General
The hazards associated with manual internal tap changing of distribution transformers with its Cooper Power™ series 150 A externally operated tap-changer switch because line crews need not be exposed to high voltage conductors and hot transformer fluids.

Tap-changer switches eliminate the need to dismount pole-type transformers for voltage adjustment and exposure of the transformer tank interior to contamination. They are designed for use in distribution transformers filled with transformer oil, Envirotemp™ FR3™ fluid, or an approved equivalent.

Tap-changer switches are available with five or seven switch positions, and for sidewall- or covermounted applications. The switch body, rotor, and shaft are made of a high-strength glass-filled polyester material. The operating shaft is sealed against leakage by two high temperature resistant Viton® O-rings. The tapered gasket seal controls compression and prevents overtightening.

The tap-changer switch is keyed to the tank wall to prevent switch body movement during switching. Switch positions are easily changed by pulling out the spring-loaded handle, turning it to the desired position, and allowing the pointer to drop into the slotted index plate. The pad-lockable operating handle provides greater leverage, can be operated by hand and has a lock screw. The easy to read raised white letters on the black index plate clearly identify switch position.
All copper, low resistance, pinch-type contacts provide self-wiping connections. For ease of connection, bolt tabs, bolt tabs with 1/4-20 stud, 16-14 AWG, 12-10 AWG, 8 AWG or 6 AWG crimp terminals are available. Switches with crimp terminals have additional inboard tapped holes for making separate ring tongue terminal connections without changing switch contacts. All terminals have hex recesses to hold 7/16 inch hex bolt heads of standard 1/4 inch hardware for fast, easy connections.

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