I have a 70s vintage circuit that uses a Triridge brand reed relay. It's marked with part number "220-100", and it's four pin, normally open. The operating voltage for the coil as seen in the circuit (and designed on the schematic) is 12V.
It's "sticking" closed when it's supposed to open sometimes (including with no power in the circuit at all), and I'm trying to determine why-- whether it's just old and been damaged from previous overcurrent excursions, whether it's under-rated for the current passing through it, some combination, etc.
I have been unable to find a scan of any data sheets or data books on eBay or whatever for this brand of relays. They seem to have made a ton of variants with often-confusing part numbers. I'd like to know what the voltage and current ratings actually are for the switching circuit.
Any pointers appreciated! Thanks.