Replacement Relay - Page 1
Forum section: electronics / projects

author: RyanG
author_rank: Regular Contributor
timestamp: February 28, 2018, 01:13:04 am
content: I have some big PCBs here with relays that are in sockets. I have been trying to find replacement relays for these boards for a while. The originals are Guardian brand, who doesn't make this stuff anymore. The relays seem to have a different socket than any other ones I have found. I have basically run out of the 24vac relays, but I have a bunch of the 12vdc and 120vac relays. Anyone have any somewhat easy ideas on replacing those because most replacement relays are running about $30 a piece, which seems a little expensive?

author: Nusa
author_rank: Super Contributor
timestamp: February 28, 2018, 01:25:48 am
content: You could use the connector bases from defunct relays as an adapter to a different relay or relay socket.

author: RyanG
author_rank: Regular Contributor
timestamp: February 28, 2018, 01:28:11 am
content: That is true. Someone has done that on a few relays here before.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: February 28, 2018, 01:53:02 am
content: First off I would ask if you have tried repairing the old relays. Sometimes there is a problem with the coil wire physically breaking and may be repairable. If the contacts are gone, it is possible to repair but very fiddly. The plastic case sometimes is just snapped on, while others are gas filled and welded shut. The welded shut ones are problematic.Another solution would be to replace with similar rated relay that doesn't match the old footprint. This is not insurmountable, especially if you know someone with a 3d printer. A clever person could engineer and fabricobble something workable. The coil and contact ratings would need to be the same as the old one, voltage and current wise. It is possible to use a different relay that has a different coil voltage/current rating, but then your power rail becomes a problem.If the "big PCBs" are strictly for the relays, can you replace these PCBs with a new PCB relay board of your own design? The new design, of course, would have modern relays of a varitey that is plentiful and cheap, which suit your requirements. Also, there are many off the shelf relay boards available that are fairly inexpensive.Hope this helps...

author: RyanG
author_rank: Regular Contributor
timestamp: February 28, 2018, 01:57:22 am
content: I have been looking into trying to make something to interface newer relays with these boards. The board actually has a ton of inputs and outputs on it, so it is not easily replaceable. The PCB is connected to another 4 or 5 boards with edge connectors and other plug in type connectors.

author: Nusa
author_rank: Super Contributor
timestamp: February 28, 2018, 02:12:03 am
content: http://www.electronicsurplus.com/guardian-1335-2c-24d-relay-power-dpdt-5amp-24vdc-18149Listed at $3.95. Certainly worth a phone call to see if it's real.

author: RyanG
author_rank: Regular Contributor
timestamp: February 28, 2018, 02:21:37 am
content: I need the 24vac relay. I am guessing the 24vdc relay may work, but I know the coil resistance is double on the DC relays.

author: Nusa
author_rank: Super Contributor
timestamp: February 28, 2018, 02:49:57 am
content: Here's an even better deal on the AC version to look at (8 lots of 4 relays left as I post this):https://www.ebay.com/itm/GUARDIAN-ELECTRIC-1330-2C-24A-RELAY-LOT-OF-4/331183427529I'm thinking if you just keep your eye out, you can acquire enough old stock for the life of the product without breaking the bank.