What the 1400 A AC-1 rating means for your load
The LC1F1400W7 is a 3-pole contactor from the TeSys F range rated 1400 A in AC-1 utilisation category — that is the conventional free-air thermal current (Ith) at 40 °C, so it handles resistive loads like large heating banks or furnace elements at that full current without derating. The 265...277 V AC control coil draws 2200 VA inrush and 36 VA hold-in at 50/60 Hz; dropout occurs between 0.3 and 0.5 Uc, so a brownout below about 80 V AC releases the main poles cleanly.
Standards and compliance — what the approvals certify
The contactor is certified to IEC 60947-4-1, EN 60947-4-1, UL 60947-4-1, and CSA C22.2 No 60947-4-1 — the core standards for contactors and motor-starters. Rated insulation voltage is 1000 V per IEC/UL 60947-4-1 and 1500 V per VDE 0110 group C. Impulse withstand voltage is 8 kV, overvoltage category III. Protective treatment is TH (tropicalized) for humid environments.
Mounting and integration — plate-mount, not DIN rail
Mounting is plate-only — no DIN-rail adapter. The footprint is 438 mm wide by 332 mm high by 238.6 mm deep. Power connections use a bar with busbar cross-section up to 100 x 5 mm; control wiring is screw-clamp terminals accepting 1 to 4 mm² flexible or solid. Tightening torque on the power circuit is 58 N.m — a substantial bolted joint, not a spring terminal.
Short-time withstand and breaking capacity — fault handling
Rated short-time withstand current (Icw) is 8000 A for 10 s, 6000 A for 30 s, 4500 A for 1 min, 4000 A for 3 min, and 2600 A for 10 min — all at 40 °C. Rated breaking capacity is 2100 A per IEC 60947-4-1. Associated fuse rating is 1600 A gG at ≤ 440 V. These numbers define the contactor's ability to ride through and interrupt fault conditions without welding or arc damage.