The Siemens SIRIUS 3RH1911-1GA04-ZW98 is a 4-pole auxiliary switch block with 4 NC contacts (44 E per EN 50011), terminated via screw-type terminals. It snap-mounts onto a DIN rail alongside SIRIUS contactor relays and power contactors, sharing the same 36.5 mm width footprint. This block is intended for control-circuit switching — not main power — and its contact reliability is rated at 1 faulty switching per 100 million operations at 17 V, 1 mA, which matters for low-energy PLC inputs where oxide films on dry contacts can cause intermittent opens.
Current ratings by voltage — what they mean for your circuit
This auxiliary block carries a maximum thermal current of 10 A, but the switching capacity varies sharply with voltage and duty. At 24 V DC it switches 6 A; at 60 V DC it drops to 2 A; at 110 V DC it handles 1 A; at 220 V DC only 0.3 A. The AC-15 rating at 690 V is 1 A — that's the inductive load curve for contactor coils and solenoid valves. For resistive loads (AC-12), the 24 V DC rating climbs to 10 A. The takeaway: if you're switching a 24 V DC PLC output to a small relay coil, the 6 A figure gives comfortable headroom; if you're switching a 220 V DC brake solenoid, the 0.3 A limit means you need a larger contact block or an interposing relay.
Lifecycle status — phased out, successor identified
The 3RH1911-1GA04-ZW98 is a phased-out product. The manufacturer lists the SIRIUS 3RH2 series as the official successor. For BOM continuity, the 3RH2 blocks share the same 36.5 mm width and snap-on mounting, but verify the contact configuration and terminal layout against your panel wiring diagram before substituting. This block is available through independent distribution channels, quoted to order against an RFQ — no minimum volume commitment required for a sourcing inquiry.
Integration notes
Snap-on mounting onto 35 mm DIN rail. Depth is 41.5 mm, height 37.5 mm. Screw terminals accept 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. IP20 on the front — protected against finger contact but not against moisture; keep it inside a panel rated IP54 or better. Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Surge voltage resistance is 6 kV, insulation voltage 690 V AC at pollution degree 3.