S2 frame, 55 mm wide — panel fit first
The SIRIUS 3RT2037-1NB30-0CC0 is a size S2 power contactor that measures 55 mm wide, 114 mm tall, and 130 mm deep — the S2 frame is the standard footprint for this current class across the SIRIUS family. Clearance to adjacent devices: 10 mm above and below, 6 mm at the sides — no special derating for side-by-side mounting at those gaps.
Coil and auxiliary contact wiring
Coil operating range is 20...33 V with a 0.8 x initial pickup and 1.1 x full-scale dropout — it pulls a 3 A inrush peak at 24 V, then holds at 2 VA at 50/60 Hz.
Duty-cycle limits — AC-3 at 700 ops/hour
Maximum switching frequency depends on the utilization category: 800 cycles/hour in AC-1 (resistive), 700 in AC-3 (standard motor starting), 400 in AC-2, and 200 in AC-4 (plugging/inching).