The LX4FK150 is a TeSys FK-series contactor coil rated for 150 V DC control circuits, designed as a low-consumption DC coil without a built-in suppressor module. It's a service part — category 18401-WORLD SERVICE PARTS(CTR ACCESS) — meaning it was stocked for replacement in existing TeSys contactor assemblies, not for new builds. Opening time runs 45 to 60 ms; closing time 50 to 60 ms. The coil draws 18.7 Ω inrush at 68 °F (20 °C) and 4595 Ω holding at the same temperature — the high holding resistance is what makes it a low-consumption design, keeping the coil energized without excessive heat once the contactor is sealed.
Voltage limits and operating window
Control voltage limits are specified at 131 °F (55 °C): drop-out occurs between 0.2 and 0.35 Uc (30 to 52.5 V DC), and the operational range is 0.85 to 1.1 Uc (127.5 to 165 V DC). Ambient air temperature for operation is 23 to 131 °F (-5 to 55 °C).