The Siemens 3RH2122-2KF40-1AA0 is a SIRIUS coupling relay for switching auxiliary circuits, sized S00. It carries a 110 V coil with an integrated suppressor diode and two instantaneous normally-open contacts.
The 110 V coil pulls 13 W closing power. Contact ratings vary by voltage: 10 A at 24 V and 230 V, 3 A at 110 V and 400 V, 1.2 A at 220 V, 0.5 A at 440 V, 0.26 A at 600 V. The arcing time runs 10 to 15 ms. Mechanical life is typical 30,000,000 operations, with a maximum switching frequency of 10,000 1/h at AC and a minimum off-time of 7 to 20 ms at DC. Pollution degree 3 rated. Dimensions are 70 mm high, 45 mm wide, 121 mm deep. Relative humidity minimum 10 %.
This is a current-production part. The RoHS compliance date is 10/01/2009. No auxiliary switch extension is fitted from the factory.