The SPCP355.300 smart power supply expander (PSU) extends the acre Intrusion system via X-BUS with a monitored 12 VDC local power source for battery management and connected security devices (e.g. expanders), 8 wired zones and 6 fully programmable relay outputs. The PSU comes in a tamper protected metal housing with space for 2 optional 27 Ah batteries and 6 expanders.