The LX4FH140 is a replacement contactor coil from the Schneider Electric TeSys range, designed for FH-series contactors. It operates on a 140 V DC control circuit, with a DC wide-range control circuit type. This is a service part — the coil itself, not a complete contactor — meant for field replacement when the original coil fails on a line. The coil's operating time is 40 to 50 ms for closing and 40 to 65 ms for opening. That timing is within the standard range for a DC-operated contactor of this class; the opening time spread reflects the lack of a built-in suppressor module, which allows the magnetic field to collapse at its natural rate.
Control voltage and coil resistance — what to verify before installation
Rated control circuit voltage is 140 V DC, with an operational range of 0.85 to 1.1 Uc at 131 °F (55 °C). That means the coil will pick up reliably between roughly 119 V DC and 154 V DC at the upper end of its ambient temperature range. Drop-out occurs between 0.15 and 0.2 Uc — so the contactor drops out between 21 V DC and 28 V DC, which gives a clean release margin below the pick-up threshold. Average coil resistance is 25.84 ohms during inrush at 68 °F (20 °C), rising to 5786 ohms in the holding state at the same temperature. That ratio — about 224:1 — is typical for a DC economized coil: the inrush current establishes the magnetic circuit, then the holding current drops to a fraction to reduce heat dissipation. The absence of a built-in suppressor module means the installer must add an external flyback diode or varistor across the coil terminals to protect the DC control circuit from the inductive kick when the contactor opens.
Deployment context — panel integration
The ambient air temperature for operation is 23 to 131 °F (-5 to 55 °C), which covers most indoor industrial panel environments. No special washdown or outdoor sealing applies — this is a standard panel component, not an IP-rated field device.