The LX4FJ045 is a replacement contactor coil from the TeSys range, built for FJ frame contactors. It's the part you swap when the coil opens up or the control voltage goes missing — no need to replace the whole contactor if the main poles and arc chambers are still good. This coil runs on 45 V DC, low-consumption type, so it's meant for DC control circuits — not a 24 V or 48 V nominal bus. The drop-out threshold sits between 20% and 35% of Uc at 55 °C, meaning it'll drop the contactor cleanly if the control voltage sags below about 9 to 16 V DC. Operational range is 85% to 110% of Uc at the same temperature, so you've got some headroom on a 48 V supply, but don't push it past 49.5 V.
Timing and coil characteristics — what matters on site
Opening time runs 45 to 60 ms, closing time 50 to 60 ms. That's tight enough for most motor control and interlocking circuits — you're not going to lose a race condition with a PLC scan cycle unless the logic is milliseconds-critical. The coil draws about 1.98 ohms inrush at 20 °C, then settles to 526.1 ohms holding — standard DC economizer behavior, so your power supply sees a big thump on pickup, then a low hold current. No built-in suppressor module on this coil, so you'll want a free-wheeling diode or RC snubber across the coil if you're switching it with a PLC output or solid-state relay; the inductive kickback will fry a transistor output without one. Rated for ambient operation from -5 °C to 55 °C — fine for most indoor panels and mild outdoor enclosures. If the panel sits in a hot machine bay or direct sun, check the derating: the holding resistance climbs with temperature, so at 55 °C the coil might not pull in reliably if the supply voltage is at the low end of the operational range.