The smart SPCP333 PSU with expander extends the SPC system via the X-BUS with a monitored 12 VDC 2.6 A local power source for connected security devices (e.g. expanders on X-BUS) and battery management‚ 8 wired zones and 2 fully programmable relay outputs. The zones and outputs on the expander function exactly as the zones and outputs on the SPC panel. Each zone can be configured for different zone monitoring requirements. The system supports 4K7 resistors as standard for monitoring but also does support other resistor values. The outputs are volt-free relays that provide both NO and NC terminals allowing the greatest flexibility. The expander features also an X-BUS status LED and on board buzzer for easy device identification and extensive self-diagnostic capabilities.