Choose high-quality voltage protectors

Summary: Selection of self-resetting overvoltage and undervoltage protector 

Keywords: self-resetting overvoltage and undervoltage protector, three-phase four-wire self-resetting overvoltage and undervoltage protector, self-resetting overvoltage and undervoltage protector 4P, self-recovering overvoltage and undervoltage protector, overvoltage protector, EMC test 

  The self-recovery overvoltage and undervoltage protector is a new product that has emerged in the past two years. It is mainly a protector for protecting distribution lines from overvoltage and undervoltage, and can automatically disconnect when there is an overvoltage or undervoltage, and automatically switch on when the voltage is normal. 

  Due to the large number of manufacturers producing self-recovery overvoltage and undervoltage protectors, the prices and quality vary greatly, making it difficult for customers to choose. So how can we choose an affordable self-recovery overvoltage and undervoltage protector product? 

 First, understand the composition of the self-recovery overvoltage and undervoltage protector. The main components of the self-recovery overvoltage and undervoltage protector are: housing, electronic component board, relay, wiring device, and conductive brush wire. After understanding the product composition, it is relatively easy to choose the right product. The quality of a product can be seen from the following aspects: 

1. For the shell, check whether it uses flame retardant materials, and whether the shell material is fine. If it is a refurbished material, the appearance is relatively rough and the color is relatively dark. A good quality product shell is made of new materials, and the words on the panel are laser-engraved and cannot be erased. Such products generally have better craftsmanship and quality. 

2. The electronic component board is the heart of the self-healing overvoltage and undervoltage protector, so the test must be taken seriously. The electronic component board needs to undergo the following tests: 

A. For electromagnetic compatibility (EMC) testing, the surge test voltage is between 100MHz and 1000MHz, with an interval of 20 pulses. The electrical fast transient burst voltage is 4000V, the pulse frequency is 5kHz, the duration is 15ms, and the cycle is 300ms. The protector will not malfunction, which proves that the product quality is definitely good. (All products of our company have passed the test. In October 2018, they have passed the national CQC product certification for AC380V to AC450V voltage. One week later, the self-resetting overvoltage and undervoltage protector was restored to normal voltage. If the self-resetting overvoltage and undervoltage protector still works normally, it indicates that the product is a high-quality product with excellent overvoltage resistance. This test is also the performance of the entire product. If this product can be damaged by overvoltage itself, then installing this product will lose its significance. Currently, low-cost products in the market cannot withstand this test. Therefore, it is crucial to take fire prevention measures when doing this test to prevent unnecessary losses caused by defective products. Remember!) 

3. Relay detection 

Generally, most manufacturers use electromagnetic relays for small currents and magnetic latching relays for large currents. This is self-evident and can be seen by opening the product. It is recommended to use products with magnetic latching relays, which provide good protection against inrush currents. 

4. Inspection of energized wires 

This is more intuitive. Open the product and check whether the wire is copper and the size of the wire. 

5. Anti-harmonic detection 

If ordinary products are used in bulk, they may suffer from damage in batches, mainly manifested by the gradual dimming of the indicator lights on the product. These are all inferior products, and there is currently no effective testing method for this situation. Customers can only see it after using them in bulk, but professional technicians can see it by dissecting the product (currently, our company's economical and standard products will not be damaged under harmonic conditions). 

6. Power consumption test of the entire product 

If the power consumption of the whole electromagnetic relay is about 1.5W, and the magnetic latching relay is about 0.8W, the test voltage is AC230V (single-phase self-resetting overvoltage and undervoltage protector). If you are a wealthy person, you should choose the electromagnetic relay type, otherwise you should choose the magnetic latching type self-resetting overvoltage and undervoltage protector.