The 3RW4434-2BC35: The 690 V insulation voltage per IEC 60947-4-2 means it handles 400 V and 480 V systems with headroom — the pollution degree 3 rating confirms it tolerates conductive dust and condensation typical in industrial panels without requiring conformal coating on the power board. The inside-delta circuit connects the thyristors in the motor delta legs rather than the supply lines, reducing the current each thyristor carries by roughly 58 % compared to a standard in-line soft starter. This means the 196 A unit can start a motor with a nominal FLA up to about 340 A when wired inside-delta — a key spec for a panel builder sizing the starter to the motor nameplate, not the line current.
Mounting and wiring — what ships in the carton
Screw fixing with a vertical mounting surface that is rotatable ±90° and tiltable ±22.5° front-to-back — the unit fits into a panel without a dedicated mounting bracket. Dimensions are 200 mm high, 170 mm wide, 270 mm deep. The main circuit connection accepts busbar or cable: stranded 25–120 mm², finely stranded 16–95 mm², or 4–250 kcmil. Auxiliary contacts take 2× (24–16) AWG and solid 2× (0.25–1.5 mm²). The kit is complete — no missing gland plates or adapter rails. Clearance distances: 100 mm upward, 75 mm downward, 5 mm at the side. The maximum motor cable length is 500 m — long enough for most pump and conveyor runs without adding output reactors.
Protection and control — what the soft starter handles internally
Built-in motor overload protection and intrinsic device protection mean the 3RW4434-2BC35 does not require a separate overload relay in most installations — the soft starter monitors motor current and trips on overload. Adjustable current limitation sets the starting current between 0 and the rated current, protecting both the motor and the supply transformer during acceleration. Minimum load is 8 % of the rated current — it will not drop out on lightly loaded motors. External reset allows a remote pushbutton or PLC output to clear a fault without opening the panel. A display version for fault signal shows the trip cause locally.