The LC7K12105M7 is a TeSys K contactor from Schneider Electric, a 3-pole (3 NO main poles) control contactor rated for AC-3 duty at 12 A up to 440 V, with one normally-open auxiliary contact and a 220...230 V AC coil. It is now classified as obsolete by the manufacturer.
Motor power and utilisation categories
This contactor covers a range of motor power ratings depending on supply voltage: 3 kW at 220...230 V AC, 5.5 kW at 380...415 V and 440 V, and 4 kW at 480 V, 500...600 V, and 660...690 V, all at 50/60 Hz. The utilisation categories span AC-1 (resistive), AC-3 (squirrel-cage motor starting), and AC-4 (plugging/inching) — so it handles both standard motor starting and more demanding reversing or jogging duty.
Short-time withstand and thermal performance
Rated short-time withstand current (Icw) for the power circuit is 115 A for 1 s, tapering to 55 A for 1 min and 25 A for continuous duty (≥15 min). The signalling circuit holds 110 A for 100 ms. Heat dissipation is 3 W — modest for a contactor this size, meaning it won't significantly heat a tightly packed DIN-rail enclosure. Flame retardance meets V1 per UL 94, plus NF F 16-101 and NF F 16-102 requirements.