The Siemens 3RH2131-1BF40-ZW97 is a size S00 contactor relay from the SIRIUS family, built for switching auxiliary circuits in motor control centers and industrial panels. It carries 3 NO + 1 NC instantaneous contacts and a 110 V DC coil. The relay snaps onto a 35 mm DIN rail and can be screw-fastened for vibration-prone environments. At 24 V DC rated value it switches 10 A; at 230 V AC rated value also 10 A; at 400 V AC rated value 3 A — so it handles control transformer secondaries, PLC outputs, and contactor coils across common line voltages.
Mounting and clearances
Width is 45 mm, depth 73 mm, height 58 mm. Mounting position allows +/-180° rotation on a vertical surface and tilt forward/backward by +/-22.5°. Required clearances: 10 mm upward, 10 mm forward, 10 mm downward, 6 mm at the side — tight enough for dense DIN-rail layouts. Fastening method is screw and snap-on onto 35 mm DIN rail, per EN 60715.
Switching performance and coil data
Coil closing power and holding power are both 4 W DC, so the coil driver sees a steady load. Arcing time is 10 to 15 ms; at DC the switching duration is 7 to 13 ms. Operating frequency at DC-12 duty reaches 1000 1/h, and at AC up to 10 000 1/h. Surge voltage resistance is rated at 6 kV — important for isolating control circuits from line transients. Pollution degree 3 (conductive pollution) means it's suitable for industrial enclosures where some condensation or dust is present.
Sourcing and fit
This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time. The 45 mm width and S00 footprint match the standard contactor relay slot in a motor control center bucket or DIN-rail sub-panel — no rewiring needed if replacing a same-size S00 relay.