 V, and 1 A at 690 V. These are thermal current ratings for the auxiliary contacts — they define the maximum continuous current the contacts can carry at each voltage level. For a 24 VDC control circuit, the 10 A rating gives plenty of headroom for pilot lights, relays, or PLC inputs. At 230 V, the 6 A rating handles most contactor coils and small motor starters. The 1 A at 690 V rating is useful for higher-voltage control schemes in industrial environments.
Coil and environmental specs
The magnet coil draws 3.2 W DC for both closing and holding — a single-wattage coil, meaning no separate economizer circuit needed. The coil is rated for 230 V, so it's a direct fit for standard European control voltages. Shock resistance is 10g for 5 ms and 5g for 10 ms, adequate for machine-mounted applications near presses or conveyors.
Fastening is via screw and snap-on mounting — the standard DIN rail clip for size S00 contactors. Terminal capacity is 2x (0.25 to 2.5 mm²) solid or 2x (24 to 14 AWG) for auxiliary contacts, using screw terminals. Depth is 73 mm, height 60 mm, width 45 mm — compact enough for dense panel layouts.