I ordered a half dozen of these huge, high current rectifiers from Goldmine for use as paper weights. That’s about all they can be used for until I find some specs or a data sheet for them. The metal base is 3 inches or 76 mm square. I have seen rectifiers much smaller than this that can handle 35 amps, so I’m guessing that these can handle a hundred or more amps. I’m hoping that they are Schottky rectifiers that were used in a battery charger or an electroplating system. I intend to use them for connecting two or more lead-acid car batteries in parallel.
The case is marked SR1625, which could mean silicon rectifier, or Schottky rectifier. The rest of the numbers could be house numbers, in other words numbers that the company who bought them had put on. Those would not be traceable unless one had access to the company’s records. But these parts are so unusual that there are only a few other parts like them that were made. That makes it easier to narrow down to a lot fewer possible choices. I could just assume that they can handle 100 amps, and a few dozen volts, which would be good enough for connecting 12V car batteries in parallel.
In the ad, they gave some measurements of the package. I looked in an old Motorola data manual for the same size package. They match up with the MR1230 series of rectifiers, which are rated at 50 to 600 volts, and 300 amps!! Wow! The other similar but slightly smaller packages are rated a minimum of 200 amps. So it looks like I bought some excellent choices for paralleling car batteries.
Update Apr 29 – They emailed me that they are sold out of the giant rectifiers. It looks like my luck ran out. 🙁
I could not find ether number in Motorola’a Master Selection Guide and Catalog, 1977, but, they listed 2 at the 3″ square dimension: MR1245SL,FL and MR1249SL,FL that will handle 450A at 300v & 600v respectively. There in what is listed as a ‘Case 135’.
Thanks for the info. I wish I had been quicker and got a few.