The LX9FH0422 is a specific contactor coil from the TeSys F range, designed for 42 V AC control circuits at 40...400 Hz. It's the replacement coil for TeSys F contactors that use this low-consumption AC coil platform — not a universal fit, but the exact factory part for that frame. Coil pull-in draws 560...660 VA inrush, then drops to 8...10 VA holding. That's a standard AC magnet coil curve — the inrush surge is brief, but your control transformer needs to handle it without dipping below 0.85 Uc (35.7 V) at 131 °F (55 °C). Drop-out range is 0.35...0.55 Uc (14.7...23.1 V). Opening time is 25 ms, closing 45 ms. That's a solid 1 Hz duty cycle — fine for most conveyor or pump cycling, but not for high-speed pick-and-place.
If you need a drop-in replacement, the closest path is to identify the TeSys F contactor frame this coil served and select the current-production coil variant for that frame at 42 V AC. That's a cross-reference exercise best done with the contactor's full catalog number in hand.
Installation notes
This coil has no built-in suppressor module. On an AC coil, that means you'll want an external RC snubber or varistor across the coil terminals if the contactor is switched by a PLC output or solid-state relay — otherwise the inductive kick can weld relay contacts or damage the driver. Standard practice for TeSys F is a separate surge suppressor in the control cabinet. Average coil resistance is 2.30 Ω inrush and 50 Ω holding at 68 °F (20 °C). Heat dissipation runs 8.4...10.4 W. That's not trivial in a sealed enclosure — account for the thermal load if the contactor cycles continuously near the 3600 cyc/h limit. Ambient operating temperature is -5...55 °C (23...131 °F). The coil is rated for AC control circuits only at 40...400 Hz — do not apply DC voltage or 50/60 Hz-only transformers without verifying the frequency range matches your supply.