The Model PSR-212 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. Twelve 24 VDC, DPDT relays are pre-mounted and wired to the power supply. The contacts are of silver, gold plated and the contact rating is 3 amps. The coil current is a nominal 35mA. The relays are wired and terminated. The terminals are easily identified by a silkscreened diagram. Any relay may be easily converted to an 'all page' relay by connecting the off bus to the selected relay-switch output. Note: Allows for 11 zones, plus "All Call", or 12 zones without "All Call". Model PSR-212. Is a completely enclosed in a compact 18-gauge CRS chassis finished in black epoxy. It features a 6 ft. power cord. It is designed to be used with Atlas Sound Model MPC Series modular paging communications center.