The Siemens 3RH1911-1GA13-ZW96 is a SIRIUS auxiliary switch block with a 1 NO + 3 NC contact configuration (53 E per EN 50011), designed for use with contactor relays and power contactors. It snaps onto a 35 mm DIN rail and connects via screw-type terminals, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing. Rated at 10 A maximum, the switch block delivers 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, and 3 A at 400 V. For DC-12/DC-13 duty, it handles 10 A at 24 V, 4.7 A at 60 V, 3 A at 110 V, 1.2 A at 220 V, 0.5 A at 440 V, and 0.26 A at 600 V. The AC-15 rating at 690 V is 1 A.
Lifecycle and Sourcing
This part is a phased-out product. The official successor is the SIRIUS 3RH2 series. For BOM lines specifying the 3RH1911-1GA13-ZW96, the 3RH2 is the direct drop-in replacement from Siemens, sharing the same footprint and auxiliary contact function.
Integration and Mounting
Snap-on mounting onto a 35 mm DIN rail is the standard method, fitting into the same panel space as the base contactor relay. Dimensions are 41.5 mm deep, 36.5 mm wide, and 37.5 mm high, so it adds minimal depth to the assembly. The front face carries an IP20 protection class rating, meaning it is touch-safe but not sealed against moisture or dust ingress — suitable for enclosed control panels only.
Electrical and Mechanical Durability
Mechanical service life is rated at 10,000,000 switching cycles typical. Contact reliability is specified at 1 faulty switching per 100 million operations at 17 V and 1 mA, which covers low-level signal switching in PLC or safety circuit applications. Surge voltage resistance is 6 kV, and insulation voltage is 690 V AC at pollution degree 3. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C.