Schneider Electric (Square D) LADN04 Auxiliary Contact Block TESYS

The Schneider Electric (Square D) LADN04 Auxiliary Contact Block is an electrical switching component to provide additional contact points for compatible motor starters and contactors. It assists in transmitting status and control signals between connected circuits, allowing other system components to respond to operating conditions. Commonly attached to the front of a TESYS contactor assembly, it expands available control connections without altering the primary switching path. In HVAC systems, this contact block supports circuit monitoring, interlocking, and control sequence operations by enabling communication between electrical controls and associated equipment.