Electric actuators play a vital role in power systems as they are used to control circuit breakers, isolating switches, and other switching devices. These actuators utilize the rotational motion of an electric motor to convert it into linear motion, enabling the opening and closing of switching devices.

Electric Motor
The core of an electric actuator is the electric motor, typically a DC or AC motor. The start and stop of the motor are controlled by the operation circuit, and the rotational motion of the motor serves as the power source for the entire actuator.

Limit Switch and Travel Switch
To prevent motor overload and ensure that the switching devices do not move beyond their intended positions, electric actuators are equipped with limit switches and travel switches.

Control Circuit
The control circuit includes circuits for start-up, shutdown, overload protection, etc., and controls the operation of the electric motor through operation buttons, remote control signals, or automatic control signals.

Energy Storage Mechanism
For some circuit breaker actuators, an energy storage mechanism may be required to accumulate energy to provide sufficient power when the circuit breaker is activated. This mechanism can be spring-loaded or hydraulically powered.

Monitoring and Indication Devices
Electric actuators are typically equipped with indicator lights, position indicators, and other monitoring devices to display the status of the actuator and the position of the switching devices, facilitating monitoring and maintenance by operators.

Conclusion
Electric actuators are indispensable components in power systems, enabling the efficient and reliable operation of switching devices. Understanding the key aspects of electric actuators is essential for ensuring the smooth functioning of power systems.