What is the maximum distance between SC3000 relay pack and SE7300 controller
SC3000 relay pack
Depending on installation and site configuration, the max distance between units may be of interest.
This hasn't been tested, but at least 100 ft (30 m) with 22 GA or bigger wire.
For additional details, also please see:
Knowledge base Article, "Which models of the SE7300 series room controllers can be used with the SC3000 series relay packs?"