双电压开关 300A Dual Voltage Switch

Eaton（Cooper）双电压开关 300A Externally Operated Series Multiple (Dual Voltage) Switch

Eaton uses its Cooper Power™ series 300 A externally operated series multiple switch to change connection of de-energized transformer windings between series and parallel to provide different common transformer voltage ratios. They also make it possible to stock one transformer with voltage conversion capability. The switches may be used for 3:1 or lower voltage ratios only. Ratios other than 2:1 or 3:1 may require a backplate. Tri-voltage switches are also available.

Externally operable switches eliminate many of the hazards associated with manual internal tap changing of distribution transformers because line crews need not be exposed to high-voltage conductors and hot transformer fluid. They also eliminate the need to dismount pole-type transformers for voltage adjustment and prevent exposure of the transformer tank interiors to contamination. The switches are designed for use in distribution transformers filled with transformer oil, Envirotemp™ FR3™ fluid or an approved equivalent.

Series multiple switches have pad-lockable, hotstick-operable handles, which provide greater leverage and positive indication of switch position. The switch shaft is made from high strength steel and is sealed against leakage by two high temperature resistant Viton® O-Rings. The switch body and rotor are made of a glass-reinforced polyester. The spring tempered high conductivity copper pinch-type rotor contacts provide dependable self-cleaning action.

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