Its headline rating is 700 A at <= 440 V AC in utilisation category AC-3 — that is the current it can make and break under the inductive load of a squirrel-cage motor during starting and running. For a 380-400 V supply, that translates to a motor power rating of 250 kW; at 415 V it covers 280 kW, and at 500 V it reaches 355 kW. The AC-1 rating (resistive load) is not separately stated but the power dissipation per pole at AC-1 is 88 W versus 45 W in AC-3, indicating the thermal headroom for continuous resistive duty. The control circuit is DC standard, with a rated control voltage of 250 V DC. Hold-in power consumption is 6 W at 20 °C; inrush power is 1100 W at the same temperature. The coil operates between 0.85 and 1.1 Uc at 55 °C and drops out between 0.2 and 0.35 Uc — important for verifying that the control supply can deliver the inrush peak without dropping below the dropout threshold. Rated insulation voltage is 1000 V per IEC 60947-4-1, with a higher 1500 V rating per VDE 0110 Group C. The rated breaking capacity is 4000 A conforming to IEC 60947-4-1, which defines the maximum fault current the contactor can safely interrupt. Overvoltage category III means it is suitable for fixed installation in the panel, not for downstream socket-outlet circuits.
This contactor is designed for plate mounting — no DIN-rail clip. The power circuit uses bar connections (2 x 40 x 5 mm) or ring terminals up to 240 mm². Control circuit connections are screw-clamp terminals accepting 1 to 4 mm² flexible or solid wire. Tightening torque for the power circuit is 35 N·m; control circuit is 1.2 N·m.
Standards and environmental
The LC1F500UD is certified to IEC 60947-4-1, EN 60947-4-1, and JIS C8201-4-1. Protective treatment is TH (tropicalised) for humid environments. Storage temperature range is -60 to 80 °C.