保险丝或断电器可以保护电路中的电线不致过热。
The wires in circuits are kept from heating by either fuses or circuit breakers.
在电流过大或设备有故障时，能自行熔断以切断电路的保护电器。
In the current is too large or equipment failure on their own to cut the fuse protection of electrical circuits.
电源断电或充电电路出现短路、过流、过热时，充电器上的充电指示灯均不亮。
A short circuit, over current and over heat are short circuit, over current and over heat, and the charging indicator light on the charger is not bright.
介绍了一种采用CMOS数字电路、数字拨盘开关整定、无辅助电源的断电延时继电器的组成及工作原理。
Introduction was made to the composition and working principle of a power-off time delay relay which adopts CMOS digital circuit, digital dial disc for switch setting and without auxiliary power.
柜内的电路中还装有气体压力调节继电器，以便在柜体漏气造成其内气压过低时及时切断电路。
An air pressure regulating relay is arranged in a circuit in the cabinet to cut the circuit in time when air leak happens in the cabinet body to make the air pressure in the cabinet too low.
能接通、承载和分断正常电路条件下的电流，也能在规定的非正常条件（例如短路条件）下接通、承载一定时间和分断电流的一种机械开关电器。
Mechanical switching device capable of making, carrying and breaking currents in normal circuit conditions and, when specified, in given operating overload conditions.
能接通、承载和分断正常电路条件下的电流，也能在规定的非正常条件（例如短路条件）下接通、承载一定时间和分断电流的一种机械开关电器。
Mechanical switching device capable of making, carrying and breaking currents in normal circuit conditions and, when specified, in given operating overload conditions.
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