Is the SDE adaptor (LV429451) for NSX 100-250 and NSX 400-630 Motor Mech, a spare part?
The SDE adaptor is included with NSX MT100-250 but you can order it separately as well part number LV429451. As for NSX 400-630 the SDE adaptor is not required.
This is an adapter part used with auxiliary contact SDE on Compact NSX 100/160/250 devices. This part is mandatory for control units TM, MA or Micrologic 2 if SDE contact is used.