LA4DFB Schneider TeSys D - interface amplifier module - relay - 24 V DC / 250 V AC

The Schneider Electric LA4DFB is a compact, plug-in relay interface amplifier module engineered specifically for the TeSys Deca (formerly TeSys D) contactor range. This specialized module acts as a critical electrical bridge between low-power electronic control systems—such as PLCs, microcontrollers, or solid-state outputs—and the higher-power operating coils of industrial motor contactors.

Accepting a low-current 24V DC control signal, the LA4DFB amplifies the input to switch up to 250V AC to safely energize the contactor coil. It mounts directly onto the top terminal layout of compatible contactors, eliminating complex panel wiring, minimizing control cabinet space, and providing reliable galvanic isolation between delicate digital logic and noisy power circuits.