The Siemens SIRIUS 3RH1344-2AF00-ZN88 is an auxiliary contactor in size S00, carrying four normally-open instantaneous contacts. It's built for control-circuit switching — think signalling, interlocking, and pilot-duty loads inside a panel, not direct motor current. The 45 mm width and 114 mm depth fit the standard S00 footprint; screw and snap-on mounting lets you clip it onto a DIN rail or bolt it to a backplate. Rated 10 A at 24 V and 6 A at 230 V, with a surge voltage resistance of 6 kV — that covers most 24 VDC and 230 VAC control circuits without extra suppression.
Mounting and environmental fit
Mounting position is flexible: the contactor allows ±180° rotation on a vertical surface and can be tilted forward or backward by ±22.5°. That helps when you're squeezing it into a crowded sub-panel. Operating temperature range is -25 to +60 °C; storage and transport go from -55 to +80 °C. Shock resistance is rated at 10g for 5 ms and 5g for 10 ms — enough for most industrial cabinets, but if your line sees repetitive hammering from a press or crusher, check the mounting. Pollution degree 3 means it's rated for conductive environments — typical for control panels not fully sealed.
Contact ratings and switching reliability
The four NO contacts are instantaneous — no leading, lagging, or make-before-break options. That simplifies wiring: all four close and open together. The contact reliability spec is one incorrect switching operation per 100 million operations at 17 V, 1 mA — good for dry-circuit signalling to a PLC input. Mechanical life is typical 10 million operations. For the AC coil, the rated control supply voltage at 50 Hz is 0.8 to 1.1 times the rated value; at 60 Hz it's 0.85 to 1.1. The rated frequency is 50 Hz and 60 Hz — it works on both, but the lower pick-up margin at 50 Hz means a weak supply might drop it out.