What It Is and Where It Fits
The Siemens 3RT1044-1AL20-ZW96 is a SIRIUS power contactor in the S3 frame size, designed for switching motor and resistive loads in industrial control panels. It mounts via screw or snap-on onto 35 mm or 75 mm standard DIN rails, so it integrates directly into a panel's existing rail layout without adapters. The main current circuit uses screw-type terminals, accepting solid conductors up to 4 mm² per clamp and stranded conductors up to 50 mm² — sized for the S3 frame's current range. The front face carries an IP20 rating with the cover or box terminal installed; the terminal area itself is IP00, meaning the panel enclosure must provide the environmental seal.
Key Ratings and What They Mean for Your Panel
This contactor is rated for both 50 Hz and 60 Hz operation, with the rated control supply voltage at 230 V for either frequency. The operating temperature range is -25 °C to +60 °C, with storage from -55 °C to +80 °C — so it handles the thermal conditions inside a closed panel near a motor or drive, as long as the panel ventilation keeps ambient below 60 °C. The mechanical endurance is listed at 10,000,000 operating cycles typical, which is standard for a SIRIUS contactor in this frame class and supports high-cycle applications like conveyor or pump cycling. The degree of pollution rating is 3, which means it's suitable for environments with conductive pollution or dry non-conductive pollution that could become conductive from condensation — typical for industrial panels not in climate-controlled rooms.