Looking into part number TNR15G431KM, originally made by a company called Marcon, I was able to find at least a decent alternative option if anyone is looking for these. I had to use a third party site (linked here) to find a scan of the old data sheet which gave me the following specifications.
Maximum Continuous Voltage: 275VAC, 369VDC
Maximum Peak Current: 4kA
Maximum Energy: 75J, for 1msec
Clamping Voltage: 50A; 700V
Capacitance @1kHz: 480pF
Varistor Voltage: 430 nominal (min-max is 389-473)
Alternate GE Model Number: V275LA15A
The āAlternate GEā number was a dead end for me, but using these specifications I was at least able to find a decent alternate in part number F3021-ND.
| MFR PART # | V275LA20AP |
|---|---|
| DIGIKEY PART # | F3021-ND |
| MANUFACTURER | LITTELFUSE INC. |
| DESCRIPTION | VARISTOR 430V 4.5KA DISC 14MM |
| DATASHEET | Click Here |