The 3RA2125-4BE27-0FB4: The magnetic short-circuit release handles the fault interruption. Size S0 footprint: 45 mm wide, 243 mm tall, 107 mm deep. Mounts vertically on 35 mm DIN rail via the snap-on foot or with screws through the mounting slots. Clearance requirements: 50 mm above, 20 mm below, 20 mm at the sides, 20 mm forward — no space needed behind the rail. Spring-loaded terminals on both the main and control circuits — no screw torque to verify, which speeds panel wiring. The supplied contactor is a 3RT2027-2FB40; the supplied circuit-breaker is a 3RV2021-4BA25; the link module is 3RA2921-2AA00. The assembly ships as a coordinated starter set.
Environmental and compliance notes
Operating temperature range is -20 to +60 °C, with storage and transport limits of -50 to +80 °C. Rated surge voltage withstand is 6 kV. Relative humidity during operation: 10 to 95 %. The overload release is temperature-compensated over the operating range.