The LAD9V21A is a reversing bar from the TeSys Deca range, designed as a set of connections for mechanically interlocking two 3-pole contactors in a reversing motor starter configuration. It mounts downstream or upstream of the contactors and is built for the LC1D09 through LC1D32 snap-in frame. Rated per EN/IEC 60947-4-1 and GB/T 14048.4, this bar handles the mechanical interlock duty without adding electrical switching — it's the mechanical link that prevents simultaneous closure of the forward and reverse contactors.
Snaps directly onto the contactor assembly — no tools needed for the mechanical link. Storage range extends to -60 to 80 °C, so spares can sit on the shelf in unheated warehouses without issue. Because it's a purely mechanical part, the bar doesn't introduce additional heat or voltage drop into the circuit. The only thing to watch is that the contactor pair you're interlocking is from the same TeSys Deca frame family — the bar's geometry is specific to the LC1D09-32 snap-in footprint.