Schneider Electric LADN40A TeSys Deca 4NO 690 V AC Front-Mount Snap-In Auxiliary Contact Block

The Schneider Electric LADN40A is a TeSys Deca front-mounting auxiliary contact block that clips onto an LC1D or LC1F contactor, or a CAD control relay, adding four normally-open (4NO) contacts without extra panel space. It carries a 690 V AC rated operational voltage (Ue) and a 10 A conventional free-air thermal current (Ith), with NC contacts mirror-certified to IEC 60947-5-1. Snap-in terminals accept 1-4 mm² flexible cable without tools.

Technical Specifications

Certifications & Standards

• CE
• UKCA
• cULus
• CCC
• IEC 60947-5-1
• UL 60947-5-1

Selection Notes

Pick the LADN40A when the control scheme needs four normally-open (4NO) signals added to an existing TeSys Deca contactor or CAD relay — typically for status fan-out circuits that need four independent make contacts from one contactor. Every block in this front-mount family shares the same 10 A Ith and 690 V AC Ue, so the only real selection criterion between siblings is contact arrangement, not rating; pick the NO/NC mix that matches the wiring diagram rather than over-ordering a higher pole count.