2103 A at 40 °C — sizing this soft starter for the motor
The 3RW4466-2BC34: The headline rating is 2103 A at 40 °C ambient, which sets the maximum motor full-load current this unit can start and run through the bypass. Derate to 1864 A at 50 °C and 1680 A at 60 °C — if the panel ambient runs hot, the usable motor size drops accordingly. The operating frequency covers 50 to 60 Hz with a single control supply voltage of 115 V at both frequencies — one transformer covers the control circuit regardless of line frequency. Minimum load is 8 % of the rated current — useful if you're starting an unloaded conveyor or pump with low breakaway torque; the soft starter won't trip on undercurrent during the start ramp.
Integrated bypass — what it saves in the panel
The integrated bypass contactor means you don't add a separate bypass contactor and wire it across the soft starter. That saves a mounting footprint, control wiring, and a coil driver output in the PLC. The bypass carries the full motor current once the start ramp completes, taking the heat off the thyristors. Inside-delta circuit wiring is supported — if the motor has six leads accessible, wiring the soft starter in the delta legs reduces the current the unit sees by a factor of 1.73. That lets a smaller-frame soft starter handle a given motor, but the motor must be six-lead accessible and the starter configured for inside-delta operation. Main circuit connections accept busbar, cable lugs from 70 to 240 mm² stranded or 50 to 240 mm² finely stranded, and 2/0 to 500 kcmil for North American installations. The auxiliary and control circuit terminals are spring-loaded — strip, push, done, no torque driver needed.
Mounting and environment — where this unit fits
Dimensions are 780 mm high by 575 mm wide by 292 mm deep — this is a large-frame soft starter, not a panel-board component. Mounting is screw-fixed to a vertical surface, with ±90° rotation and ±22.5° tilt front-to-back allowed. Plan the enclosure depth to clear the 292 mm plus the 100 mm upward and 75 mm downward clearance for ventilation. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments where conductive dust or occasional condensation occurs — no need for a filtered enclosure in most factory-floor settings. Operating temperature range is 60 °C max during operation, storage from -25 to +80 °C. Maximum motor cable length is 500 m — if the motor is far from the starter, keep the cable run under that limit to avoid reflected-wave voltage spikes that can stress the motor insulation.
Protection and control features
Motor overload protection is built in, along with intrinsic device protection — the soft starter monitors its own thyristor temperature and current, so it can shut down before damaging itself. Adjustable current limitation lets you set the start current between the minimum load threshold and the unit's full rating, useful for limiting inrush on weak supply lines or protecting driven equipment. External reset input is present, and the display shows fault signals — no need to carry a laptop to read the last trip cause. A motor brake output is included as a product component, which simplifies wiring for applications that need a DC injection brake after the stop ramp.