Wide range of surge & lighting protection products assured you a one stop shopping location for all your need and professional technical support. Electric current travels from point to point because there is a greater surge protection energy on one end of the wire than there is on the other end. This is the same sort of principle that makes water under pressure flow out of a hose -- higher pressure on one end of the hose pushes water toward an area of lower pressure. You can think of voltage as a measure of electrical pressure.When these power peaks occur, it causes the electrical circuit to heat up—kind of like the filament in a light bulb. Fusing must be properly engineered into the photovoltaic surge protection circuit at precise levels. Although a big surge can cause the circuit to blow on the spot, lesser surges can peck away at it, eventually causing it to fail.The models I recieved had the flat angled plug on the end, and personally I think they are a nuisance. Normally I don not review accessories such as this lightning surge protection.Thankfully nobody was around when this occurred or the outcome could have been much worse.but it really makes a huge difference with all the crazy different power adapters I have. Our wide range of products offers specific surge protection levels, voltage/phase configurations, and any mode protection requirement at any panel within your facility.The surge arrester comes with a nice long heavy duty cord. Protecting a facility with this parallel line is an excellent first line of defense in limiting high impulse transients to a level that is acceptable to most electronic equipment. These high-energy surge protection products are placed in parallel with panels that are susceptible to both externally and internally generated transients. A surge protector works by channeling the extra voltage into the outlet's grounding wire, preventing it from flowing through the electronic devices while at the same time allowing the normal voltage to continue along its path.