What the 3RH1131-1AR00 Is and What the Ratings Mean
The Siemens 3RH1131-1AR00 is a SIRIUS auxiliary contactor in size S00, carrying three normally-open instantaneous contacts (and zero NC, zero delayed, zero lagging, zero make-before-break). Its main job is to mirror the main contactor's position — either as a feedback signal to a PLC or to switch lower-current control loads in the panel. The headline rating is 10 A at 24 V (AC or DC, the listing doesn't distinguish — treat it as the maximum resistive current per contact at that voltage). At 110 V it drops to 1 A, at 230 V to 6 A, and at 400 V to 3 A. The 6 kV surge voltage rating means it can handle the transient spikes typical on 400 V industrial lines without flashover. Contact reliability is specified as one incorrect switching operation per 100 million cycles at 17 V / 1 mA — meaning it's trustworthy even at the dry-circuit end of signal switching, not just power contacts.
Panel and Mounting
Mounts via screw and snap-on to DIN rail. The 45 mm width and 57.5 mm height fit the S00 footprint; depth is 72 mm, which is standard for this frame size. Mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt — useful if the panel layout forces an unconventional orientation. Terminal capacity accepts 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², and 2x 4 mm² — covers most control wiring sizes. IP20 on the front means it's protected against finger contact, suitable for enclosed panels only.
Environmental and Lifecycle
Operates from -25 to +60 °C; storage and transport range is -55 to +80 °C. Shock resistance is 10g / 5 ms and 5g / 10 ms. Pollution degree 3 means it's rated for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation.