SSR-25DD Solid State Relay DC to DC (Input 3-32V DC Output 5-60V DC) with Heat Sink, 25A

Nice ssr. Relays do go bad; I have two old ones neither was working so I had to buy a new one. I like this one because of the red led when the circuit is working and the load is applied. My old ones didn’t have that and I had to use a volt meter to figure out what was going on. Not hard to do but one more thing.

Used this to make a remote turn on for my ceiling fan in Gazebo. Works great.

I have the DC to DC version of this and when I wired it up, it incorrectly allowed current flow even with nothing connected to the input. I thought it was defective but before giving up I tried reversing the load and the supply wires and now it works perfectly.In particular, the diagram uses the SSR-60DD as an example:1) It shows an AC supply voltage but the device is DC-to-DC2) It shows supply voltage on terminal 1 and load voltage on terminal 2. That is backwards and those should be reversed.I can't yet speak to the longevity of the product since I've only been using it for 1 day.

Easy installation. The relay in the thermostat makes more sound than the SSR-25AA

Comes with a cooling fin but I have not noticed it getting hot at all

It takes over 4 volts to drive these. I suggest that you hook it up to a variable power supply and measure the drive needs before using it. Otherwise it works well

Just used to complete a circuit with a simple open contact flood sensor. There's a large voltage drop on a 12v relay but this contact will still close with low voltage... I tested I think as low as 3v it's in the specs. The voltage drops to 7ish volts for my use which still closes the relay. This in turn will send power to an normally open valve closing it off to prevent further flooding. At 12v it doesn't get hot but I attached the large heat sink anyways with no paste just to keep it elevated. I had to find some screws for that. They could have included it so minus one star for lack of 2 screws.

Installed it on my 3D printer to drive a new Heated-bed and it could handle the load with no problem