196 A at 40 °C — the rating that governs the motor start
The 3RW4434-2BC46: That 196 A figure is the continuous motor current it can handle in standard duty — not the locked-rotor or inrush, but the full-load current of the motor it starts. Derate to 173 A at 50 °C and 152 A at 60 °C — if the panel ambient runs hot, the current ceiling drops accordingly. The 40 °C derating temperature is the baseline; above that, apply the curve. Inside-delta circuit wiring is supported, which reduces the line current by a factor of √3 compared to standard in-line connection — useful for larger motors where the starter current rating can be matched to the phase current rather than line current.
Panel fit and clearance — what the 270 mm depth means for a retrofit
The 3RW4434-2BC46 measures 270 mm deep, 170 mm wide, 200 mm high. For a retrofit into an existing panel, the 270 mm depth is the critical dimension — most standard enclosures have at least 300 mm internal depth, but a shallow backpanel or a door-mounted component can conflict. Clearance requirements: 100 mm upwards, 75 mm downwards, 5 mm at the sides. The 5 mm side clearance is tight — adjacent components can sit close, but the top and bottom ventilation paths must be respected. Main circuit connection accepts stranded wire 25-120 mm² or finely stranded 16-95 mm², plus busbar connection. Auxiliary contacts use solid wire 2x 0.25-1.5 mm². The wire length to the motor can be up to 500 m — adequate for most pump and conveyor layouts.
Protection and control — built-in overload and adjustable current limit
Motor overload protection is integrated — no separate overload relay needed. The minimum load threshold is 8%, meaning it can start lightly loaded motors without nuisance tripping. Adjustable current limitation lets you set the starting current between the motor's no-load and locked-rotor values. Intrinsic device protection safeguards the thyristors against over-temperature and over-current — the soft starter manages its own thermal budget. An external reset input allows remote fault recovery from a PLC or pushbutton. The display version shows fault signals for on-site diagnostics. Pollution degree 3 per IEC 60947-4-2 means it's rated for industrial environments with conductive dust or occasional condensation — standard for most factory-floor panels.