Contactor 3RT7037-1AF00 — SIRIUS S2, 3-Pole, AC Control
The Siemens 3RT7037-1AF00 is a size S2 contactor from the SIRIUS family, with three normally open main contacts and screw-type terminals for both the main and auxiliary circuits.
Ratings and Switching Capacity
At AC-3 duty (motor starting), the contactor is rated for a maximum switching frequency of 800 operations per hour; for AC-4 duty (plugging / inching), that drops to 250 operations per hour — the thermal load of reversing or jogging cycles governs the duty cycle. The coil draws 0.36 A at 50 Hz and 0.38 A at 60 Hz; closing power is 0.79 W DC, holding power 0.36 W DC — the low holding power reduces heat in the panel.
Mounting and Environmental Specs
The contactor measures 55 mm wide, 112 mm high, and 115 mm deep — the S2 frame size fits standard 55 mm-wide DIN rail slots. Shock resistance is 15g for 5 ms and 8g for 10 ms sine pulse.
Protection and Coordination
For Type 1 coordination (contactor may need replacement after a fault), the fuse rating jumps to 160 A. Wire sizes accepted: 2x 0.5 to 1.5 mm² solid/stranded, or 2x 0.75 to 2.5 mm² with ferrules.