The Schneider Electric TeSys K LC2K120047M72 is a 4-pole changeover contactor — a reversing contactor preassembled with the reversing power busbar, so it arrives ready to wire into a motor-reversing or source-transfer circuit without sourcing separate interlock kits or bus links. Rated for AC-1 utilisation category (resistive loads), it carries a conventional free-air thermal current Ith of 20 A at 50 Hz, with an average power-circuit impedance of 3 mOhm per pole — heat dissipation is 1.3 W, which matters for enclosure sizing when several contactors sit side by side on a DIN rail.
Rated breaking capacity: 110 A at 440 V, 80 A at 500 V, 70 A at 660-690 V per IEC 60947 — this is the fault-clearing ability, not the continuous rating. Rated insulation voltage Ui is 690 V per IEC 60947-4-1 and 600 V per UL 508 / CSA C22.2 No 14 — the contactor is suitable for 480 V and 600 V class panels, but the UL listing caps the insulation at 600 V. Mechanical durability is 5 million cycles; electrical durability is 300,000 cycles at 20 A AC-1 at Ue ≤ 440 V. The B10d safety reliability figure is 1,369,863 cycles under nominal load per EN/ISO 13849-1 — relevant if this contactor is used in a safety-related stop circuit.
Mounts on plate or rail (DIN rail compatible). Connections are Faston terminals: accepts two 2.8 mm busbar tabs or one 6.35 mm tab per pole. The preassembled reversing busbar means the power wiring between the two contactor halves is already in place — just land the line and load connections. Operating altitude 2000 m without derating; overvoltage category III — standard for fixed-installation distribution panels.
Compliance: designed to BS 5424, VDE 0660, NF C 63-110, and IEC 60947. Flame retardance V1 per UL 94. Protective treatment TC per IEC 60068 and DIN 50016. The contactor carries the relevant certifications for European and North American panel builds.