继电器是保护系统的逻辑元件，它感知故障，并使断路器解扣电路带电和断路器打开触点。
Relays are the logic elements of a protection system which sense the fault and cause the circuit-breaker trip circuits to be energized and the breakers to open their contacts.
一个简单的电路断路器提供精密过压和过流保护。
A simple circuit breaker delivers precision overvoltage protection and overcurrent protection.
这些防护装置包括附加的保护器件，以增强由常规的电路断路器和保险丝系统所提供的保护。
These include add-on devices for protection in addition to that afforded by conventional circuit-breaker and fuse systems.
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