Rated current and thermal derating profile
The 3RW4444-2BC34: Insulation voltage is rated 690 V at 50/60 Hz, matching standard 400/480 V motor circuits with headroom for line transients.
Inside-delta wiring and minimum load
Supports inside-delta circuit connection, which reduces the current through the thyristors to 58 % of the line current — useful for retrofitting into existing delta-wound motor starters without upsizing the soft starter. Minimum load is 8 % of the rated current — below that the thyristor firing angle may not hold conduction, so verify the motor no-load current exceeds this threshold.
Integrated protection and fault indication
Built-in motor overload protection and intrinsic device protection (over-temperature, phase imbalance) reduce external relay count; adjustable current limitation lets you set the start ramp ceiling without separate hardware. A display provides fault signal readout on the unit — no separate HMI needed for basic diagnostics.
Panel fit and connection sizing
Dimensions are 230 mm high, 210 mm wide, 298 mm deep — screw fixing to the mounting surface, with ±90° rotation and ±22.5° tilt allowance for tight enclosures. Main current circuit accepts busbar connection or cable: stranded 70–240 mm², finely stranded 50–240 mm², or AWG 2/0–500 kcmil. Auxiliary terminals take solid 0.25–1.5 mm² or AWG 24–16.
Environmental limits and pollution degree
Rated pollution degree 3 per IEC 60947-4-2, meaning it tolerates conductive dust and occasional condensation — suitable for industrial enclosures without climate control.
Current production — the 3RW4444-2BC34 is an active SIRIUS catalog item, not a legacy or phase-out line.