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Voltage type residual current circuit breakers are used in low-voltage power grids where the neutral point of transformers is not grounded. Its characteristic is that when a person is electrocuted, a relatively high voltage appears between the neutral wire and the ground, causing the relay to actuate and the power switch to trip< Current type residual current circuit breakers are mainly used in low-voltage distribution systems with transformer neutral grounding. Its characteristic is that when a person is electrocuted, a leakage current is detected by a zero sequence current transformer, causing the relay to operate and the power switch to disconnect
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