PSR-212 Zone Page Powered Relay Pack 12 Relays by Atlas Sound is a zone page, powered relay-pak with an internal power supply. The unit is completely wired and ready for mounting. The power supply is capable of delivering 500 mA at 24 VDC. A fuse is used for extra protection. The output of the power supply is terminated at the terminal strip as well as internally to the relay coils. This allows the use of excess power supply capacity for external relays.