The coil picks up at 0.8x rated voltage and holds in at 1.1x, with a DC dropout delay of 15 to 18 ms — a tight window that matters when coordinating undervoltage releases or safety circuits downstream. Mechanical life is rated at 10,000,000 cycles typical, and the contactor is approved for operating frequencies up to 1,000 1/h in AC-1 duty, 750 1/h in AC-2, AC-3, and AC-3e, and 250 1/h in AC-4 — so it handles high-rep applications like conveyor cycling without derating the mechanism.
The 3RT2027-1DB40 accepts solid or stranded conductors from 1 to 10 mm² on the main circuit, and 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) fine-stranded on the coil and auxiliary terminals. Main contact screws are sized for an 8 to 16 mm spanner, typical for S0 frame terminations. The coil uses screw-type terminals, and the built-in auxiliary switch is wired separately — no shared termination block, so the control circuit stays isolated from the load side.
The integrated auxiliary switch is rated for 6 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. At 230 V it carries a 5 hp rating — useful for pilot-duty control of smaller motor starters.