The Siemens SIRIUS 3RH1911-1HA13-ZX95 is a 4-pole auxiliary switch block designed for use with contactor relays and power contactors in the SIRIUS family. It provides 1 normally open and 3 normally closed contacts, rated at 10 A at 24 V, and mounts via snap-on to a DIN rail or directly onto a contactor.
Key Ratings and Fit
The auxiliary contacts are rated for AC-15 duty at 690 V at 1 A, and the block carries a surge voltage resistance of 6 kV. The contact reliability specification — one faulty switching per 100 million operations at 17 V, 5 mA — means it is suitable for low-energy signal circuits where oxide buildup on standard contacts can cause intermittent failures. The IP20 front protection is standard for enclosed panel use, not for washdown environments.
Integration Notes
Snap-on mounting to a DIN rail or directly onto a SIRIUS contactor. Screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors with core end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. Mechanical service life is 10 million switching cycles. The 36.5 mm width and 41.5 mm depth fit standard panel layouts.