Fit and function — mounts on 3RH2 contactor relays and 3RT2 contactors
The 3RH2911-1FA40-ZW97: This auxiliary switch block is designed for front mounting on Siemens 3RH2 contactor relays and 3RT2 power contactors, as noted in the product description (with 3RH2). The four normally-open (4 NO) instantaneous contacts provide auxiliary switching for control circuits, status feedback, or interlock logic. Snap-on mounting to DIN rail (EN 60715) means installation takes seconds without tools, consistent with the SIRIUS modular platform. The 36 mm width and 43.7 mm depth fit standard panel layouts.
Switching capacity and contact ratings — AC-15 duty for inductive loads
Rated 10 A maximum at 24 V and 6 A at 230 V in AC-15 duty. These are the switching current limits for inductive loads such as contactor coils, solenoid valves, and small motors. At 400 V the rating drops to 3 A, so confirm the load voltage and category before specifying. Contact reliability is specified as 1 faulty switching per 100 million operations at 17 V, 1 mA — this is the dry-circuit performance floor. Mechanical service life is 10 million switching cycles typical, supporting high-cycle applications like conveyor interlocks or press controls.
Environmental and installation constraints
Operating temperature range is -25 to +60 °C, storage range -55 to +80 °C. IP20 protection on the front means this block is intended for dry, enclosed control panels only — not for washdown or outdoor exposure. Screw-type terminals accept 2x (0.5...1.5 mm²) and 2x (0.75...2.5 mm²) conductors, or 2x (20...16) and 2x (18...14) AWG. Surge voltage resistance is 6 kV, confirming insulation coordination for 400/690 V industrial networks per IEC 60947.
Sourcing and lifecycle — active production, quoted to order
This auxiliary switch is sourced and quoted to order against your BOM quantity.