This LADN auxiliary contact block serves as a reliable accessory for AC contactors, equipped with 1 normally open and 1 normally closed contact to extend control capabilities. It enables stable signal transmission for circuit interlocking, indicator monitoring, and PLC feedback in electrical systems. Featuring quick modular installation, it fits most standard AC contactors without extra tools. Constructed with flame‑retardant materials and high‑conductivity contacts, it ensures low resistance and long service life. Widely applied in motor control, power distribution cabinets, and industrial automation equipment, it enhances system safety and operational flexibility effectively