| 摘要 |
PURPOSE: An air circuit breaker is provided to remove a malfunction of a ground fault prevention device and to reduce a danger of a shock in a ground fault accident by avoiding an introduction of an abnormal electric current and voltage into a neutral line. CONSTITUTION: A movable terminal(MT) and a fixture terminal(FT) on R, S, T lines is spaced away at a contact interval of L1, and a movable terminal(NT) and a fixture terminal(FT) on an N line is spaced away at a contact interval of L2. The contact interval between the movable terminal(MT, NT) and the fixture terminal(FT) on the R, S, T, and N lines is formed to meet a condition of L1>L2. The movable ternimal(NT) carries out a more delayed disconnection operation and a faster connection operation than the movable terminal(MT).
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