SIRIUS S2 Power Contactor — 3RT1036-3BM40
The Siemens 3RT1036-3BM40 is a SIRIUS S2-size power contactor, screw-type terminals for the main current circuit, designed for motor switching and general load control in industrial panels. It snaps onto 35 mm DIN rail per DIN EN 50022 and can also be screw-mounted, making it a straightforward drop-in for new builds or retrofit work. Rated at 30 kW at 500 V and 11.4 kW at 690 V, this contactor handles a solid range of motor loads. The AC-4 rating of 41 A at 400 V tells you it's built for the tough inching and plugging duty cycles that eat lesser contactors alive — frequent starts, reversals, and counter-current braking. AC-3 maximum switching frequency is 800 operations per hour, so it keeps up with a busy conveyor or pump station without complaint. Coil arcing time runs 10 to 15 ms, with a DC dropout band of 20 to 25 ms — numbers that matter when you're coordinating contactor timing in a safety circuit or sequencing multiple starters. The IP20 front and IP00 terminal rating means it's meant for enclosure mounting, not open-panel washdown areas.
Termination and Wiring
Screw terminals accept solid conductors from 2x (0.25 to 2.5 mm²) and stranded from 2x (0.75 to 25 mm²), with a minimum 16 mm² at 40 °C. That's enough cross-section for the full rated current without derating headaches. Side-by-side mounting is allowed, so you can pack multiple contactors on the same rail for multi-motor groups. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. Pollution degree 3 means it's rated for industrial environments with conductive dust or occasional condensation — typical for a panel in a factory hall.
Lifecycle and Sourcing
Substance prohibitance date of 05/01/2012. No UL or CSA mark is listed in the evidence.