What this SIRIUS starter delivers
The 3RA2120-1JA24-0AP6 is a Siemens SIRIUS non-fused motor starter — a direct starter in Size S0, meaning the contactor and overload relay are pre-assembled and wired as a single unit for a motor branch circuit. It ships with the 3RT2024-1AP60 contactor and the 3RA2921-1AA00 link module already matched, so you bolt it in and land your motor leads. The thermal bimetallic overload release gives you Class 10 trip protection — fast enough to protect a standard squirrel-cage rotor on start-up without nuisance tripping.
Mounting and panel fit
Mounting position is vertical only. The footprint is 45 mm wide by 193.1 mm tall by 97.1 mm deep — that 45 mm width is a single modular unit on the rail, so it fits a standard S0-size cutout in a panel layout. Clearance spaces: 30 mm upwards, 10 mm forwards, 10 mm downwards, 9 mm at the side, and 0 mm backwards. That zero-clearance rear face means it can sit flush against a backplate or busbar, saving depth in a tight enclosure.
We source it through authorized industrial distribution channels.