The LX1FF026 is a replacement coil for TeSys F contactors, wound for 26 V AC at 50 Hz. That 26 V is the control voltage — not the main power — so it pulls in the contactor armature when the control circuit energises it. The coil draws 550 VA inrush at 50 Hz (cos φ 0.3) and holds at 45 VA, which tells you the control transformer needs to be sized for the inrush peak, not the sealed VA. Heat dissipation runs 12 to 16 W at 50 Hz; that's the thermal load the enclosure has to shed if the contactor is cycled hard. The coil has no built-in suppressor module, so you'll need to add a flyback diode or RC snubber across the coil terminals if the control circuit drives inductive loads or a PLC output. Without it, the inductive kick when the coil de-energises can couple noise into nearby signal wiring — check the shield first if you see phantom faults on a sensor line sharing the same panel.
Voltage tolerance and timing
The coil picks up reliably between 85% and 110% of Uc (22.1 V to 28.6 V) and drops out between 35% and 55% (9.1 V to 14.3 V) at 55 °C. That dropout margin is wide enough that a sagging 24 V control bus won't cause nuisance dropouts — the coil stays sealed until the bus dips below about 9 V. Closing time is 23 to 35 ms; opening is 5 to 15 ms, fast enough for most motor-starting and interlocking sequences.