The LX9FH0852 is a specific replacement coil for TeSys F contactors, part of the TeSys range. It's a low-consumption AC coil rated at 85 V AC, 40-400 Hz, designed to swap into the contactor's magnetic assembly when the control voltage needs to match a 85 V AC supply. The coil pulls 560-660 VA inrush at 20 °C, then settles to 8-10 VA holding. That inrush figure matters for the control transformer sizing. Opening time is 25 ms, closing 45 ms. For a contactor coil that's standard speed — fast enough for motor starts, not a high-speed transfer switch.
No built-in suppressor module on this variant. If your application needs coil surge suppression (for PLC output protection or reduced EMI), you'll add an external RC snubber or varistor across the coil terminals.
Control voltage limits and thermal behavior
Operational range is 0.85-1.1 Uc at 55 °C, so the coil holds in from about 72 V to 94 V AC. Drop-out happens between 0.35-0.55 Uc, roughly 30-47 V AC. That's a standard margin — the contactor won't drop out on a brownout that stays above 50 V. Heat dissipation runs 8.4-10.4 W once the coil is sealed in. That's not trivial in a crowded panel — if you're grouping several TeSys F contactors in a small enclosure, factor the combined dissipation into your thermal budget. That's about one operation per second — fine for most motor starting and process control, but not for high-speed counting or rapid cycling.