Reversing starter — what it does and where it fits
The 3RA6250-1EB34: This is a SIRIUS compact reversing starter — a single device that combines a contactor-based reversing motor starter with an adjustable overload relay in a 170 mm x 90 mm x 165 mm footprint. It switches a three-phase motor in both forward and reverse directions and protects it against overload and phase loss.
Trip class and overload protection — adjustable for the load
The overload relay is adjustable between Class 10 and Class 20 trip curves. Class 10 suits fast-heating loads like submersible pumps or compressors that must trip quickly on stall; Class 20 gives more starting time for high-inertia loads like fans or centrifuges. Set it per the motor's acceleration time. The coil accepts 24 V AC or DC — universal control voltage that simplifies panel wiring when a single 24 VDC supply powers both the PLC and the motor controls.
Mounting and wiring — DIN rail, screw terminals, wire ranges
Mounts on standard 35 mm DIN rail via the screw-and-snap-on fastening method. No special tools beyond a screwdriver. Operating temperature range is -20 to +60 °C, storage and transport -55 to +80 °C. Pollution degree 3 means it is rated for the conductive-dust and humidity conditions typical in industrial control panels. Power dissipation is 3.5 W max on AC and 3.1 W max on DC — minimal heat load inside the enclosure, so no special ventilation is needed for a single unit.
Shock and vibration — rated for machine-mounted service
Withstands 6g shock (60 m/s²) for 10 ms, three shocks per axis, and vibration of 20 m/s² from 5.8 to 500 Hz. This qualifies it for direct mounting on machinery or conveyors without a separate isolation panel. Three LEDs on the front indicate status — typically run, overload trip, and fault. No IO-Link or AS-Interface onboard; this is a hardwired starter for conventional control.