三菱 微型断路器；BH-D6 3P 32A TYPE D N (CH)
⑴ 断路器与断路器的配合应考虑上级断路器的瞬时脱扣器动作值，应大于下级断路器出线端处大预期短路电流，若由于两级断路器处短路时回路元件阻抗值差别小，使之短路电流值差别不大，则上级断路器可选择带短延时的脱扣器。
(1) the coordination of the circuit breaker and the circuit breaker should consider the action value of the instantaneous tripping device of the superior circuit breaker. It should be greater than the maximum expected short circuit current at the end of the lower circuit breaker. If the circuit element impedance value of the two stage circuit breaker is short, the short circuit current value is not very different, then the superior circuit breaker may choose to take the short delay. Release。
⑵ 限流断路器在短路电流大于或等于其瞬时脱扣器整定值时，将会在数毫秒内脱扣，故下级保护电器不宜用断路器实现选择性保护要求。
(2) the current limiting circuit breaker will be released within a few milliseconds when the short-circuit current is greater than or equal to the setting value of its instantaneous tripping device. Therefore, the lower level protective appliances should not use the circuit breaker to realize the selective protection requirements.
⑶ 具有短延时的断路器，当其时限整定在大延时时，其通断能力下降，因此，在选择性保护回路中，考虑选择断路器的短延时通断能力应满足要求。
(3) the short delay circuit breaker, when the time limit is set at the maximum time delay, its breaking capacity decreases. Therefore, in the selective protection loop, the short delay breaking capacity of the circuit breaker should be considered to meet the requirements.
⑷ 还应考虑上级断路器的短路延时可返回特性与下级断路器的动作特性时间曲线不应相交，短延时特性曲线与瞬时特性曲线间不应相交。
Besides, the short circuit time delay can not intersect with the action characteristic time curve of the lower circuit breaker, and the short time delay characteristic curve and the instantaneous characteristic curve should not intersect.
⑸ 断路器与熔断器配合使用时应考虑上下级的配合，应将断路器的安秒特性曲线与熔断器安秒特性曲线比较，以使在发生短路电流的情况下，具有保护选择性。
When the breaker is used in conjunction with the fuse, the combination of the upper and lower stages should be considered. The safety of the circuit breaker should be compared with the safety second characteristic curve of the fuse, so as to make the protection selectivity in the case of short circuit current.
⑹ 断路器作配电线路的保护时，宜选用带长延时动作过流脱扣器的断路器，当线路末端发生单相接地短路时，短路电流不小于断路器瞬时或短延时过流脱扣器整定电流的1.5 倍。
When the circuit breaker is used as the protection of the distribution line, a circuit breaker with a long delay over current tripping device should be selected. When the single phase grounding fault occurs at the end of the line, the short circuit current is not less than 1.5 times the setting current of the instantaneous or short delay overcurrent release.