Panel fit and DIN rail slot count
The 3RT2037-3XB40-0LA2: The 55 mm width on this Size S2 frame means it occupies three standard 18 mm DIN-rail module slots — plan the backpanel layout accordingly when grouping contactors with overload relays and busbars.
Motor switching capacity and coil details
Rated 65 A at 480 V and 52 A at 600 V in AC-3 duty — this is the motor-switching current, not the resistive-heating rating. For a 480 V motor, that covers up to roughly 50 hp continuous; the 600 V figure handles the higher-voltage common in Canadian and some US industrial plants. The DC coil pulls a 3 A inrush peak and holds at the rated 24 VDC.
Timing and environmental envelope
DC dropout delay spans 30–55 ms and arcing time runs 10–20 ms — these matter when coordinating with upstream short-circuit protection or PLC-based drop-out sequences. The 10–20 ms arcing window is typical for DC-switched contactors and sets the minimum off-time before re-energizing. Clearance requirements: 10 mm above/below, 6 mm to the side.