It is often said that if there is no over voltage and under voltage protection devices, we can use the circuit breaker instead. So many users to listen to this method, with a circuit breaker instead of over-under voltage protection to protect the electricity load, the results more harm than good, household electricity load or a problem. In fact, both products are power protector, but there are essential differences between the two, the following detailed to explain the difference between the two, mainly from the same point and different points to explain.

Same point between the over voltage and under voltage protection devices and the circuit breaker
1. Both products are on the circuit and the electricity load, play a protective role, both are very commonly used protection of electrical appliances.
2. Both products are applied to the principle of electromagnetic relays, the use of electromagnetic relay control circuit interrupt and open the role.

Difference the over voltage and under voltage protection devices and the circuit breaker
1. Although both products have a protective effect on the circuit or the electrical load, the protection of the two is different. Over-voltage protection device, mainly when the circuit power supply voltage overvoltage or undervoltage situation, the protection of the circuit, so as not to affect the life of the load or direct damage and other issues. The circuit breaker is mainly on the circuit when the short circuit and overload conditions, the circuit or electricity load protection, which is the essential difference between the two. However, with the development of circuit breakers, it may gradually emerge at the same time with short circuit, overload and over-voltage protection of the circuit breaker, then the circuit breaker may replace the undervoltage protection.
2. Self-resetting over-voltage protection device is a low-voltage electrical appliances, and circuit breakers are suitable for high-pressure products, but also with low-pressure products.
3. Now most of the over-voltage protection device, with automatic recovery function, when the circuit voltage is stable, the over-voltage protection device can automatically connect the power supply, which is self-reset over-voltage protection device. And only a very small part of the circuit breaker with automatic recovery function, after power failure to return to normal need to be connected to power.
4. In many functions there are differences, over-voltage protection device with a delay function, while the circuit breaker with an arc function, and some alarm function.
5. Installation in different ways, self-resetting protector is generally used rail installation method, and the circuit breaker has a plug-in, fixed and drawer.

Above for the main difference between the two protector, there is only two at the same time protection, in order to avoid the circuit and the electricity load failure.