The Difference Between Isolating Switch And Circuit Breaker
There are significant differences between Isolator switch and circuit breakers in terms of function, structure, operation mode and usage occasions.
1. Functional differences
Isolating switch: It is mainly used to isolate the power supply to ensure that the electrical equipment is completely isolated from the power supply during maintenance or inspection, providing a safe working environment. It does not have an automatic protection function, cannot cut off the load current or short-circuit current, and can only be operated under no load or very small load.
Circuit breaker: It has the function of automatically cutting off the circuit, and can respond quickly when the circuit has abnormal conditions such as short circuit, overload, undervoltage, etc., to protect the safe operation of electrical equipment and lines. The circuit breaker is equipped with a sensing element that can monitor the change of current in real time, and automatically trigger the operating mechanism to cut off the circuit when abnormal current is detected.
2. Structural differences
Isolating switch: The structure is relatively simple, mainly composed of contacts, base, support insulators, connecting rods, etc., and usually has no arc extinguishing device (except for special designs). Therefore, the isolating switch is required to be operated under no load or very small load to prevent the generation of arcs and cause dangers.
Circuit breaker: The structure is complex and consists of multiple parts such as contact system, arc extinguishing system, operating mechanism, and protective device. The arc extinguishing device is used to extinguish the arc that may be generated when the contacts are separated to prevent the arc from damaging the equipment and lines.
3. Differences in operation methods
Isolating switch: It is mostly operated manually on site, and the opening and closing of the switch are achieved by rotating or pulling the operating lever. This method is simple and intuitive, but the operator needs to go to the site to operate.
Circuit breaker: It is mostly operated by remote control electric operation, and the opening and closing of the switch are achieved through the control circuit and the electric operating mechanism. This method improves the convenience and safety of operation, and is especially suitable for power systems with high remote control and automation. In addition, the circuit breaker also has a manual operation function.
4. Differences in use occasions
Isolating switch: It is mainly used as the main switch of the distribution circuit, and in occasions where the power supply needs to be isolated, such as isolating the power supply during repair and maintenance to ensure safety.
Circuit breaker: widely used in various circuit protection occasions. It can be used as the main switch of the distribution circuit or as the protector of the distribution circuit, playing the role of overload protection and short circuit protection.
In summary, the isolating switch and circuit breaker have their own characteristics in function, structure, operation mode and application occasion. The appropriate electrical equipment should be selected according to specific needs.
