The LX4FF100 is a replacement contactor coil for the TeSys F series, rated 125 V DC wide range control circuit. It closes in 30...40 ms and opens in 30...50 ms — fast enough for standard motor starting duty, not a high-speed switching coil. The wide-range control circuit accepts 0.7...1.25 Uc for pickup and drops out between 0.2...0.45 Uc, which gives a clean margin against brownout conditions without a separate undervoltage release.
What else matters for fit
The coil draws 560 W inrush at 20 °C and holds at 4.5 W, with an average resistance of 16.9 Ω inrush and 2340 Ω holding. No built-in suppressor module — you will need an external free-wheel diode or varistor across the coil if the control circuit requires it. Ambient temperature range covers -55 °C to 70 °C, which suits most indoor panel environments but not extended outdoor exposure without a heater.