GAEYAELEDelay on Time Relay Electronic 16A 1SPDT Adjustable Timer Delay Relay Din Rail Modular with CE CB Certificate(GRT8-A1,AC/DC12V-240V)

Good design and works well.

I ordered this as a replacement for a stairway-lights timer in a block of flats.I had intended to order the B1 version but ended up with A1 somehow. It still works, but the relay is energised when the lights are off.The main problem is that the switch-line (S) input is extremely sensitive. This caused some confusion for a while until I realised what was going on: I had to remove the neon indicators from two outdoor press-switches to avoid having the relay triggered constantly. (It is common in stairway circuits to have indicators wired across the switch terminals so that the switches are visible in the dark even though no neutral is provided at the switch)

I got the 'delay off' version to tie into a pump for hot water recirculation. Works perfectly.

Using this in conjunction with a contactor to limit the runtime of my air compressor. I like the compressor to stay charged, but as it's unattended for extended periods, I don't want it to run for hours and hours in the event of a major leak. I have it set to about 30 minutes so that the compressor won't run longer than that.

I was in the market for a delay off relay and couldn't find anything like this in my local area. This particular relay is amazing for what it can do. The input voltage of 12 to 240 volts makes it very useful for so many different applications. The delay off range of 1 second to 10 days should satisfy just about every use possible. Single pole double throw with both NO and NC contacts is very handy too. And the price! I just hope it will last because replacing it will be expensive.The timing circuit is triggered on at startup and is a bit of a pain as others have pointed out but isn't a deal breaker in my opinion.I think of it this way, for one price you are getting one relay that can control two devices at the same or different voltage, in sequence and includes a timer. This particular relay is controlling a well pump and a solenoid to flush a sediment filter. The relay turns off the pump and turns on the solenoid to flush the sediment from an inline filter. Once the cycle is complete it turns off the filter drain and turns the pump back on. Works fantastic so far and is much better at controlling these circuits than the solid state timer relay it replaced.I'm obviously not an electrician and I could figure this out. Just connect A1 to power and the A2 terminal to ground or neutral. Jump power from A1 to the S terminal. This energizes the relay until you remove the power from the S terminal. At that point the timer is active keeping the circuit energized until the time you set expires. Easy peezy. If you're squeamish about working with high voltage, connect it to a 12v battery or power source to do your experimentation.One last thing. They make a model that delays coming on (A model) and one that delays going off (B model). Both look identical. This is the B model. Look at the last letter of the model number. Based on some of the reviews, people are buying the wrong one and are disappointed when it doesn't work as expected.

Relay is used in the power outlet for an air compressor. I set the relay timer for 1/2 hour so that the compressor will not run when left unattended.

I hooked this up to the marine head on my boat, set it to 'on' for 10 seconds. Works great, has many different settings and options.