TWTADE/DC 12V Electromagnetic Power Coil Relay 10A 8 Pins 2DPT 2NO 2NC with Indicator Light and Socket Base -YJ2N-LY

I used this to control a remote well pump. The 24VAC signal from my sprinkler system controls this relay, which in turn opens and closes a contact which sends a WiFi signal to turn on the pump. No problems so far.

Nice and compact. Has a red LED which shows when the coil is activated. Nice feature.I used it to connect to my Blink doorbell camera to a large, mechanical chime which was otherwise incompatible with the door chime.

Relays in general can be confusing, but relays with no documentation just make it worse.While this appears to be made well and worked for what I bought it for, it sure was annoying having to puzzle through the terminals to figure out what's what. These don't appear to follow either NEMA or IEC relay numbering standards, and without instructions, you're on your own to test out the terminals. Thankfully the base is clearly marked, so that helped. My relay was supposedly a "24vac relay" but it appears to activate with either AC or DC power, I tried both successfully at 24 volts.If it helps anyone, here's the breakdown of an 8-pin:Pins 7 & 8 are your coil terminals, which activate the relay when power is applied to them. If AC is being used to activate the relay it doesn't matter, but if DC is activating the coil then pole 7 is negative and 8 is positive.Pins 1, 3, and 5 work together as a circuit.Pins 2, 4, and 6 work together as a circuit.The above is what makes this a "Dual Pole" (DP) relay - there are two independent poles where 1/3/5 (the terminals making up pole 1) do not touch terminals 2/4/6 (pole 2). You could use those two poles independently, such as to power two different devices requiring two different voltages, or you could use one pole as a power supply and the other as as a ground. There's a lot of options.Using just one pole as example, this is how the terminals can work:Pin 5 is incoming power that will be delivered to either pin 1 or pin 3, depending on if the relay is activated or not. It's labeled as "COM" because pins 1 and 3 have pin 5 in common.Pin 3 is "Normally Open", which means that when the relay is off/deactivated, there won't be any power supplied to pin 3 from pin 5. Power will only be applied to pin 3 when the relay is activated.Pin 1 is "Normally Closed" and works opposite of pin 3. When the relay is off/deactivated, there WILL be power supplied to pin 1 from pin 5. When the relay is activated, there will be no power to pin 1.Because the 1/3/5 circuit makes one circuit when it's powered and another when it's powered off, it's called a "Dual Throw" (DT).Combined together, this is a DPDT relay.Pins 2, 4, 6 work the same as the above.In my case, this relay was used to power a 120v outlet used to activate an outdoor fountain. A diagram is attached with details. I needed to be able to turn on this fountain two ways - either on a schedule from my smart home devices, or else manually via a hardware switch at the fountain. By utilizing the Dual Throw feature of the relay, I was able to accomplish this - when the relay is deactivated/off, power is supplied to the manual switch. When the relay is activated, power is killed to the manual switch.

First relay base sent had an open in it. Amazon shipped replacement within 2 days. It worked perfectly.

I have purchased a number of these in days past. I cannot speak to their durability as I have yet to push them to their limits. But they are simple enough to install and operate. I have purchased this one specifically to match the rest and for a lower coil voltage. They always include a chunk of aluminum DIN rail for mounting. If you know the relay type it's simple enough to swap with a new one. Though I end up buying the whole assembly. Note: the safety strap can be a bit of a nuisance to replace after relay swap.

I was building a custom sound system in my project car requiring the placement of the amp and crossovers in an accessible location other than under the front seat because of the multiple adjustments on the amp and crossovers. So I placed it on a custom surface I'm building behind the seats where it will be visible in the cabin. I built a plastic box around it but worried that the heat from the amp would be damaging. So I designed in two cooling fans to direct air flow across the amp within the box but only wanted the fans to activate when the radio was turned on. The radio sent a triggering signal to the amp but since it's only purpose was to turn on the amp, I had doubts that it could handle the extra load of two fans. So I incorporated this relay to connect the fans to the amp power source when the radio was on. I'd never wired a relay before but after watching YouTube videos it all became clear. And the system works perfectly.

Very pleased with the performance and ease of wiring the terminals on this relay. Great product for the price, so I ordered two! Love it when a product performs exactly as advertised. This relay actually took the place of a $40+ automatic transfer switch I was originally using. Can't wait to find other uses for these type of relays. So many possibilities.