An isolated DC/DC power adaptor designed to power up your Toughbook devices from a 20-60 VDC power source. The adaptor incorporates the highest degree of circuit protection for your Toughbook and the adaptor itself. The rugged design of this adaptor makes it ideally suited for use in harsh conditions. Efficient power conversion circuits with extensive protection circuitry provide reliable and continuous power in the most demanding environments. Electric forklifts frequently produce negative voltage spikes. The adaptor incorporates special input filtering specifically designed for these electrically noisy power sources.