| 摘要 |
A zero-phase current transformer (102) detects a ground fault current and outputs a zero-phase current. When the voltage of the zero-phase current exceeds a positive side threshold (TH1) or drops below a negative side threshold (TH2), an open collector output circuit (108) operates to discharge a capacitor (104). When the inter-plate voltage of the capacitor (104) drops below a threshold voltage (Vref), a control means (134) detects the fact as earth leakage and notifies the control section (212) of an air conditioner (200) to this effect.
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