Reversing starter for 60 mm busbar panels
The Siemens 3RA2220-4DH27-0AP0 is a SIRIUS reversing starter in size S0, designed to snap onto 60 mm busbar systems — common in motor control centres where space is tight and reversing duty is needed (e.g., conveyor drives, pump direction change).
Dimensions and integration
The unit measures 260 mm high, 90 mm wide, and 165 mm deep — the depth is the critical clearance behind the panel face when mounted on the busbar. Clearance requirements: 50 mm upward, 32 mm forward, 10 mm downward, 10 mm at the side, and 0 mm backward — so the back of the enclosure can be tight against the busbar.
Supplied components and compliance
The reversing starter ships with a 3RT2027-2AP00 contactor and a 3RA2921-2AA00 link module — these are the matched pair for the S0 frame; ordering the starter as a unit avoids mismatched contactor/overload combinations. Operating temperature range -20 to +60 °C; storage and transport range -50 to +80 °C — suitable for most indoor industrial environments without derating.