Panel fit and switching capacity
The 24 VDC coil holds at 0.85× rated and picks up to 1.85×, so it's happy on a regulated supply with some droop. Contacts are rated 10 A at 24 V and 230 V, then derate through the voltage ladder: 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 3 A at 400 V, down to 0.26 A at 600 V. That's a wide AC switching envelope for a 45 mm wide relay. AC switching frequency is 10,000 cycles per hour. Arcing time runs 10 to 15 ms; the integrated diode snubs the coil flyback.
DIN rail and wiring
Mounts via screw or snap-on onto 35 mm DIN rail — the S00 footprint is 45 mm wide, 57.5 mm tall, 73 mm deep. That means you can stack these in a 6 mm pitch on the rail if the panel layout is dense. Wire terminals accept 2× 0.5–1.5 mm² solid or stranded, 2× 0.75–2.5 mm², or 2× 4 mm².
Sourcing and cross-reference
The closest functional peer is the 3RH2122-1WB40 — same S00 frame, same contact configuration, but with a different coil voltage.