1 NO + 3 NC Auxiliary Switch Block for SIRIUS Contactors
The Siemens 3RH2911-1GA13-ZW96 is a SIRIUS contactor relay configured as an auxiliary switch block with one normally-open and three normally-closed contacts (1 NO + 3 NC), wired to terminals 53/54, 61/62, 71/72, and 81/82 per EN 50011. Rated for a maximum of 10 A, the switch block carries AC-15 ratings that vary by operating voltage: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, with derated values for DC and higher AC voltages down to 0.26 A at 600 V. Physically coded for use only with SIRIUS contactor relays 3RH2140 and 3RH2440, as noted in the product description, ensuring correct mechanical interlocking and preventing misassembly.
DIN Rail Mounting and Panel Integration
Snap-on mounting to a 35 mm DIN rail per EN 60715, with dimensions of 36 mm width, 43.7 mm depth, and 37.5 mm height — the compact footprint fits standard control panel gland plates and leaves room for adjacent devices. Screw-type terminals accept two conductors per clamp: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) for solid/stranded wire, or 2x (20 to 16 AWG) or 2x (18 to 14 AWG) for AWG cables, with a wire stripping length per standard practice. IP20 protection on the front face means the terminals are touch-safe against finger probes but not sealed against dust ingress — suitable for enclosed panel environments only, not washdown zones.
Electrical Ratings and Contact Reliability
Insulation voltage rated at 690 V AC with degree of pollution 3, and surge voltage resistance of 6 kV — this positions the switch block for 400 V line-to-line control circuits in industrial environments where transient overvoltages are common. Contact reliability specified as one faulty switching per 100 million operations at 17 V and 1 mA, which is critical for low-energy signal circuits where oxide films on silver contacts can cause intermittent opens. Mechanical service life of 10 million operating cycles typical, with the electrical life dependent on the switched load current and voltage per the AC-15/DC-13 curves in the Siemens application manual.
Active Production and Sourcing Reality
The multi-unit packaging (240 units per pack) suits both project builds and stock replenishment.