The 3RT2037-3SF30: It carries an MTBF of 52 years, which for a contactor in continuous industrial service translates to a mean time between failures that comfortably exceeds typical panel overhaul intervals — provided the coil supply and load current stay within the rated envelope. The coil termination uses spring-type terminals, which means no screw-torque check during commissioning — the wire is pushed in and the cage holds it.
The coil rated control supply voltage is 83 to 150 V AC/DC, with an inrush current peak of 25 A. At 50 Hz the holding power is 2 VA; at 60 Hz it is also 2 VA. The pickup and dropout times are 30 to 55 ms for both AC and DC — consistent enough for sequential start logic where interlocking depends on predictable contactor closure delays. The main contactor has an auxiliary switch built in, and the number of auxiliary contacts for the main contacts is configurable from 18 down to 1.