Physical footprint and panel fit
The 3RW4466-6BC34 measures 780 mm high by 575 mm wide by 292 mm deep — a substantial cabinet footprint that demands a dedicated backplate section, not a DIN-rail clip. Clearance zones are specified: 100 mm above, 75 mm below, and just 5 mm at the sides. The top clearance is the critical dimension for hot air exhaust from the thyristor stack — skimping on that 100 mm ceiling drives the unit into early thermal derating.
Current ratings and thermal derating profile
The 40 °C figure is the catalog rating; if the panel ambient runs hotter — common in a packed MCC lineup — the 60 °C derating to 1680 A is the number to size the motor branch circuit against. The derating temperature floor is 40 °C, meaning the full 2103 A is available only when the cooling air entering the unit stays at or below that point. Above 40 °C, the thyristor junction temperature limits the continuous current per the published steps.
Power and control wiring terminals
Main circuit connection is via busbar, with the cable terminal range accepting stranded 70–240 mm² and finely stranded 50–240 mm², plus AWG 2/0–500 kcmil for the main contacts. That covers everything from 2/0 feeder to 500 kcmil for the high-current path — no adapter lugs needed for the common industrial sizes.
Protection and control features built in
Motor overload protection, intrinsic device protection (thyristor overtemperature, phase imbalance), and adjustable current limitation are all integrated — no separate overload relay needed in the branch circuit. The minimum load is 8 % of the rated current, so it handles lightly loaded motors without dropping out. An integrated bypass contact system means the thyristors are shorted out once the motor reaches full speed, eliminating continuous conduction losses in the power semiconductors. The unit also includes a motor brake output and an external reset input for remote fault clearing.
Environmental and compliance ratings
Pollution degree 3 per IEC 60947-4-2 — suitable for industrial environments with conductive dust or occasional condensation. Insulation voltage rated 690 V, operating frequency 50–60 Hz. Storage temperature range -25 to +80 °C, with a 60 °C maximum during operation. The maximum motor cable length is 500 m — sufficient for most distributed motor installations without output reactors, though longer runs may require a dv/dt filter depending on the cable capacitance and the thyristor switching edge.