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.
本发明公开了一种用于电动机保护断路器的开关机构，所述开关机构能够减小调节手柄所需的力，并能够加强断开电路的可靠性。
Disclosed is a switching mechanism for a motor protection circuit breaker capable of reducing a force required to adjust a handle, and capable of enhancing the reliability to break a circuit.
本发明公开了一种用于电动机保护断路器的开关机构，所述开关机构能够减小调节手柄所需的力，并能够加强断开电路的可靠性。
Disclosed is a switching mechanism for a motor protection circuit breaker capable of reducing a force required to adjust a handle, and capable of enhancing the reliability to break a circuit.
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