What this coil is for
The LX4FF140 is a replacement contactor coil from the TeSys range, designed for DC control circuits at 140 V DC. It's a DC low-consumption coil without a built-in suppressor module, so you'll need to add a free-wheeling diode or varistor externally across the coil terminals to protect the control circuit from the inductive kickback when the contactor drops out.
The coil is rated for 140 V DC nominal control voltage. It operates reliably between 0.85 and 1.1 times Uc at 55 °C, meaning it will pick up cleanly from about 119 V DC up to 154 V DC. Drop-out occurs between 0.15 and 0.2 Uc, so the contactor releases when the control voltage falls to roughly 21–28 V DC. That's a wide hysteresis — useful for ride-through on a sagging DC bus, but it also means the coil won't drop out until the voltage is quite low, so plan your control logic accordingly. Coil resistance is 33.7 ohms inrush and 5453 ohms holding at 20 °C. The inrush current at 140 V DC is about 4.15 A, dropping to roughly 26 mA once the contactor is sealed. That's a standard low-consumption profile — the holding power is under 4 W, so it won't cook the panel, but the inrush pulse needs a power supply that can deliver the peak without drooping. Operating time is 30 to 40 ms closing and 30 to 50 ms opening. That's typical for a TeSys contactor of this frame size — fast enough for most motor starting and general switching, but not a high-speed transfer switch. If you're timing interlocking or sequencing, account for the full 50 ms opening spread.
Deployment context
This coil mounts into the TeSys contactor frame — it's a direct replacement for the original coil in the corresponding contactor.