On the practical base, the article analyzes endanger of low-voltage motor control circuit without fuse and necessary of fitting the fuse in the circuit.
在实践的基础上，分析了低压电动机控制回路不装熔断器的危害性，及其装设熔断器的必要性。
2
To resolve the large time jitter error of middle-long range action in UWB fuse systems, a novel time system base on crystal frequency division has been proposed.