Should a 12 or 24 volt power supply be used?
Connect 12 volt supplies to 12 volt brakes and clutches. Connect 24 volt supplies to 24 volt brakes and clutches. Always use a 24 volt supply with brake B220. For our smallest brakes and clutches: We prefer to sell the 12 volt version (with a 12 volt power supply), since 24 volt versions of the smaller units require very small gauge wire for the coil.