352 A at 40 °C — the current rating that governs the motor
The 3RW4443-2BC34: It uses thyristor-based switching, which means no mechanical contacts to wear out during starts and stops — the semiconductor handles the inrush, and the soft starter ramps the motor voltage to limit starting current. The inside-delta circuit option allows the soft starter to be wired inside the motor delta connection, reducing the unit current rating needed for a given motor.
Mounting and wiring for a 352 A class build
Mounting is by screw fixing with a vertical mounting surface; the unit can be rotated ±90° or tilted ±22.5° front/back. Dimensions are 230 mm high, 210 mm wide, 298 mm deep — it needs 100 mm clearance above and 75 mm below, plus 5 mm at the sides for airflow. Main circuit connections are busbar, accepting stranded cable 70–240 mm² or finely stranded 50–240 mm². For the auxiliary contacts, solid wire 0.25–1.5 mm² is specified. The wire length from the soft starter to the motor is limited to 500 m maximum.
Protection and control features built in
Motor overload protection is integrated, and the unit has intrinsic device protection. Adjustable current limitation lets you set the start current ceiling as a percentage of the motor FLA — the minimum load is 8%. An external reset input is provided, and a display shows fault signals. The insulation voltage is rated 690 V at pollution degree 3 per IEC 60947-4-2 — this means it's designed for industrial environments with conductive pollution, typical in motor control centres.