The LX4FK340 is a replacement contactor coil from the Schneider TeSys range, designed for DC control circuits at 340 V DC nominal. It is a service part — category 18401-WORLD SERVICE PARTS(CTR ACCESS) — meaning it was stocked for field replacement of a failed coil in an existing TeSys contactor, not for new builds. Coil technology is DC low consumption without a built-in suppressor module. That matters: if your circuit relies on the coil's own suppression for transient control, you will need to add an external flyback diode or RC snubber across this coil. The average resistance is 89.6 Ohm inrush and 21750 Ohm holding at 68 °F (20 °C), so the inrush current is roughly 3.8 A before the coil drops to its holding current of about 16 mA.
Control voltage limits and operating window
The coil is rated for 340 V DC control voltage, with an operational range of 0.85 to 1.1 Uc at 131 °F (55 °C) — so it will pick up reliably between about 289 V DC and 374 V DC. Drop-out occurs between 0.2 and 0.35 Uc at the same temperature, meaning the contactor drops out between 68 V DC and 119 V DC. This wide dropout band is typical of DC low-consumption coils and means the contactor will not chatter on a sagging DC bus, but it also means the coil will not release until the voltage falls well below nominal. Operating time is 45 to 60 ms for opening and 50 to 60 ms for closing. This is a standard speed for a TeSys contactor coil — fast enough for most motor-starting and general switching duties, but not a high-speed or DC-switching-optimized coil.