This is the workhorse of the Unilab Retro range offering continuously variable a.c. up to 15 volts and d.c. up to 20 volts at a combined current of up to 8 amps. This unit is ideal where high power is required such as high-power quartz lamps or for powering simultaneous experiments.The voltage is selected by a large knob on the front panel with dual scale around the outside to indicate a.c. and d.c. voltage setting. It can be locked at a limit by way of an adjustable transparent Perspex disc around the control knob which is secured by a hex socket. An Allen key is provided for the teacher or technician to set the desired locks.The supply offers simultaneous a.c. and d.c. output from dedicated pairs of shrouded 4mm sockets and the shroud can be partially unscrewed for other types of connection such as bare wires.The unit has two in-built layers of protection. The first is a thermal trip on the secondary circuit with a reset button for when the problem load has been disconnected. The second is a 2A mains fuse accessed from the front panel on the primary circuit. Allen key included.Locking mechanism to limit or pre-set the voltage available to students in specific experiments (a standard 3mm Allen/Hex Key is appropriate for locking the voltage if the original is misplaced).4mm output socket/terminalsThermal ""trip"" which can be reset shortly after removal of the excess loadRobustly made with captive mains lead and integral cable wraps on the back panelProtected by a time delay mains fuse in the front panel.Complies to EN61010 2010 certificate available on request.Dimensions: (L)290mm x (W)165mm x (H)165mm.