The Siemens SIRIUS 3RT1046-1AM20-0UA0 is a Size S3 power contactor rated for motor switching up to 55 kW at 500 V and 25.4 kW at 690 V. It uses screw-type terminals on the main circuit and mounts on a 35 mm or 75 mm DIN rail via screw or snap-on fastening. Mechanical life is rated at 10 million operations typical. Maximum switching frequency varies by duty: 900 cycles/h under AC-1 (resistive), 850 cycles/h under AC-3 (motor starting), and 250 cycles/h under AC-4 (plugging/reversing).
Termination and Wiring
Main circuit terminals accept solid conductors from 0.5 mm² up to 4 mm² (2x per clamp) and stranded conductors from 10 mm² up to 50 mm² (2x per clamp). The auxiliary contact block uses a separate solid-wire range of 0.5 to 4 mm². Degree of pollution is rated 3, meaning the contactor is suited for industrial environments with conductive pollution. The front face carries IP20 protection; the terminal area is IP00, so panel builders should account for clearance and creepage distances inside the enclosure.
Environmental and Mounting
Operating temperature range is -25 to +60 °C; storage range extends from -55 to +80 °C. The contactor occupies 70 mm width × 146 mm height × 139 mm depth on the rail, and side-by-side mounting is permitted without derating.