The Siemens 3RH7122-1AH00 is a SIRIUS contactor relay in size S00, designed as a 4-pole switching element with 2 normally-open and 2 normally-closed auxiliary contacts, identified by the switching element code 22 E. The control supply voltage is AC only; the coil draws 27 VA apparent pick-up power and 5.4 VA apparent holding power at an inductive power factor of 0.8 and 0.27 respectively.
Rated operational currents — what the values mean for your circuit
The auxiliary contacts are rated at 6 A for 24 V, 230 V, and 400 V circuits, and at 1 A for 110 V and 690 V, with a derated 0.3 A at 220 V — these are the maximum continuous currents the contacts can make and break under the respective AC voltage conditions. For DC-13 duty (solenoid loads), the maximum operating frequency is 1 000 operations per hour, which sets the cycling limit for applications like valve or brake control. The contacts are specified for PLC-level reliability at 17 V and 5 mA, meaning they can switch low-energy signals without the oxide-film issues that plague standard contacts — important when feeding directly into a digital input card.
Installation altitude is limited to 2 000 m above sea level without derating. Shock resistance is 15g for 5 ms and 8g for 10 ms under sine-pulse conditions.
Auxiliary and control circuits terminate via screw-type terminals, accepting solid or stranded conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². Finely stranded wire with core-end processing uses the same ranges. The product supports an auxiliary switch extension, allowing additional contact blocks to be added on-site without removing the base relay.
For BOM freeze or second-source evaluation, the closest functional peer in the SIRIUS range is the 3RT7016-1AF01, which shares the same S00 frame size and DIN-rail footprint but uses a different coil voltage and contact configuration — verify the coil rating and contact arrangement before substituting.