There is always an internal circuit breaker to protect the instrument from overload.
总有一个断电器以防止仪器超负荷运转。
《柯林斯英汉双解大词典》
2
Distribution circuit breaker a distribution circuit breaker is a device used for overload and short current protection of loads connected to a main distribution device.
配电线路开关配电线路开关是给连接在主配电设备上的负荷提供过载和短路保护的装置。
3
The electrical supply has the proper overload fuse or circuit breaker protection.