Siemens 3RT1045-3AP06 SIRIUS Power Contactor — S3 Frame, 45 kW at 500 V
The Siemens 3RT1045-3AP06 is a SIRIUS power contactor in the S3 frame size, rated for 45 kW at 500 V in AC-3 duty (standard motor switching). That 45 kW figure at 500 V tells you it handles a 3-phase induction motor up to that load — common for medium conveyor drives, pumps, or compressor motors in a 400–500 V line. The contactor uses screw-type terminals on the main circuit, accepts solid wire 2x (0.25 to 2.5 mm²) and stranded 2x (10 to 50 mm²) — so you can land a 50 mm² cable without adapters.
Switching Duty & Mechanical Life
AC-3 switching is the heavy lifting — 1000 operations per hour maximum, which is typical for a contactor this size. AC-4 (reversing / inching) caps at 300 ops/h, and AC-1 (resistive) at 900 ops/h.
Environmental & Installation
Operating temperature range is -25 to +60 °C, storage -55 to +80 °C — so it's fine for unheated enclosures in temperate climates, but derate if you're above 60 °C ambient.