The LX4D8SD is a replacement coil for the TeSys Deca contactor range, wound for a 72 V DC control circuit. It pulls in at 0.75 to 1.2 Uc and drops out between 0.15 and 0.4 Uc.
Sourcing reality — obsolete, not gone
Schneider has marked the LX4D8SD as obsolete.
Electrical and thermal notes
The coil draws 270 to 365 W inrush at 20 °C, then settles to a hold-in power of 2.4 to 5.1 W. Average resistance is 4377 ohms. There is no built-in suppressor module, so you need an external flyback diode or RC snubber across the coil to protect the DC control circuit from the inductive kick when the contactor opens. The closed-circuit inductance is 109.69 H, which governs the release time constant of 25 ms — expect the contactor to drop out about 25 ms after the control signal is removed, relevant for sequencing logic that expects a faster break.