This refers to how many times they change the units to upgrade their tooling process. It will make the parts more stable and work better in different applications. And the older parts are no longer available, nor can they be used as service parts.

On the EDC, HDC and MDC controls they are not interchangeable due to the length of the pins.

Housing – all frame sizes have been increased in thickness on the side cover

End caps – all frame sizes have been increased to match up with the housing sizes

Controls – don’t have a need for mounting plate, three pin link change

Side Cover – have been changed to match up with the increases to the housing, end caps and controls.

If you need further information on this call us at 800-361-0068

sales@htsrepair.com