Fuse, leakage, electric shock protection switch, over-temperature alarm and two-level dual protection.
熔断丝，漏电，触电保护开关，超温报警及二级双重保护功能。
2
Monitor every feed-voltage and feed-current of DC output, every output state of switch, and state of fuse and lightning arrester. Under abnormal condition, monitor produces aural and visual alarm.