三菱 塑壳断路器；NF1600-SEW 3P A
过载延时保护
Overload delay protection
过载延时保护是指负荷电流超过设备的限定范围有烧毁设备的危险，保护装置能在一定时间内切断电源。过载有个热量积累的过程，保护动作不需要过于迅速。对于短时过电流，保护不应该动作。
Overload delay protection means that the load current exceeds the limits of the equipment and has the danger of burning equipment. The protection device can cut off the power supply in a certain time. Overload has a process of heat accumulation, and protection does not need to be too fast. For short-time overcurrent, protection should not act.
隔离功能
Isolation function
隔离功能就是要求断路器断开后的泄漏电流不致对人身和设备产生危害。多次短路跳闸后开关性能下降，泄漏电流会增大。对人体而言30mA以下为安全漏电电流，而在恶劣的环境中，超过300mA的泄漏电流持续2小时以上，就可能使绝缘损坏发生相地短路进而引发火灾。
The isolation function is that the leakage current after the circuit breaker is broken will not cause harm to the body and equipment. After many times short circuit tripping, the performance of the switch decreases, and the leakage current will increase. For the human body, the less than 30mA is a safe leakage current, and in a bad environment, the leakage current over 300mA lasts more than 2 hours, which may cause the insulation damage to be short circuited and then cause the fire.