The LX9FJ938 is a specific contactor coil from the TeSys F range, designed as a replacement or spare coil for TeSys F contactors. It's a drop-in component — not a standalone contactor — so the buyer is typically an MRO planner or panel builder replacing a failed coil or stocking a spare for a critical motor starter. Rated for 460 V AC and 460 V DC control circuits, this coil handles both supply types without modification. The control circuit voltage limits are 0.85 to 1.1 Uc for operation at 131 °F (55 °C), and dropout occurs between 0.3 and 0.5 Uc under the same conditions — meaning it holds in reliably down to about 391 V AC/DC and drops out cleanly between 138 and 230 V. Opening time is 60 ms, closing time 20 ms. That 3:1 ratio matters for sequencing: the coil opens slower than it closes, so in a reversing or interlock circuit the break-before-make timing is built in. Maximum operating rate is 3600 cycles per hour at 158 °F (70 °C), which works out to one operation every second — fine for most conveyor or pump cycling, not for high-speed indexing.
Electrical and thermal characteristics
Inrush power is 430 W at 68 °F (20 °C), dropping to 22 W holding power once the contactor seals. The average resistance shifts from 478 Ω inrush to 4380 Ω holding — that's nearly a 10× ratio, which keeps the coil cool in continuous duty. Heat dissipation runs 11.4 to 13.9 W, so in a densely packed panel, account for that thermal load when sizing the enclosure ventilation. Inductance of the closed circuit is 23 H, which is high enough that the coil current is largely resistive at 50/60 Hz AC. No built-in suppressor module is included, so if the contactor drives inductive loads or the control circuit uses a PLC output, add an external RC snubber or free-wheeling diode across the coil terminals to protect the switching device from the back-EMF spike on dropout. The control circuit accepts AC 40 to 400 Hz and DC low consumption — the low-consumption DC variant draws less holding current than standard DC coils, which matters when the control supply is a 24 V DC bus with limited current capacity (though this coil is 460 V, the principle applies). Ambient operating temperature range is 23 to 131 °F (-5 to 55 °C), covering most indoor panel environments.
Because it's a specific coil for the TeSys F range, there's no direct pin-compatible substitute from another manufacturer — the mounting pattern, armature travel, and electrical interface are proprietary to TeSys F contactors. If you're replacing a coil in an existing TeSys F contactor, this is the correct part. For a new design, verify the contactor frame size matches this coil's voltage and power class.