What this reversing starter does
The 3RA2220-1FD24-0AP0 is a Siemens SIRIUS reversing starter in Size S0, built for motor reversing applications — forward/reverse control of a three-phase motor from a single assembly. It ships with the contactor 3RT2024-1AP00, the link module 3RA2921-1AA00, and the busbar adapter 8US1251-5NT10, so it lands as a complete, pre-coordinated unit. Rated at 1500 W at 400 V (AC-3) and 4.8 A at 480 V, it covers small to medium motor loads — think conveyors, fans, or pump reversals in a food-and-beverage or packaging line.
Mounting and panel fit
This starter snaps directly onto 60 mm busbar systems — a common busbar pitch in industrial distribution panels. No extra adapter plate needed. Mounting position is vertical only, and the clearance requirements are: 50 mm upward, 32 mm forward, 10 mm downward, 10 mm at the side, and zero backward. That 155 mm depth and 90 mm width mean it fits a standard 600 mm deep enclosure with room for gland plates and wiring ducts. Operating temperature range is -20 to +60 °C, so it handles warm cabinet interiors near drives or transformers without derating.