The LX4FJ030 is a replacement contactor coil from the TeSys range, designed for FJ-frame contactors. It operates on a 30 V DC control circuit with DC low-consumption coil technology, meaning it draws inrush current only during pickup and then switches to a low holding current — a feature that reduces heat buildup in densely packed control panels.
Key electrical characteristics
The coil's operating time is 45 to 60 ms for opening and 50 to 60 ms for closing, which is typical for a contactor of this frame size and suitable for general motor switching and resistive load applications where fast but controlled engagement is needed. Average coil resistance measures 0.842 Ω during inrush and 229.1 Ω during holding at 68 °F (20 °C). The control circuit voltage limits are: dropout at 0.2 to 0.35 Uc (6 to 10.5 V DC) and operational range of 0.85 to 1.1 Uc (25.5 to 33 V DC) at 131 °F (55 °C). This means the coil will reliably pick up above ~25.5 V DC and drop out below ~10.5 V DC — important to verify your control supply stays within these bounds, especially on long cable runs where voltage drop is a factor. The coil comes without a built-in suppressor module, so an external flyback diode or RC snubber must be added across the coil terminals when driven by a PLC or solid-state output to prevent voltage spikes from damaging the driver.
Operating environment and category
Rated for ambient air temperatures from 23 to 131 °F (-5 to 55 °C) during operation, covering most indoor industrial control panel environments. The part is classified under category 18401-WORLD SERVICE PARTS (CTR ACCESS), indicating it is a service/replacement component rather than a new-design item.