What It Is and Where It Fits
The Siemens SIRIUS 3RT1036-3BB40-ZN88X95 is a size S2 power contactor with a 24 VDC coil, rated for switching motor loads in industrial control panels. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022, so it drops into any standard panel layout without extra bracketry. The front face carries IP20 protection — safe for finger contact in an enclosed panel — while the terminal area is IP00, meaning the wiring compartment must be inside a cabinet or guarded against accidental touch.
Key Ratings and What They Mean for Your Load
Rated for AC-3 duty at 400 V at 22 kW, this contactor handles typical three-phase induction motor starting and running without welding the main contacts. The AC-4 rating at 400 V at 41 A covers reversing or inching applications where the contacts break full-load current frequently. Mechanical life is 10,000,000 operations typical. The coil draws 10 A at 24 V rated value, with a dropout time of 20 to 25 ms at DC. Pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation — no derating needed in a typical factory floor panel.
Wiring and Integration
Main circuit terminals are screw-type, accepting 2x solid wires from 0.25 to 2.5 mm² or 2x stranded from 0.75 to 25 mm². Side-by-side mounting is supported, so you can gang multiple contactors on the same DIN rail without derating for heat buildup — useful for multi-motor groups in a compact enclosure. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. The storage range is wider because the contactor isn't dissipating coil heat — handling, not running, is what that limit governs.