45 A at 40 °C — what the derating curve means for your motor
The 3RW4036-2BB14: At 50 °C it delivers 42 A, and at 60 °C it drops to 39 A. That 6 A spread between 40 °C and 60 °C means if your panel runs warm — say 50 °C inside a sealed enclosure — you budget for 42 A continuous, not the 45 A nameplate. The integrated bypass contact carries the motor current once the starter reaches full speed. That pulls the thyristors out of the circuit, dropping the heat load inside the enclosure during continuous run. For conveyors or pumps that run hours at a stretch, this matters more than the peak starting current. Control supply is 110-230 VDC — common for 24 VDC panels will need a DC-DC converter or a separate supply rail. The auxiliary and control circuit uses spring-loaded terminals; the main power circuit uses screw-type terminals. That split means the wireman lands the power cables with a screwdriver and the control wiring with push-in, no mixing tools.
S2 frame — panel fit and mounting constraints
The S2 frame measures 55 mm wide × 160 mm high × 170 mm deep. That 170 mm depth is the dimension that eats panel backspace — standard 200 mm deep enclosures leave 30 mm behind the starter for wiring. The solid wire range for control is 2x (0.25-2.5 mm²); stranded power wiring is 2x (1.5-25 mm²). Mounting is screw and snap-on — the DIN rail clip engages the top hat rail, and the screw holes give a secondary fix for vibration environments. Clearances: 60 mm above, 40 mm below, 30 mm at the side.