The Siemens SIRIUS 3RH1911-1HA13-ZW98 is a 4-pole auxiliary switch block with 1 normally open and 3 normally closed contacts, rated for a maximum of 10 A and designed for use with contactor relays and power contactors in the SIRIUS family. It mounts via snap-on onto a DIN rail, with screw-type terminals accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) conductors, and carries an IP20 protection rating on the front face.
Ratings and what they mean for fit
The 10 A maximum rating applies across the board, but the real-world switching capacity depends on the voltage and duty. At 24 V AC the contacts handle 6 A; at 230 V AC they also carry 6 A. For DC loads, the 24 V DC rating is 10 A, dropping to 4.7 A at 60 V DC, 3 A at 110 V DC, and 1.2 A at 220 V DC. The AC-15 rating at 690 V is 1 A — that's the inductive load curve for solenoid and contactor coils at line voltage. The surge voltage resistance is 6 kV, and the insulation voltage at pollution degree 3 is 690 V AC, so this block is rated for 480 V and 600 V panels without derating the insulation. Mechanical service life is 10 million switching cycles typical, and contact reliability is rated at one faulty switching per 100 million operations at 17 V, 1 mA — a solid figure for low-energy signal circuits.
Integration and mounting
Snap-on mounting onto a 35 mm DIN rail. The block measures 36.5 mm wide, 37.5 mm high, and 41.5 mm deep — it fits the standard SIRIUS contactor footprint and clips directly onto the contactor or relay without extra hardware. Screw terminals accept solid or stranded wire up to 2.5 mm² (or AWG 14) with core-end processing. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C.