Part Identity and Key Specs
The LX9FJ927 is a specific contactor coil from the TeSys F range, designed for use with TeSys F contactors. It operates on a 125 V control circuit, accepting both AC (40...400 Hz) and DC low-consumption supply. Coil opening time is 60 ms, closing time is 20 ms — these switching speeds matter for coordinating with upstream protection and PLC scan cycles. Control voltage limits are operational 0.85...1.1 Uc at 131 °F (55 °C), with drop-out at 0.3...0.5 Uc. This means the coil holds in reliably down to about 106 V on a 125 V nominal supply, and drops out cleanly below about 38 V — important for brownout ride-through and predictable de-energization.
Integration Notes for Panel Builders
This coil has no built-in suppressor module, so an external RC snubber or flyback diode must be added across the coil terminals when driven by a PLC output or solid-state relay. Without suppression, the inductive kick from the 2 H closed-circuit inductance can damage switching contacts or cause EMI issues on the control wiring. Heat dissipation runs 11.4...13.9 W during hold-in — enough to raise temperature inside a crowded enclosure. Allow adequate ventilation or derating when mounting multiple coils side-by-side in a panel. Maximum operating rate is 3600 cycles per hour at 158 °F (70 °C). For high-duty applications like rapid cycling conveyors or press controls, verify the duty cycle stays within this limit to avoid coil overheating.