The Siemens SIRIUS 3RH1911-1GA31-ZW96 is a 4-pole auxiliary switch block with 3 normally open and 1 normally closed contact, designed for use with contactor relays and power contactors in the SIRIUS family. It mounts via snap-on fastening onto a 35 mm DIN rail, occupying a 36.5 mm wide footprint with a depth of 41.5 mm and height of 37.5 mm, making it suitable for dense panel layouts where space is constrained.
The block carries a maximum continuous current of 10 A, but the actual switching capacity depends on the circuit voltage. At 24 V AC/DC it handles 6 A; at 125 V it also handles 6 A; at 230 V it handles 6 A; at 250 V it handles 6 A. For higher voltages the rating drops: 3 A at 400 V, 0.3 A at 220 V, and 0.26 A at 600 V. These are the make-and-break limits for the auxiliary contacts — important for sizing control circuits, especially when switching inductive loads like contactor coils or solenoid valves at higher voltages.
Wiring and connection details
Connection is via screw-type terminals, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core end processing, or 2x (20 to 16 AWG) or 2x (18 to 14 AWG) for stranded wire. These ratings confirm the block is qualified for installation in standard industrial control panels where overvoltage transients are expected.