Delta 115/230V AC Surge Arrestor LA-302R

Surges are comprised of two elements: voltage and quantity of charge. A very high voltage surge can damage equipment by breaking down the insulating medium between elements in a circuit or between those elements and a ground. The amount of damage will be determined by the current from the charge and/or current from the power source. In order to protect a circuit from damage, a surge arrestor must conduct sufficient charge from the surge to lower the surge voltage to a safe level quickly enough to prevent circuit insulation from breaking down.

All circuits can withstand a high voltage for a short time. The shorter the time becomes, the higher the tolerable voltage becomes. Consider a fifty thousand volt surge impressed on a two-hundred-forty volt apparatus having a surge arrestor connected parallel. The surge arrestor will begin to conduct the charge, bleeding it out of the circuit. As the charge is removed from the circuit, the surge voltage will fall. As the charge approaches zero the surge voltage will approach zero. If this happens quickly enough the apparatus will be protected.

If you have an off grid system with inverters, these should go near the inverter, on the AC output side. For on grid (with or without solar) they are installed at the service entrance junction box.

Weatherproof Enclosure - DIMENSIONS: 2-1/4" High, 2-1/4" Diameter

Rated Voltage - 250V single phase, 3 wire, residential. 60,000 amps maximum current - 2,000 joules per pole

Unlimited number of surges. No leak current at double the rated voltage. PVC case material, 18" #12 THHN leads.