The externally operated single phase or three phase tap changers are designed for distribution transformers from 15 kV to 34.5 kV, and with current rates of 100 A, 120 A or 150 A, maximum continuous current. Its terminal studs are made of copper tinned. The copper wire from the coils can be crimped, soldered or screwed on to the studs. The components of the tap changers are compatible with transformer oil, and have proper contact resistance. The body, shaft, nut, nameplate and dust-knob cap are made of a thermoplastic material with high strength, weathers-resistant, UV grade and reinforced with fiberglass. The tap changers are available in several deck-configurations for maximum versatility.
The externally operated three phase tap changer for small and medium power transformers are designed to change the taps of the high voltage coil of the transformer. It can be used in 15, 25 and 34.5 kV voltage class and maximum continuous current of 150 amperes. The support and shaft are made of a fiberglass reinforced material. The bases are made with polyester reinforced with fiberglass and copper or brass tined terminals.