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circuit breaker transformer maintenance Decomposition Siemens

ETU 25B keeps tripping on 3WL Air circuit breaker ...,I'm looking for electrical schematic of energy transfomer (which is I think really voltage transfomer) installed on 3WL 1220-3CB34-5AM2 Air Circuit Breaker.ETU keeps tripping the breaker as soon as throu the breaker current starts to flow.Resist

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