24-volt bells were never popular. Manufacturers only made them because phone system manufacturers didn't use relay contacts rated for traditional ringing voltage (+/- 105 VAC). I can say with certainty that I never installed one in my 30+ years of experience.

You can get 24 volt DC power supplies from the following manufacturers all day to work with slave relays. Any manufacturer's power supply is compatible in this environment.

VALCOM MAKES A BUNCH OF THEM HERE

BOGEN HAS PLENTY TOO


Ed Vaughn, MBSWWYPBX