Patent ID: 8154839

Claim:
An arrester for electrical power distribution equipment provided for being connected in parallel with a piece of electrical equipment so as to limit overvoltages and shunt or divert over-voltage induced current surges safely around the equipment, thereby protecting the equipment and its internal circuitry from damage, said arrester including at least one elongate outer first housing made of an electrically insulating material, a pair of electrical terminals at opposite ends of the first housing, an array of electrical components arranged in the first housing that form a series path between the terminals, and a voltage grading arrangement comprising an elongated outer second housing, and capacitor circuitry arranged in said outer second housing, said outer second housing is arranged external to said outer first housing, and said outer first housing is arranged as a first arrester module and said outer second housing is arranged as a first grading module, wherein the first arrester module and the first grading module are detachable from each other, so as to provide for adjustment to provide a substantially uniform voltage gradient.