The LADT3R1 is a mechanical interlock kit from the TeSys Linergy range, designed to assemble 4-pole changeover contactors using LC1DT20 through DT40 contactors with spring terminals. It provides the mechanical interlock set of power connections — no electrical interlock is included. This kit physically prevents both contactors from closing simultaneously, which is the core requirement for any changeover (reversing or source-transfer) application.
This part is officially obsolete. There is no listed direct successor from Schneider Electric.
The 4-pole (4P) description means this kit handles two contactors, each with four power poles — typical for three-phase plus neutral switching in a changeover scheme. The spring-terminal compatibility (LC1DT20–DT40) tells you the bus-bar pitch and clamping geometry match that specific contactor family; it will not fit screw-terminal or lug-type versions without modification. No electrical interlock is included, so the circuit designer must add any required electrical or logic-level interlocking externally.