On June 2, 2020 the spring cage on the ND series dummy functions changed design from a assembled machined spring cage to the new single cast spring cage.
See pictures here : C...
Swapping out the following parts of an ND50 will convert it to an ND53:
Swap N123-028 Push button plunger for N123-017, Push and Turn button plunger
Swap N523-000, Push button for N523-001 Pus...
The E996L is only shipped FS fail safe from the factory but can be converted to FSE fail secure. To convert the 996L to E996L (fail safe or fail secure) follow step 1 of the attached installa...