352 A at 40 °C — what that means for your motor circuit
The 3RW4443-2BC35: The 40 °C figure is the standard rating; above that, derate per the temperature curve. Insulation voltage is 690 V, operating frequency 50/60 Hz. It supports inside-delta wiring — that means the soft starter connects in the delta leg of a six-lead motor, reducing the current through each phase by a factor of √3 compared to inline connection. The adjustable current limitation lets you set the start current between 8% and 100% of the rated motor FLA, which is useful for soft starting high-inertia loads without tripping upstream protection. Motor overload protection is built in, along with intrinsic device protection — the unit monitors its own thyristor junction temperature and shuts down before damage. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments with conductive pollution; no additional conformal coating is required for most panel installations.
Mounting, wiring, and panel fit
Dimensions are 230 mm height, 210 mm width, 298 mm depth. Fastening is screw fixing — no DIN-rail clip, so plan for a backplate with drilled holes. Mounting position is flexible: vertical surface with ±90° rotation and ±22.5° tilt front/back. Main current circuit connection is via busbar, with a range of cable sizes: stranded 70–240 mm², finely stranded 50–240 mm², and kcmil 2/0–500. The busbar clamping points accept up to 2x 500 kcmil or a single 250–500 kcmil back clamp. Clearance requirements: 100 mm above, 75 mm below, 5 mm at the sides. Maximum motor cable length is 500 m — beyond that, capacitive charging current may cause nuisance trips. Storage temperature range is -25 to +80 °C; operating ambient max is 60 °C.