How to determine the size of high and low voltage protectors, automatic single-phase voltage protector selection scheme

Purchasing high- and low-voltage protectors, especially in industrial applications, is a critical task. The size and model selection of high and low-voltage protectors directly affect the safety and reliability of the circuit system. In the selection process, many factors must be considered, including the type of equipment to be protected, the voltage level, the current characteristics, and the environmental conditions. This article will introduce the method of selecting the size of high and low-voltage protectors and provide a detailed automatic single-phase protector selection scheme.

Steps to select the size of high and low voltage protectors

Determine the current requirements of the device: Check the nameplate or manual of the device to find the current rating. If the current rating is not specified, it can be calculated by dividing the device’s power (in watts) by the voltage (in volts). For example, a 1200W device running on 120V will consume 10A (1200W ÷ 120V = 10A).

Match the size of the high and low voltage protector: Choose a high and low voltage protector that is slightly larger than the current requirement of the device to ensure that it can handle the current consumed by the device while protecting the device from surges.

Common high and low-voltage protector size ranges include:

15A: Suitable for most small household appliances

20A: Suitable for medium-sized devices such as refrigerators and washing machines

30A: Suitable for large devices such as air conditioners and electric furnaces.

Single-phase automatic voltage protector size selection considerations

‌Surge capacity‌:

Surge capacity measures the ability of the automatic voltage protector to absorb surges, usually expressed in joules (J). For general household use, a surge capacity of 1000-2000J is sufficient. For household devices that require higher voltage protectors, such as electronic devices or sensitive devices, it is recommended to use a single-phase automatic voltage protector with a higher surge capacity (such as 5000J or higher).

‌Lightning protection standards‌:

The selection of high and low voltage protectors must meet the acceptance requirements of lightning protection standards and the actual protection needs of the product.

‌Types and specifications‌:

High and low voltage protectors are classified by type, including socket voltage protectors, power supply voltage protectors, etc.

Correctly selecting the size and model of Yixing high and low voltage protectors is crucial to protecting electrical equipment from voltage surges. According to the operating voltage, rated current, installation location, and response time requirements of the equipment, you can choose a suitable surge protector.