Part overview and key ratings
The Schneider Electric TeSys K LC1K120045L7 is a 4-pole contactor with 4 normally open (4 NO) main poles, rated for 20 A in AC-1 utilisation category (resistive load) at up to 690 V. The control coil is wound for 200-208 V AC at 50/60 Hz, drawing 30 VA inrush and 4.5 VA hold-in at 20 °C. The 4 NO configuration gives you four independent power poles, useful for breaking multiple load circuits simultaneously or for three-phase plus neutral switching.
The contactor is certified to EN/IEC 60947-4-1, GB/T 14048.4, UL 60947-4-1, CSA C22.2 No 60947-4-1, and JIS C8201-4-1. The UL and CSA marks mean it is accepted for panel builds in North America; the IEC listing covers European and global installations. Flame retardance is V1 per UL 94, and the part meets NF F 16-101/102 for rail-vehicle fire behaviour.
Mechanical and electrical margins
Rated breaking capacity reaches 110 A at 440 V, 80 A at 500 V, and 70 A at 660-690 V per IEC 60947 — well above the 20 A continuous rating, giving headroom for fault clearing. The conventional free-air thermal current (Ith) is 20 A at 50 °C, so no derating is needed at typical panel ambient temperatures up to that point. Heat dissipation is only 1.3 W, which is negligible for enclosure thermal budgeting. Mechanical shock tolerance is 10-15 Gn on closed contacts and 6-10 Gn on open contacts per IEC 60068-2-27, with vibration resistance of 4 Gn closed and 2 Gn open across 5-300 Hz. This makes the contactor suitable for installation on machinery or in mobile equipment where moderate vibration is present.
The LC1K120045L7 measures 57 mm deep, 45 mm wide, and 58 mm high.