What This Part Is and What It Does
This Siemens SIRIUS 3RT1036-1DW48-0PA6 is a power contactor in the S2 frame size, designed for switching motor loads in industrial control panels. It carries a 48 VDC coil and is rated for 30 kW at 500 V and 11.4 kW at 690 V, so it handles medium-to-large three-phase induction motors in that voltage band. The screw-type main terminals accept solid wire up to 2x 4 mm² or stranded up to 2x 25 mm², which covers common power wiring for this class. Mounting is screw or snap-on onto 35 mm DIN rail per EN 50022, and side-by-side mounting is allowed without derating for heat buildup between units.
Key Ratings and What They Mean for Your Panel
The AC-3 motor-switching rating of 30 kW at 500 V tells you this contactor can start and stop a standard squirrel-cage induction motor up to that power — the most common duty cycle for conveyor, pump, and fan loads. The AC-4 rating of 41 A at 400 V covers plugging and inching applications where the motor is reversed or jogged under load, which generates higher arcing stress. Maximum switching rates are 800 cycles per hour for AC-3 and 300 for AC-4, so it's not intended for high-speed cycling like a welding gun. Mechanical endurance is rated at 10 million operations typical, which means the contactor itself will outlast most panel rebuilds if the electrical load stays within the curve. The 48 VDC coil pulls in with a typical operating time of 20 to 25 ms and an arcing time of 10 to 15 ms. The coil is rated for continuous duty at 0.8 to 1.1 times the rated voltage, so it holds reliably down to about 38 V and up to 53 V. Pollution degree 3 means it's suited for industrial environments with conductive dust or occasional condensation — standard for most factory-floor panels.
Where It Goes and How It Fits
The S2 frame measures 95 mm wide, 112 mm high, and 130 mm deep — a compact footprint for a 30 kW contactor. It snaps onto standard 35 mm DIN rail per EN 50022, and the screw terminals accept solid wire from 0.5 to 4 mm² or stranded from 0.75 to 25 mm². The front face is IP20, so finger-safe for panel access; the terminal area itself is IP00, meaning live parts are exposed when the panel door is open — standard for enclosed contactors. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C, which covers most indoor industrial environments.