Resettable fuse - the difference between plug-in and SMD

mk0007

Resettable fuse - the difference between plug-in and SMD [Copy link]

Resettable fuses can be divided into plug-in type and chip type according to their shape. Today, we will mainly introduce the differences between plug-in fuses and chip fuses: [font=] [font=] First, the size of the recoverable plug-in fuse and the chip fuse is different. The volume of the plug-in fuse is relatively large, and the volume of the chip fuse is relatively small. Customers should choose the shape of the fuse according to the size of the design space. [font=] [font=] Second, there is a difference in current between the recoverable plug-in fuse and the chip fuse. The current of the plug-in fuse can be relatively large, the maximum can be 14A, and the chip fuse can only be 6A. [font=] [font=] Third, the voltage of the recoverable plug-in fuse is different from that of the chip fuse. The voltage of the plug-in fuse is larger than that of the chip fuse. The maximum current of the plug-in fuse can be 600V, while the chip fuse can only be 60V. Fourth, the response speed of the recoverable plug-in fuse and the chip fuse is different. The response speed of the chip fuse is faster and more sensitive than that of the plug-in fuse.

熊仔饼干

I bought a 20A plug-in on Taobao. Is it reliable? I doubt it and dare not use it.

熊仔饼干

The pins don't look like they can handle 20A.

qwqwqw2088

Bear Biscuit posted on 2018-8-27 15:50 The pins don't look like they can handle 20A.

If the connector is a pure copper terminal, a 4mm terminal can handle a high current of 20A.

熊仔饼干

qwqwqw2088 posted on 2018-8-30 09:05 If the connector is a pure copper terminal, 4mm can generally pass 20A high current

4 square wire seems to be able to pass 30 amps, your diameter 4mm is more than 10 squares, it feels OK, the one I bought before has a pin of about 1.2mm, and then the experiment not only did not protect, but also caught fire. It's over.

qwqwqw2088

Bear Biscuit published on 2018-10-17 17:08 4 square wire seems to be able to pass 30 amps. Your diameter is 4mm and it is more than 10 squares. It feels OK. The one I bought before has a pin of about 1.2mm and a resettable fuse. Then...

It is possible. Generally, pure copper is calculated at -6A per mm2. It must be pure copper. If there are impurities in brass, a margin can be reserved.

熊仔饼干

qwqwqw2088 posted on 2018-10-17 17:25 It is possible. Generally, pure copper is calculated at -6A per mm2. It must be pure copper. If there are impurities in brass, a margin can be reserved.

The self-recovery resistor I bought on Taobao is rated at 20A. Under the condition of 12A, it burned out after being powered on for about 8 hours, and even started a flame.

damiaa

The resettable fuse depends on the current and voltage switching speed.