The Siemens 3RH1440-1BF40 is a SIRIUS auxiliary contactor in size S00, carrying 4 normally-open instantaneous contacts and a 110 V DC coil. The 4 NO contacts are rated for switching at various voltages: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V. The mechanical endurance is rated at 5,000,000 operating cycles, and the contact reliability specification states one incorrect switching operation per 100 million operations at 17 V, 1 mA.
The 72 mm depth, 90 mm width, and 57.5 mm height define the panel footprint. Size S00 is the smallest SIRIUS contactor frame, so it fits tightly on a DIN rail alongside other S00 devices without crowding the gland plate. The shock resistance is rated at 10g for 5 ms and 5g for 10 ms, which is adequate for most industrial panels but worth noting for high-vibration environments like crushers or presses. The coil draws 3.2 W closing and holding power at DC, which is a constant load on the control supply. The front protection class is IP20, meaning it is touch-safe but not sealed against moisture or dust ingress. This is standard for enclosed panel mounting; if the contactor sits in a washdown zone, it needs a separate enclosure.
Wiring and compliance notes
The solid-wire connection capacity covers three ranges: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and 2x 4 mm². This covers most control-circuit wiring from signal-level to moderate power feeds. The degree of pollution is rated at 3, which means the contactor is suitable for environments with conductive or dry non-conductive pollution — typical for most industrial control cabinets. The substance prohibition date of 01.07.2006 aligns with RoHS compliance, though no explicit UL or CSA listing is recorded in this evidence.