The Siemens 3RH2122-1JB40 is a SIRIUS coupling relay for switching auxiliary circuits, sized S00. It carries 2 NO instantaneous contacts rated 10 A at 24 V rated value and also 10 A at 230 V rated value, with a diode surge suppressor built into the coil circuit.
The 45 mm width and 73 mm depth fit standard S00 contactor spacing; clearance at the side is 6 mm, upwards and forwards 10 mm each. Wire termination accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm² solid or stranded.
The contacts switch 10 A at 24 V rated value and 10 A at 230 V rated value, with derated currents at higher voltages: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 3 A at 400 V, 0.5 A at 440 V, 2 A at 500 V, 0.26 A at 600 V, and 1 A at 690 V. The arcing time sits between 10 and 15 ms. Mechanical endurance of the contactor typical is 30,000,000 operations. The coil draws 2.8 W closing power at DC, with a diode suppressor across the coil for back-EMF management.
Minimum relative humidity is 10%. RoHS compliance date is 10/01/2009.