Schneider Electric Telemecanique LADT4 Time Delay Block

LADT4 is a TeSys Deca time-delay auxiliary contact block designed to pair with TeSys D contactors and CAD relays, such as LC1D and LC1F, to add timed control in industrial panels. It provides 1 normally open and 1 normally closed contact and operates with an on-delay timing function in the 10–180 s range, enabling delayed signaling or sequencing in control circuits, with contacts rated up to 10 A at 690 V AC. The unit mounts at the front of the assembly and uses screw-clamp terminals for secure wiring, simplifying installation in compact panel layouts. Its three selectable subranges—0.3–3 s, 1–30 s, and 10–180 s—cover a variety of start-up, interlock, and sequencing needs, and it is designed for industrial and HVAC applications, offering a robust timer block within TeSys D systems. In practice, LADT4 is a dedicated time-delay accessory for TeSys Deca, delivering reliable delayed contact signaling in automation circuits and contributing to orderly motor start-ups, interlocks, and safety interlocking schemes.