The compatibility between old D2 Range & TeSys D Range contactor accessories is as below:
1. Instantaneous additive blocks
Mixable on D2 or TeSys D Range.
Mixable on D2 or TeSys D.
3. LA6DK or LAD6K
Not mixable. You must use LA6DK on D2 and LAD6K on Tesys.
4. Thermal overload relay
Not mixable. You must use LR2D on D2 and LRD on TeSys D, because the old LR2D and new LRD have the same setting range but different dimensions.