The non-isolated DC Master models have an electrical connection between the input and output.Features: Low costs. Efficient: low heat generation. Compact. Suited to applications with negative earthing. The isolated DC Master models provide galvanic isolation between input and output circuits.Features: Extra touch-proof. Interference suppression for sensitive equipment. Available with negative or positive grounding. Intelligent DC-DC converters A large benefit of the DC Master models is their two minutes of extra capacity; ideal if you need a short power boost. Complete package All DC Master converters are delivered with mounting bracket, screws and fasteners.