Phil,

These are the ones that I bought...

https://www.ebay.co.uk/itm/Single-Ax...vbgiYCPuIMIsVA


Although my seller went under the name of "bigger*gift", but we all know the Chinese are a little agile with their naming. I think the discriminator is the 50V and 5A rating.

I'd caution, however, the subject of this thread and that mine, bought April/17 required the opto-isolators replacing.