CIRCUIT BREAKER FOR DIRECT-CURRENT CIRCUIT AND CIRCUIT BREAKER DEVICE FOR DIRECT-CURRENT CIRCUIT

摘要

A plurality of grid plates of a circuit breaker of a DC circuit circuit breaker are provided with a U-shaped notch portion on both sides of the movable contactor and side leg portions on both sides of the notch portion, and a gap is formed between the grid plates Wherein a notch portion of a U-shape facing the U-shaped notch portion of the grid plate is formed on the insulator, and a notch portion side surface of the grid plate at the side foot portion of the grid plate To be exposed. This makes it possible to increase the arc voltage in the small current region in which the arc driving force is small without using the magnets and to block the high-voltage direct current circuit.;