The Siemens SIRIUS 3RH2911-2GA40 is a front-mounted auxiliary switch block delivering 4 normally-open (NO) contacts, labelled 53/54, 63/64, 73/74, and 83/84 per EN 50011. It's designed specifically for use with 3RH2140 and 3RH2440 contactor relays — physically coded so it only fits those frames. Rated at 10 A maximum, with a 10 A continuous rating at 24 V. The AC-15 switching capacity at 690 V is 1 A — that's the figure that governs solenoid and contactor coil loads in a control panel. Spring-loaded terminals accept 2x (0.5 to 1.5 mm²) with ferrules, or 2x (0.5 to 2.5 mm²) solid, which covers most panel wiring without needing bootlace ferrules. Snap-on mounting onto the contactor relay — no tools needed for the install, but verify the physical coding matches the relay frame before you push it on.
Switching capacity across voltages
The 3RH2911-2GA40's contact ratings vary significantly with voltage and load type. For DC switching: 6 A at 24 V, 6 A at 125 V, 6 A at 230 V, 6 A at 250 V, but drops to 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, and 3 A at 400 V. For AC-15 inductive loads at 690 V, it's rated 1 A. The 6 kV surge voltage resistance gives it decent margin for transient suppression on the coil side.
The 3RH2911-2GA40 carries a current lifecycle stage per the manufacturer's classification. It's a standard catalog item in the SIRIUS auxiliary switch range, not flagged for phase-out.
Mechanical endurance and contact reliability
Rated for 10 million mechanical switching cycles typical.
Panel integration
Dimensions: 36 mm wide, 41.5 mm high, 47.7 mm deep. Snap-on mounting onto the contactor relay frame — no DIN rail required, it clips directly to the 3RH2140 or 3RH2440. The spring-loaded terminals are physically coded to prevent mis-mating.