Front-mount auxiliary contact block for SIRIUS contactors
The 3RH2911-2XA40-0MA0-ZW96: This is a 4-pole normally-open auxiliary switch block that mounts on the front of Siemens SIRIUS 3RT2 contactors and 3RH2 contactor relays. The spring-loaded terminals accept 2x (0.5 to 2.5 mm²) without ferrule, or 2x (0.5 to 1.5 mm²) with ferrule, saving wiring time versus screw terminals.
Current ratings and switching duty
Rated 10 A maximum, with AC-15 switching at 690 V rated at 1 A — this governs the inductive load capability for contactor coils and solenoid valves. At 24 V the switch handles 6 A, dropping to 0.3 A at 220 V. The AC-15 rating at 690 V is the limiting spec for control-circuit isolation in 400/690 V panels.
Snap-on mounting and panel fit
Snap-on mounting to the contactor front — no tools needed for installation or removal. Dimensions are 36 mm wide, 47.7 mm deep, 41.5 mm high, fitting within the contactor envelope. IP20 front protection means it's touch-safe in enclosed panels but not for washdown environments.
Service life and contact reliability
Mechanical service life is 10 million switching cycles typical. Contact reliability is rated at 1 faulty switching per 100 million operations at 17 V, 1 mA — important for PLC-level signals where dry switching can cause oxide buildup on standard contacts. Insulation voltage is 690 V AC at pollution degree 3, with 6 kV surge voltage resistance.
Sourcing and lifecycle status
Listed as current production — this is an active SIRIUS catalog item. Quoted to order against BOM quantities through independent distribution; availability and pricing confirmed at RFQ. The multi-unit packaging (196 units per pack) suits panel builders running multiple starters on a line.