DELTA is a company located in Spring, Texas that specializes in surge arrestors. The DELTA silicon oxide varistor (SOV) arrestor is an improvement on the conventional valve type arrestors. Valve arrestors utilizes a spark gap for the lightning to arc over and a series resistor, which is intended to limit the flow of follow current from the line. The DELTA SOV arrestor is a pair of metal electrodes separated by a silicon oxide compound. Under normal conditions, the silicon oxide is a good insulator so that no line current flows between the electrodes to ground. When an excessively high voltage occurs on the electrodes, the high energy electrical field ionizes the silicon oxide, changing it from a compound to silicon, separate from oxygen. Since the silicon ion is a good conductor, the high energy current is conducted to ground. When the voltage falls toward normal, the silicon and oxygen recombine, forming silicon oxide and shutting off the conduction. The reason the DELTA SOV arrestor is so much for effective, is that there is no series resistor to limit the flow of current. In valve arrestors, the resistor is there to limit the flow of the line current, but it also impedes the lightning discharge. Since the DELTA SOV arrestor needs no resistor, it can conduct more current much faster. RSP Supply is a proud distributor of DELTA AC and DC lightning arrestors.

DELTA lightning arrestors are designed to absorb voltage spikes caused by lightning, allowing the surge to bypass wiring and equipment. They are connected to wires just before they enter any part of the solar system. See our full line of DELTA Lightning Arrestors here: