Siemens 3RF2420-1AC45 Contactor

Siemens 3RF2420-1AC45 is a three-pole solid-state contactor in the SIRIUS 3RF2 family that switches three‑phase AC loads up to 20 A across a 48–600 VAC range. It is powered by a DC control coil in the 4–30 V range and offers a 1200 V blocking voltage between input and output, enabling robust electrical isolation. The device features screw-terminal connections and is suitable for panel or DIN-rail mounting in industrial automation, where motors, pumps, conveyors, and other three‑phase loads require reliable, contactless switching. With zero‑cross switching to minimize EMI and wear on the load, it is rated for ambient temperatures up to 40°C. Siemens part number 3RF2420-1AC45 anchors it within the 3RF2 solid-state relay/contactor lineup, a common choice when a compact, maintenance-friendly solid-state solution is preferred over traditional mechanical contactors in demanding environments.