The Siemens 3RH2911-1FA40-ZX95 is a front-mounted auxiliary switch block from the SIRIUS family, designed specifically for 3RT2 contactors and 3RH2 contactor relays. It provides four normally open (NO) instantaneous contacts in a single compact add-on module that snaps onto the front of the base device without tools. Snap-on mounting onto the contactor or relay face means no additional DIN-rail space is consumed — the block rides with the base device. Panel layout stays unchanged when adding this auxiliary contact set.
Rated at 10 A thermal current (Ith), with AC-15 switching capacity of 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. These are the values that govern whether the contacts hold under repeated inductive load switching — the 400 V / 3 A rating, for instance, is what matters for a 400 V control transformer primary or a valve solenoid on a 400 VAC line. DC switching ratings are also specified: 10 A at 24 V DC, 4.7 A at 60 V DC, 1.2 A at 220 V DC, and 0.26 A at 600 V DC.
Rated for 10 million mechanical switching cycles typical — this is the wear limit before contact replacement is recommended, not a guaranteed minimum. The block is intended for use inside an enclosure that provides the environmental seal.
Screw-type 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 AWG) or 2x (18 to 14 AWG) for solid wire. Strip length and ferrule sizing follow standard Siemens terminal practice — no special tooling required. Dimensions: 36 mm wide, 37.5 mm high, 43.7 mm deep — compact enough to fit in shallow backpanels or behind enclosure doors with limited clearance.