Power supply unit in BUS with 12VDC 3A output into an enclosure, with transformer and 2 relays. Certified EN50131 Grade 3. For LightSYS™ and ProSYS™ / ProSYS™ Plus main panels. Supervised with 4-wire BUS connection Incorporating battery charger. Supports battery up to 12V / 21Ah. Full supervision of low battery, loss of network power, loop failure and auxiliary output. Incorporates tamper. The circuit and the transformer are supplied into the box. Built-in sounder output (12 VDC / 1.7 A) and overload protection. Dimensions: 110 x 90 x 30 mm. Maximum panel distance: 300 m. Max consumption on the bus: 180 mA.