Fuse Parameters for 12/24V 15A Rectifier: Broken Socket, 2A Replacement? Photos Included

Question

Hello,
I got a rectifier like the picture. The problem is that the rectifier fell and broke the fuse socket. I set up my own nest.
I don't know what parameters should I insert the fuse? According to the sticker of this pseudo rectifier, the 6A rectifier should be 750mA. If this one has 15A then it should be 2A?
Photos:

niewolno2 · Answer

Why exactly 2A?

rooneyasd · Answer

I don't know, I gave it as an example.

rafbid · Answer

This charger looks like 6A. I would use a 500mA fuse and if it burns out during normal charging I would exchange it for 750mA.

For comparison, I have a 12 / 24V 15A rectifier.
The primary fuse is 3.15A
Secondary fuse 20A
Ammeter up to 30A several times when charging deviated to the end of the scale.

rooneyasd · Answer

Hello. 500mA and 750mA have switched after the second power-up the same with 1.5A. I gave 2.5A and dry running. I will check in practice and let me know if I am suitable.

Anonymous · Answer

This rectifier is still on selenium It is historic ... 15A it's rather not there. Do not give a larger fuse as you gave, even if it burns, give the same ....

beam_beer · Answer

Hello.
You have a transformer in the rectifier.
You measure the core cross section.
You calculate the maximum power of the transformer (core cross-section square)
On this basis, you calculate the current (power divided by voltage, cos fi you can take 1)
You choose the nearest smaller fuse value.

jaga134 · Answer

This rectifier will never give 15A rectified / direct current. It is assumed that the efficiency of the selenium rectifier is max 100mA from one cm2. I estimate it at 2.5A. However, if the fuses burn out during idle operation, i.e. without connecting to the battery, it can be assumed that during the fall the insulation between the tiles damaged. It's best to replace the plates with silicon diodes. It is convenient because I can see the voltage regulator board there, so you can easily set the desired charging current. Probably 1A fuse is enough to charge 12V batteries with 6A.

Rezystor240 · Answer

The transformer is an inductive element and consumes more current during 'start up'. Have you used a slow-blow fuse?

rooneyasd · Answer

In sequence:
1. Trafo has a 3.3 cm core. If I counted correctly, the fuse should be 1A
2. Earlier fuses were unfortunately fuse. It wasn't until 2.5A that I found slow motion. I'll be in the shop by the way, I'll buy some delayed and check.

Fuse Parameters for 12/24V 15A Rectifier: Broken Socket, 2A Replacement? Photos Included

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