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Switchgear transformer components leakage test electronic weighing device

Earth-leakage circuit breaker with automatic monitoring ...· What is claimed is: 1. Earth-leakage circuit breaker having an automatic monitoring capability and a current summing transformer, a magnetic trip device, and a switchgear having main current contacts for the main leads, wherein the circuit breaker switching value and response time at predetermined time intervals is measured by means of a current-signal generator, a current sensor, a …

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