| 摘要 |
The circuit breaker comprises a fixed arm and a fixed contact provided on the fixed arm. A movable arm is adapted to be moved by actuation of a releasing device. A movable contact is provided on the movable arm, disposed to be connectable and disconnected to the fixed contact by operation of the movable arm. An arc extinguishing grid at one end has a notch, formed to have a wide open end and a narrower closed end, for guiding an arc generated by a disconnection between the movable and fixed contacts. An arc plate has one end fixed to the fixed arm, having an arc running surface on which a protrusion is provided. The protrusion has a height that is lower than a contact surface of the fixed contact relative to the arc guiding plate and terminates short of the closed end of the notch.
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