Form factor and panel fit — S0 reversing starter on DIN rail
The 3RA2225-1CB23-0AP6 is a non-fused reversing motor starter from the Siemens SIRIUS 3RA2 series, size S0. It snaps onto 35 mm standard DIN rail in vertical orientation — no mounting plate needed, just rail space. At 120 mm deep, 90 mm wide, and 265 mm tall, it fits a standard S0 footprint. Clearance around the unit: 30 mm upward, 10 mm forward, 9 mm to the side, zero backward — plan your gland plate and busbar routing accordingly.
Motor ratings and trip class — what the numbers mean for a reversing duty
At 400 V it's rated 750 W; at 500 V, 1 100 W. That's the standard for standard-duty motor starting; if your application has long acceleration times (centrifuges, high-inertia fans), you'd want Class 20 or higher. Wire range for main contacts: 1 to 10 mm² stranded, or 2× 2.5 to 6 mm² — covers most motor feeder cables up to the S0 frame rating.
Supplied components and what's inside the assembly
This reversing starter ships as a pre-assembled unit containing the contactor 3RT2023-1AP60 and the link module 3RA2921-1AA00. The circuit-breaker size is S00, integrated into the assembly for coordinated short-circuit and overload protection. The design is a reversing starter — two contactors mechanically interlocked for forward/reverse motor control, plus the overload relay. No external interlocking wiring needed; it's built into the link module.
Environmental limits and compliance
Operates from -20 to +60 °C, stores from -50 to +80 °C, and survives transport from -55 to +80 °C. Pollution degree 3 — suitable for industrial environments with conductive dust or occasional condensation. Substance prohibitance date is 03/01/2017 — the starter complies with RoHS and REACH substance restrictions as of that date.