Integrator note
The Siemens 3RH2131-2BB40-1AA0 is a Size S00 contactor relay with a 24 V DC coil, 3 normally-open and 1 normally-closed main contacts, and spring-type terminals for tool-less wiring. The upright mounting position is specified; if the panel layout forces a horizontal orientation, verify the manufacturer's derating for that axis.
The Size S00 footprint snaps onto DIN rail and fits standard control-panel enclosures. Coil draw at 24 V DC is low enough that a standard PLC digital output can drive it directly, but verify the output's maximum sink current against the relay's inrush.