Very often, the lowest-level circuit breaker does not trip, but the upstream (higher-level) one does! This causes a large-scale power outage! Why does this happen? Today, we’ll discuss this issue.Main Causes of Cascading (Unintended Upstream) Tripping The main circuit breaker’s load capacity is smaller than the total load capacity of all downstream branch breakers. The main breaker is equipped with a residual current device (RCD), while the branch breakers are not. When appliance leakage current
11/07/2025
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