Resistors are designed to meet requirements of both A.C. & D.C. applications. The basic types of resistors are stainless steel (Grade - 304) and punched steel resistors. These are manufactured for current rating from 10 to 800 Amps. Continuous resistors of higher ratings are manufactured using 2 or more parallel paths. Resistors with short time rating up to 3000 Amps or even more for neutral earthling are possible which suitable for system voltage up to 11 KV and above.