DIN-rail fit and panel clearances
The 3RH2122-2BB40-ZX95 is a size S00 auxiliary contactor from the Siemens SIRIUS family, measuring 45 mm wide by 73 mm deep by 70 mm high. Clearances are tight but workable: 10 mm needed above, below, and in front of the contactor, 6 mm to the side. On a vertical mounting surface you can rotate the contactor ±180° and tilt it ±22.5° forward or back — handy when you're routing wires around a crowded gland plate. That's enough for daisy-chaining control wiring without a separate terminal block.
Switching capability and coil draw
This is an auxiliary contactor — it handles signal-level switching in control circuits, not motor power. Switching frequency is 10,000 operations per hour on AC loads, with arcing time between 10 and 15 ms.
Environmental tolerance and compliance
Rated for pollution degree 3, meaning it's built for the conductive dust and humidity you find in industrial enclosures — not just clean office environments. RoHS compliance is dated to October 2009 (substance prohibition date), and the minimum relative humidity rating is 10%. The auxiliary switch extension option (product extension auxiliary switch = yes) lets you add contacts without a separate relay.