The LX4FJ400 is a replacement coil for the TeSys F contactor range, designed for a 400 V DC control circuit. It's a DC low-consumption coil without a built-in suppressor module — meaning you'll need to add an external flyback diode or RC snubber across the coil terminals to protect the control circuit from the inductive kick when de-energizing. Opening time runs 45 to 60 ms, closing 50 to 60 ms. The coil draws 1000 W inrush at 20 °C, then settles to 6 W holding. Average resistance is 236 Ω during inrush and 33750 Ω holding. The closed-circuit inductance is 4435 H — a high value that confirms the coil is designed for a DC supply with significant stored energy. The control voltage limits are: dropout at 0.2 to 0.35 Uc (80 to 140 V DC), operational at 0.85 to 1.1 Uc (340 to 440 V DC) at 55 °C.
The absence of a built-in suppressor module is a critical detail for panel builders. Without external suppression, the coil's high inductance (4435 H) will generate a voltage spike when de-energized that can damage PLC outputs or relay contacts driving it. A standard flyback diode across the coil terminals, cathode to positive, is the minimum protection — verify polarity before wiring. Mechanical durability of 10 million cycles suits applications with frequent switching — think conveyor diverters, packaging machine indexing, or valve actuation in cyclic processes. The 2400 cycles/hour maximum at 55 °C means one operation every 1.5 seconds sustained, which is fast for a contactor coil but within spec for high-speed pick-and-place lines.