The Siemens SIRIUS 3RH1344-1GP00-0KA0-ZX95 is a size S00 auxiliary contactor with four normally-open instantaneous contacts. It's built for control-circuit switching in panels where you need to multiply contact signals from a pilot device or PLC output — think interlocking, status feedback, or enabling a safety circuit downstream. The 10 A rating at 24 V covers most 24 VDC control loads in a modern cabinet; the 6 A at 230 V and 3 A at 400 V handle the AC signal side. Mounting is screw or snap-on onto DIN rail, with the IP20 front keeping fingers out of the live terminals. The full-wave rectifier surge suppressor across the coil means you don't need an external flyback diode for DC switching — one less part on the BOM.
Integration and Wiring
The 45 mm width and 57.5 mm height fit the standard S00 footprint — same envelope as the 3RH2 series contactors, so it drops into an existing panel layout without re-drilling the mounting plate. Depth of 111 mm leaves clearance for wiring ducts behind the DIN rail. The screw terminals accept solid conductors: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm². Mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward. Shock resistance of 10g at 5 ms and 5g at 10 ms covers most machine-mounted applications — not a concern for a fixed panel install. The contact reliability spec — one incorrect switching per 100 million operations at 17 V, 1 mA — means it handles low-level PLC signals without the gold-plating premium.