VOLTCRAFT FPPS 12-27W-N Mains PSU (fixed voltage) 12 V DC 2.25 A 27 W

StandBy consumption 0.1 W; Output 12 V / DC / 2.25 A; Power 27 Watt; DC barrel connector 5.5 x 2.1 mm (outer / inner Ø)

Price: £ 15.99 from Conrad Electronic