Unusual old rectifiers

[ppppenguin]

I found 4 of these unusual looking rectifiers at the Vintage Wireless Museum the other day. In a box of stuff that was earmarked for disposal, so I acquired them.

Each has 2 designations on it, but both are different on all 4.

R49686 - looks like a serial number, done freehand with an engraving machine.

S3G12CB23X: The other have similarly formed numbers but all are different.

Google has produced nothing. Any ideas as to ratings?

[Ed_Dinning]

Hi Jeffery, could be off a 70's or 80's fork lift controller (say 200PIV), or some industrial plant where it could be up to 1kv PIV.

RMS current rating on suitable heatsink up to 350A.

Westcode, AEI / Marconi likely makers, any logos on them?

Ed

[ppppenguin]

They each have a diode symbol on them, the ones with red lead have the cathode at the lead end. Other way for the ones with blue lead.

There may be a sort of indistict symbol to the left of the diode symbol which might relate to the manufacturer.

[Refugee]

I have got a large bridge rectifier that has two diodes of one polarity and two of the other. It came from an old emergency lighting charger from the 1960s and from the remains of the same item I got a huge five sided 4 ohm resistor that I often use as a dummy load.

[Ed_Dinning]

I think the diode was an AEI logo, stylised "W" for Westcode.
They were available in pigtail anode or pigtail cathode versions (denoted by "R"at the end of the type number) to make building bridge rects easy.

Ed