Old Rectifier Replacement

[lostinthelight]

Hi, I have an old German made battery charger, ABSAAR 20 amp with 100 amp boost thats stopped charging . I have AC to the rectifier no DC to the leads although thay do show a small AC of 3 volts.
What would be a good replacement for the rectifier please
Thanks

 

[Harry Bloomfield]

Hi, I have an old German made battery charger, ABSAAR 20 amp with 100 amp boost thats stopped charging .

That's an oldy. It's a selenium rectifier, and when the fail, they stink like you would not believe.

100 amps, this should do it - https://www.amazon.co.uk/Single-Phase-Bridge-Rectifier-Terminals-Source/dp/B07VPK87MQ

 

[lostinthelight]

Thanks Harry, as the linked one has 4 terminals , would that accommodate 6 and 12v outputs

 

[ericmark]

In the main, 6, 12, 24 volt is a tapping on the transformer.

 

[JohnD]

Thanks Harry, as the linked one has 4 terminals , would that accommodate 6 and 12v outputs

It has four terminals because AC goes in two, and DC comes out the other two.

 

[lostinthelight]

Gotcha, thanks

 

[JohnD]

The schematic is usually drawn as a diamond shape. This is the nearest I could find. AC in top and bottom, DC out left and right.

 

[Harry Bloomfield]

Thanks Harry, as the linked one has 4 terminals , would that accommodate 6 and 12v outputs

Usually, there will be marking on two of the terminals like this ∼, or marked 'ac'. The secondary/output of the transformer connects across the those two terminals. It doesn't matter, which goes to which.

There also be one terminal marked +, or +ve, your red goes to that, your black to the one marked -, -ve, neg.

 

[lostinthelight]

That's an oldy. It's a selenium rectifier, and when the fail, they stink like you would not believe.

100 amps, this should do it - https://www.amazon.co.uk/Single-Phase-Bridge-Rectifier-Terminals-Source/dp/B07VPK87MQ

Would this one give a bit of extra safety margin

Bridge Rectifier Black Single-Phase Diode Bridge Rectifier Module Output DC 150A | eBay

MDQ 150A 1600V Black Sin gle -Phase Diode Bridge Rectifier 150A Amp High Power. Designed for single phase rectification, output DC current is 150A. Output Current: 150A. 1 x Bridge Rectifier. Phase: Single Phase.

www.ebay.co.uk

 

[ericmark]

Yes

 

[Harry Bloomfield]

Yes

Seconded!

 

[lostinthelight]

Just an update on this, I dismantled the rectifier, cleaned the area between the plates and wiring tabs reassembled and it now works perfectly.... lucky or what!

 

[Harry Bloomfield]

Just an update on this, I dismantled the rectifier, cleaned the area between the plates and wiring tabs reassembled and it now works perfectly.... lucky or what!

You - were lucky, it didn't let the smoke and smell out