Schneider Electric LA4DB1B Coil Suppressor Module

The Schneider Electric LA4DB1B Coil Suppressor Module is a TeSys D bidirectional peak-limiting diode device that suppresses voltage transients generated by contactor coils in industrial motor control systems. It supports 24 V AC/DC control circuits (Uc) with a maximum peak voltage of 2 × Uc and mounts by screws on the coil terminals A1/A2, compatible with TeSys D LC1D80...D95 contactors. Used to protect PLC outputs, relays, and other sensitive control devices from inductive spikes, it finds application in MCCs, conveyors, pumps, compressors, HVAC systems, and packaging machines, with operating temperatures from −25 °C to +55 °C and storage from −40 °C to +80 °C. The LA4DB1B is discontinued, with Schneider Electric LAD4TB noted as the recommended replacement; common replacements include the Siemens SIRIUS Coil Suppressor Module and Allen-Bradley Bulletin 100-D Coil Suppressor Module.