The LC1F1854F7: Rated 275 A at <= 440 V in AC-1 utilisation category, so this contactor is sized for resistive loads — heaters, furnaces, lighting banks — where the current waveform is sinusoidal and inrush is minimal. The 4 NO power pole configuration gives four independent normally-open switching paths. The 110 V AC 40-400 Hz control coil pulls in at 0.85 to 1.1 Uc and drops out between 0.2 and 0.55 Uc at 55 °C. Closing time is 35 ms, opening 130 ms at rated control voltage. Rated operational voltage goes up to 690 V AC 50/60 Hz, with an insulation voltage of 1000 V per IEC 60947-4-1. The rated impulse withstand voltage is 8 kV, overvoltage category III. For fault protection, the associated fuse rating is 200 A aM or 315 A gG at <= 440 V. Breaking capacity is 1480 A conforming to IEC 60947-4-1.
Plate-mounted, not DIN-rail — plan for a backplate or sub-panel with bolted connections. Dimensions: 174 mm height, 208.5 mm width, 181 mm depth. Power circuit termination accepts bar connections (25 x 3 mm busbar), ring lugs up to 150 mm², or bolted connections. Control circuit uses screw clamp terminals accepting 1 to 4 mm² flexible or solid wire, with or without ferrules. Tightening torque: 1.2 N·m for control, 18 N·m for power.
Thermal and Environmental
Heat dissipation is 8 to 9.8 W across the assembly, with per-pole dissipation of 12 W in AC-3 and 25 W in AC-1. Average impedance is 0.33 mOhm at Ith 275 A 50 Hz. The protective treatment is TH (tropicalised). IP2X front face with shrouds per IEC 60529.
Certified to IEC 60947-4-1, EN 60947-4-1, IEC 60947-1, EN 60947-1, and JIS C8201-4-1. Maximum operating rate is 2400 cycles per hour at 55 °C.