The LX9FL918 is a specific contactor coil from the TeSys F range, designed as a replacement or spare coil for TeSys F contactors. It operates on a 48 V DC control circuit, with a low-consumption design that draws 48 W holding power at 68 °F (20 °C) and an inrush of 733 W at the same temperature. The coil has no built-in suppressor module, so you'll need to add external suppression if the control circuit demands it.
Control voltage is 48 V DC (also rated for 48 V AC), with operational limits of 0.85 to 1.1 Uc at 131 °F (55 °C) — meaning the coil will pick up reliably as low as 40.8 V DC and as high as 52.8 V DC at that temperature. Drop-out voltage is 0.3 to 0.5 Uc, so the contactor drops out between 14.4 V and 24 V DC. That's a wide dropout band; if your control supply sags, the coil stays pulled in longer than a tighter-band coil would. Opening time is 60 ms, closing time 20 ms. That's typical for a contactor coil in this class — fast enough for motor starting, but not for high-speed cycling applications. Maximum operating rate is 1800 cycles per hour at 158 °F (70 °C), which works out to one operation every two seconds. Mechanical durability is rated at 5 million cycles, so the coil itself isn't the wear item in most installations. Heat dissipation runs 22.8 to 27.8 W. That's the heat the coil dumps into the enclosure.