The Siemens SIRIUS 3RH1911-1HA13-ZW97 is a 4-pole auxiliary switch block with 1 normally open and 3 normally closed contacts, designed for snap-on mounting onto contactor relays and power contactors in the SIRIUS family. It uses screw-type terminals and carries a maximum thermal current rating of 10 A, with a contact reliability of one faulty switching per 100 million operations at 17 V and 1 mA.
Contact Ratings and Switching Capability
This block is rated for switching auxiliary circuits across a wide voltage range: 10 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, 3 A at 400 V, and 0.3 A at 220 V. The AC-15 rating at 690 V is 1 A. These numbers tell you what the contacts can handle in real motor-control logic circuits — the 10 A at 24 V is the highest draw, typical for DC control loads, while the 0.3 A at 220 V shows the drop-off at higher AC voltages.
Lifecycle and Sourcing Reality
The 3RH1911-1HA13-ZW97 is a phased-out product. The official successor is the SIRIUS 3RH2 series. For BOM lines still calling out this specific order code, the part is sourced through independent distribution channels and quoted to order against an RFQ — availability and current pricing are confirmed at quote time. No last-time-buy window remains; this is a surplus/broker-channel part.
Integration and Mounting
Snap-on mounting onto the contactor or relay — no tools needed. The block measures 36.5 mm wide, 41.5 mm deep, and 37.5 mm high. It accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) with core-end processing, or 2x (20 to 16) and 2x (18 to 14) AWG. The front face carries IP20 protection — fine for a closed panel, not for washdown areas.
Electrical and Environmental Ratings
Insulation voltage is 690 V AC at pollution degree 3, with a surge voltage resistance of 6 kV. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Mechanical service life is 10 million switching cycles typical. The block is intended for use with contactor relays and power contactors in the SIRIUS range.