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Old 08-27-2011, 09:28 PM   #1
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Default Help me find replacement relay

I don't understand how to read a relay, or what all of the relay lingo means. Could someone point me to an equivalent relay at digikey or mcmaster carr, AND school me a little on what the picture means?

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Old 08-27-2011, 09:38 PM   #2
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I found one on ebay, but I want a quality relay so it doesn't crap out again. ow can you tell if it is crap or not? It controls my mosquito misting system. No mist, lots of mosquitos.

It also seemed like when this relay failed it failed in a closed state causing the pump to continuously run. I had to tap the relay to get the connection to open.
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Old 08-27-2011, 11:35 PM   #3
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The symbol means that it's a DPDT (Double-Pole, Double-Throw) relay. That means that, internally, it contains two separate switches, each of which has two positions.

Pins 1-3-5 are the first switch. Pin 5 is the "common", which is connected to either pin 1 or 3. Those diagrams always show the relay in the de-energized state, so when the relay is "off", pin 5 connects to pin 1 (The "normally closed" pin), and when it's "on", pin 5 connects to pin 3 (the "normally open" pin.)

Pins 2-4-6 are the second switch. 6 is common, 2 is N.C., 4 is N.O.

Pins 7 and 8 are the coil. When you apply 24 VAC across those pins, the relay turns "on."

The note at the bottom tells us that the contacts are rated to carry up to 30A at up to 250 VAC.


Here's a full datasheet: http://www.manhua-electric.com/Produ...Product_ID=841


To be honest, relays of this type are all pretty much the same, quality-wise. They're all made as cheaply as possible by slave labor in Asian sweatshops. I can't find any from the usual domestic suppliers, just get the one from Ebay. http://www.ebay.com/itm/JQX-30F-2Z-D...ht_2573wt_1396
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Old 08-28-2011, 03:57 PM   #4
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Thanks for the info
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