Car factories only use black auto relays and other colors.

The transparent relays are developed for after-sales from small auto relay factories.

This article will introduce the difference between the transparent auto relays and black shell auto relays.

We may see there are many transparent relays on sales in market. The picture is as followed. How is the quality of them and why they're so cheap?

How is the quality of the transparent relays? 

The price of the transparent relays are highly different in the market ranging from ￥1.3-￥3. As we know the higher quality the higher price, so the lower price the worse quality. Many transparent relays on the market use iron pins, aluminum coils (copper covered)and copper contacts. However, car factory and large relay companies will use copper/brass pins, copper wires and AgSnO₂/AgSnO₂InO³ (can reach 100000 cycles electrical life) contacts. The bad materials can cause problems:

a. safe problem - if use aluminum coils, the wires will be burned when current or temperature is too high. Relays stop work and may cause car stop on the road or other controlled parts damaged.

b. short life cycle- if use copper contacts, the relays life will not exceed 5000 cycles. So the relays are damaged soon and need to be changed often. Customers will claim the quality and make the reputation of the stores to be bad.

c. parts damage- use bad quality auto relays may cause the other original and well-working parts such as fans, air conditioners, lights damaged. It will cause large loss to change the expensive parts.

Why I see many transparent relays print 80A/100A?

This printing is fake printing. Please never use this relay under 80A/100A. It will cause safety problem. 

Many trading companies will fake print on the transparent relays with 80A, 100A but these relays can not even pass 40A relay test (even the double contacts type). The reason is that current is decided by the pin width. The larger pin width, the higher current. 6.3mm pins can max. load 40A. Therefore, only the big pins 9.2mm can load 80A from the thesis perspect.

What's the advantage of the transparent relays?

There are also advantages of transparent relays. The led light and transparent shell can easily show the relay is working or not.

Recommendation

If you are concerned of the quality, if you want to sell to car factories, if you want a good reputation of your store, we would recommend you to buy black shell auto relays.

If you like the transparent relays, we would recommend you to buy transparent relays with good materials (car factory setting) to guarantee the quality.