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circuit breaker distribution transformer tools Siemens

ETU 25B keeps tripping on 3WL Air circuit breaker ... of each energy transformer is 5ohm (same as new breaker), but voltage drop between VT's is less about 1V(when line is powered with 660V) from the breaker on the line which aren't tripping. Voltage drop is about 7V and for working units is about 8.5V.

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