Schneider Electric TeSys Deca auxiliary contact block, catalogue LADN04, used as an add-on signalling and control accessory for compatible TeSys contactors. It expands auxiliary contact availability without changing the main power contacts. The exact NO/NC arrangement is determined by the LADN variant. It is suitable for interlocking, status indication and control logic in motor starters. The modular TeSys design supports straightforward panel installation. Electrical ratings and terminal arrangement are variant-specific. Key specifications: Family TeSys Deca; device type auxiliary contact; application control/signalling; contact arrangement variant-specific; mounting direct TeSys accessory; electrical rating variant-specific.