38 A at 40 °C — the derating curve sets the real limit
The 3RW3028-2BB14: The 40 °C figure is the baseline for sizing against the motor FLA; above that, the continuous current drops by roughly 10% per 10 °C rise. The integrated bypass contact system carries the motor current after start-up, shifting the heat load off the thyristors. This means the derating curve matters most during the start cycle — once bypassed, the thermal limit is the bypass contactor's rating, not the silicon junction.
Spring-loaded terminals and mounting — what ships in the box
Both the main current circuit and the auxiliary/control circuit use spring-loaded terminals. The main terminals accept 16-8 AWG solid or stranded; the auxiliary terminals take 24-14 AWG. No screw torque check needed — the spring cage holds the conductor and signals a seated termination with a tactile click. Mounting is dual-mode: screw-fix or snap-on onto a DIN rail. The 45 mm width fits a standard S0 frame slot. The mounting position allows ±10° rotation and ±10° tilt forward/backward from vertical — useful when the panel layout forces an angled rail.
Clearance, cable length, and pollution class
Keep 60 mm clearance above and 40 mm below the unit, plus 15 mm at the sides, for airflow and wiring access. The maximum motor cable length is 300 m — beyond that, capacitive charging current may cause nuisance tripping on the soft starter's internal protection. The 600 V rated insulation voltage supports 480 V and 575 V line supplies with margin.