The Siemens 3RH1122-2JC40-ZX95 is a SIRIUS coupling relay for switching auxiliary circuits, sized S00.
The 10 A at 24 V rating tells you this relay handles the control-circuit loads typical in a 24 VDC panel — solenoids, contactor coils, indicator lamps. The 6 kV surge voltage resistance means it withstands the switching transients that appear when you break inductive loads in a mixed-voltage cabinet, so you don't get nuisance failure on the auxiliary contacts. At that level, oxide films on standard contacts can block current; this part is designed to punch through. The solid conductor range is 2x (0.25 to 2.5 mm²), which covers standard control wiring in most panels. The depth of 73 mm and width of 45 mm fit the S00 footprint — common across SIRIUS contactors and relays, so it aligns with existing panel layouts.
Fastening is by screw or snap-on mounting. Shock resistance is 10g / 5 ms and 5g / 10 ms, which covers most industrial panel applications including near conveyor drives and compressors. The built-in surge suppressor is a diode, so for DC coils the suppression polarity matters — verify your circuit's free-wheel diode orientation if you're paralleling this with other relay coils on the same DC bus.