SIRIUS reversing starter — S0 footprint, Trip Class 10
The Siemens 3RA2220-1JB24-0AP0 is a SIRIUS reversing starter in size S0, designed for standard rail or screw mounting on 35 mm DIN rail via an adapter. Rated for AC-3 duty up to 690 V, with screw-type terminals on the main current circuit. The supplied contactor is a 3RT2024-1AP00 and the link module is 3RA2921-1AA00, so the reversing pair and mechanical interlock come pre-assembled.
Panel fit — dimensions and clearances
The starter measures 120 mm deep, 90 mm wide, and 265 mm tall. Mounting position is vertical. Clearance requirements: 50 mm upwards, 32 mm forwards, 10 mm downwards, 10 mm at the side, and 0 mm backwards — so you can push it against the back panel without extra space.