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Your cart is empty.Product Description
How it work
Solid State Relays have no mechanical parts,the contact function is performed by a solid-state device,Since there are no moving parts,Therefore, it can work in a high shock and vibration environment to achieve contactless and spark-free connection and disconnection of the controlled circuit.
1.Need to know which Load type of device
Calculate what current you need of SSR
Device current÷Load Modulus=SSR Current
Modulus: Resistive load is 2 ; Inductive load is 6
Resistive load:Electric heating,incandescent,resistance,etc.
Inductive load:Motors,Transformers,Capacitors,Solenoid valves,Air conditioners,Lighting with inductance.
2.For Example
Calculate what current you need of SSR
1.if you have a heater with rated current of 15A,heater is resistive load, so the formula is 15A×2=30A，so you need a 40A SSR.
2.If you have a motor with rated current of 15A,motor is Inductive load,so the formula is 15A×6=90A,so you need a 100A SSR.
How to use the thermal grease
Each package with 2 small bags of thermal grease,which is applied to the back of the SSR for faster heat dissipation.
Tom H
Reviewed in the United States on February 20, 2023
I ordered the first one and tested it. No output, no LED on to let you know the input DC was being sensed. Returned it. Received the second one quickly. Tested OK.Markings are VERY difficult to read. AC on topDC on the bottom. Neg on left, Pos on the right. The red LED should come on when the voltage is sufficient to cause the SST to "turn on" and conduct through the top terminals.I can't speak to the ability of the device to handle the full 40A claimed, but they sure do provide an adequate heat sink (but no conduction grease).
DavidOrDave
Reviewed in the United States on February 18, 2023
This 40-amp, dc controlled solid-state relay will fit the bill for most home microcontroller projects is great for controlling an AC load from a logic-level signal. It turns on at about 3v as described. I also ran it all the way up to 30 v and it was fine. There are no polarity markings on the DC input. So, I connected it backwards (deliberately) through a current-limited power supply and slowly ramped up the voltage. I saw no appreciable reverse current up to 30 volts, so that’s a good thing. It should survive accidental reverse polarities on the DC input.The flip-up terminal protectors are a nice touch, as is the built-in LED on the control voltage side. This feature isn’t really mentioned in the product description. And yet – it can be very useful while troubleshooting your project. I’ve used other relays that lack this feature, so I appreciate having it. You can tell if the relay is getting an input at a glance.The included heat sink is nice, but none of my screws would fit. It would have been nice if machine screws were included. I’m guessing this is a 4 or 5 mm screw, I’ll have to go looking for one.There are a couple of things I don’t like so much. First, the plastic enclosure seems a bit on the cheap side. But it’s generally fine, I’m just being picky. I’ve seen better made relays.Another thing that could be better are the markings. I don’t know why so many products are poorly marked. There is no polarity indication on the DC input side and the fonts are small, the colors a low-contrast darkish gray against the black background, making them difficult to see. This is unlike what’s shown in the product description photo, which shows bright, high-contrast white lettering and polarity marks that are easy to see. The unit I received is hard to read unless you hold it in the light just right. That’s not always convenient when you’re wiring something up.And, there are no instructions. Fortunately, these are simple devices and there’s not that much to hooking them up. Just don’t mix up the inputs and outputs!Otherwise, this is a handy solid-state relay that will be useful for many projects.
J. White
Reviewed in the United States on February 11, 2023
This JOTTA 40 Amp AC DC Control Solid State Relay has several nice features, including flip up terminal protectors which cannot be lost. It also includes a very nice heat sink, which along with the aluminum base plate on the solid-state relay should do a good job of dissipating the heat generated by the unit when higher currents are being passed.Of course, it is not unique to this particular relay. But, these types of devices are silent, literally should practically never wear out and use a very wide range of DC control voltages at very low current draws. You can use a Raspberry Pi, for example, to control very large currents with ease.There are two things which I would have to deduct points for. The first is that the unit does not include mounting screws to attach the relay to the heat sink. This would not be particularly notable, but the holes in the heat sink are tapped. This means you need specific size and thread pitch screws to mount the relay. These small screws required are not going to be in most people's spare screw jar and actually might be a headache to locate. I think these should be included. Possibly they normally are and were just missing in my package. The second is more significant and is a common problem with many such devices. That is that there are no instructions or specifications included at all. I guess they assume you will refer to the ad text, where they give the pinouts, etc. But that is here today and gone tomorrow. If this device lives in your spare parts box for a while and you do not print out the ad photos, you may be left guessing. Since the consequences of hooking up a high voltage and current device like this incorrectly could be severe a simple one-page data sheet should be included.Overall, I like the device. I am not going deduct a star for the minor issues noted in the above paragraph. But, if these two points were corrected the device would be perfect. It is a very nice solid-state relay, which is really what we are evaluating.
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