The LX4FK040 is a replacement contactor coil from the Schneider Electric TeSys range, designed for DC low-consumption control circuits at 40 V DC nominal. It opens in 45 to 60 ms and closes in 50 to 60 ms, with an average inrush resistance of 1.56 Ω and holding resistance of 391.4 Ω at 68 °F (20 °C). The coil has no built-in suppressor module, so you'll need to add external flyback suppression (a diode or RC snubber) across the coil terminals to protect the DC control circuit from inductive kickback.
Control voltage and operating limits
Rated control voltage is 40 V DC, with operational limits of 0.85 to 1.1 Uc (34 to 44 V DC) and dropout between 0.2 and 0.35 Uc (8 to 14 V DC), all at 131 °F (55 °C).