232 A at 40 °C — the thermal derating drives the motor match
The 3RW4435-6BC34: That derating curve is the first check against your motor FLA and enclosure ambient — a panel that runs at 50 °C knocks 29 A off the headline figure. Insulation voltage is 690 V, so it sits comfortably on 400/480 V systems with headroom. Operating frequency covers 50 to 60 Hz — one part number for global installs. Inside-delta circuit wiring is supported, which reduces the line current by about 42% compared to a standard in-line connection — useful when the motor is wired in delta and you want a smaller soft starter frame.
Terminal ranges and what fits in the box
Main circuit terminals accept stranded 25–120 mm² or finely stranded 16–95 mm², plus 4–250 kcmil for North American builds. The busbar connection option is listed for the main current circuit — no lug crimping needed if the panel uses bus. The clamping points are screw-type, with front and back options accepting 6–2/0 AWG each. Maximum motor cable length is 500 m — long enough for most conveyor and pump runs without a output reactor, but check the cable capacitance against the thyristor dv/dt if you push that limit.
Panel fit and mounting flexibility
Dimensions are 170 mm wide, 200 mm high, 270 mm deep — screw fixing to the mounting surface. Clearance above is 100 mm, below 75 mm, and 5 mm at the sides for airflow and wiring access. Mounting position allows vertical surface with ±90° rotation and ±22.5° tilt front-to-back — flexibility for tight enclosures or angled backplates.
Protection and diagnostics built in
Motor overload protection is integrated — no separate overload relay needed for the soft starter branch. Adjustable current limitation lets you set the start current between 8% and 100% of the rated current. Intrinsic device protection covers the thyristors against overtemperature and phase loss. External reset input allows remote clearing of faults from a PLC or pushbutton station. A local display shows fault signals — no need to wire a separate HMI for basic diagnostics on the line.
The 3RW4435-6BC34 is a SIRIUS series soft starter, the standard industrial line from Siemens for motor starting applications. Compliance documentation includes IEC 60947-4-2 for the soft starter standard, pollution degree 3 rating, and the usual Siemens declarations (CE, UKCA, EAC) — these are provided with the shipment or on request.