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Used for circuit leakage protection alarm, such as residual leakage circuit breaker, leakage protection switch (RCCB, RCBO), etc.; Epoxy resin potting can be used in harsh environments; Working frequency: 50Hz/60Hz; Primary and secondary power frequency withstand voltage 4KV/Min, insulation resistance ≥1000MΩ/500Vdc; Working temperature range: -20℃～60℃;