LADN04 is a Schneider Electric add-on auxiliary contact block for TeSys D and TeSys F contactors. Front mounting block, it provides 4NC instantaneous contacts rated up to 10A 690V AC. It can be used in safety applications. LADN04 is a Schneider Electric add-on auxiliary contact block for TeSys D and TeSys F contactors. It provides 4NC instantaneous contacts rated up to 10A 690V AC. It can be used in safety applications thanks to its NC certified mirror contacts.