The LX9FL914 is a specific contactor coil for the TeSys F range, designed to replace or populate the coil assembly on F-frame contactors. It operates on a 30–33 V DC control circuit, with low-consumption hold-in rated at 48 W at 68 °F (20 °C) and an inrush of 733 W at the same temperature — the inrush figure matters for sizing the control transformer or DC supply, since the coil draws that peak only during the closing transient. Opening time is 60 ms, closing time 20 ms, which is typical for a DC-operated coil of this frame size and means the contactor responds fast enough for most motor-start and isolation duties without nuisance timing issues. Mechanical durability is rated at 5 Mcycles, and the maximum operating rate is 1800 cycles per hour at 158 °F (70 °C) — so it can handle frequent cycling in applications like conveyor indexing or compressor control, as long as the ambient stays within the -5 to 55 °C operating range.
Control voltage and coil technology
The coil accepts AC 40–400 Hz or DC low-consumption control circuits, but the specified voltage is 30–33 V DC. The operational limits are 0.85–1.1 Uc at 131 °F (55 °C), and drop-out occurs between 0.3 and 0.5 Uc — so the coil holds in reliably down to about 25.5 V and drops out cleanly below about 10 V, which gives good noise immunity on a 24 V DC bus with a boost regulator. The coil is supplied without a built-in suppressor module, so you need to add an external flyback diode or RC snubber across the coil terminals if driving it from a PLC output or solid-state relay — otherwise the inductive kick can damage the driver.
Thermal management
Heat dissipation ranges from 22.8 to 27.8 W depending on coil state and ambient. That's not trivial in a crowded panel — plan for that thermal load when spacing the contactor next to other heat sources or in a sealed enclosure.