What it is and what it does
The Siemens 3RH1140-1AP00-ZW98 is a SIRIUS auxiliary contactor in size S00, carrying 4 instantaneous normally-open contacts. It is designed to switch control and signaling circuits in motor control centers and industrial panels, extending the auxiliary contact count of a main contactor or providing standalone logic switching. Rated for 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V, it covers a wide range of control voltages common in global installations. The surge voltage resistance of 6 kV ensures it handles transient overvoltages in industrial environments without premature failure. The contact reliability specification — one incorrect switching operation per 100 million operations at 17 V, 1 mA — means it is suitable for low-energy signal switching (e.g., PLC inputs) without the contact oxidation problems that plague general-purpose relays in dry circuits.
Integration and mounting
The 45 mm width and 72 mm depth fit standard DIN-rail enclosures; the screw and snap-on mounting allows quick installation or replacement without tools. The mounting position is flexible: ±180° rotation on a vertical surface, and ±22.5° tilt forward or backward, which helps when fitting into crowded panels or angled subplates. Terminals accept solid conductors from 0.5 mm² up to 4 mm², covering typical control wiring sizes. The IP20 front protection means it is safe for finger contact inside an enclosure but not for direct washdown exposure. Pollution degree 3 rating confirms it is intended for industrial atmospheres with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — standard for most control panels not in clean rooms.
Environmental and mechanical limits
Operating temperature range of -25 to +60 °C covers most indoor industrial settings; storage and transport range of -55 to +80 °C is wider, reflecting the part's resilience during shipping and warehousing. Shock resistance of 10g for 5 ms and 5g for 10 ms means it withstands typical vibration and impact in transport and operation on machinery. The product extension auxiliary switch is available, meaning the base contactor can be fitted with additional contact blocks if more than 4 NO contacts are needed later.
Lifecycle and sourcing
RoHS compliance is confirmed by the substance prohibition date of July 1, 2006, covering the original EU RoHS directive. No REACH or UL listing is stated in the available data, but as a Siemens industrial control product it typically carries CE marking for the European market.