The LX4FL075: Rated for 75 V DC control voltage with operational limits of 0.85 to 1.1 Uc at 131 °F (55 °C) and drop-out between 0.2 and 0.35 Uc. This means the coil reliably picks up at 63.75 V DC minimum and drops out between 15 V and 26.25 V DC, ensuring clean switching without chatter in the control circuit. Opening time is 40 to 50 ms and closing time is 60 to 70 ms, which suits standard motor starting and disconnection sequences in TeSys F contactors. Mechanical durability is rated at 5 million cycles, reflecting the expected service life under normal switching conditions before mechanical wear-out.
Electrical characteristics and thermal performance
Inrush power consumption is 1600 W at 68 °F (20 °C), dropping to 9 W holding power once the contactor is sealed. The inrush resistance is 8.1 Ohm, rising to 1680 Ohm in the holding state. This high inrush-to-hold ratio is typical for DC-operated contactor coils and must be accounted for in the control transformer sizing. The coil has no built-in suppressor module, so an external flyback diode or RC snubber must be added across the coil terminals to protect the DC control circuit from voltage spikes during de-energization. Inductance of the closed circuit is 180 H, which influences the time constant of the coil circuit and the sizing of any external suppression components. Ambient operating temperature range is 23 to 131 °F (-5 to 55 °C), suitable for standard indoor panel environments without derating.