A solid state relay (SSR) allows you to control high-curent AC loads from lower voltage DC control circuitry. Solid state relays have several advantages over mechanical relays. One such advantage is that they can be switched by a much lower voltage and at a much lower current than most mechanical relays. Also, because there’s no moving contacts, solid state relays can be switched much faster and for much longer periods without wearing out.
This particular SSR can switch current loads of up to 40A with a 3-32V DC input and a zero cross trigger control method. Each one of these relays is equipped with four screw terminals (for use with ring or fork connectors) and a plastic cover that slides over the top of the relay to protect the terminals.
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These solid state relays are controlled by a 3-32 DC signal on the input, but the output must be connected to AC. If you connect them to a load that's powered by DC current, you can turn the relay on, but you can not turn the load back off again without disconnecting power elsewhere from the load.
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Based on 36 ratings:
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I have it driving two stove eyes in a homemade oven. It handles it with no problems and no heat even without a heatsink
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Picked up several of these when I was planning my home automation system. What I liked was that it was able to work with the raspberry pi at 3.3v without a problem. a lot of the other relays i looked at needed 5v for input. with this one I was able to connect it to a GPIO pin and when that pin went high the relay turned on. no muss no fuss. I have sence switched to esp8266 modules and it works with them as well.
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I originally bought another very similar SSR, also rated for 3~32VDC on the control side. However, it wouldn't actually activate from the 3.3v digital pins on my Arduino. It needed closer to 5v to activate. So, I ordered this one. It worked perfectly as soon as I wired it up. Now I can digitally control my brewing mash temps! Hooray!
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This SSR is suitable to switch with out click sound and high power consumption product like heater, Thank you
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I've used a few of these with PID controllers to switch heating elements (in a sous vide cooker, and an espresso machine, both 120 V AC) -- it handles lots of AC current, silently; even with high loads, the SSR doesn't get very warm. My sous vide cooker is about 1200W, and when the full load is going through the SSR as it initially brings things up to temp, it still isn't hot to the touch. It's easy to put a radiator on the back - there's a nice metal plate, just add a couple mounting screws and some thermal paste - but I haven't needed to do so.
The input is easy to switch with an Arduino or other 5V microcontroller output, to control e.g. heaters, pumps, lights.
The indicator LED is useful to check that the SSR is getting the control signal. The screw terminals work nicely with either bare wire or spade connecters.
The one I have in my espresso machine is inside the machine's case, and routinely sees 220 deg F; the heat so far has not affected functionality at all. This is a robust device, at a good price.
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Running two relays with only 11amps at 240V, these relays (2 of them) had the sides of the housing slightly melted and literally burned black rectangles into the plywood piece they were bolted to. So whoever said you don't need a heat sink in the other reviews...think again! Buy a version with a brand name, like Omega and follow their instructions, which say to use a sink. Or at least bolt them to an alum plate. If i could post a pic here of the burnt wood and melted housings, I would.
Sorry to hear you've had trouble with the solid state relay. I don't know who told you that a heatsink wasn't required, but they were incorrect. Any solid state relay that's controlling more than a few watts will need a heatsink.
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I used an Arduino Nano with one of these to build a cycle timer. This unit is sturdy and built really well. Mounting is easy and the terminals are full size so you can simply split right off the power cord very easily with the peace of mind that the connections will remain solid.
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I've used this with 5V DC from Arduino to switch on/off a light at 240 VAC and (separately) an irrigation system at around 30 VAC. I like the heat sink and plastic cover for safety. Also easy to wire up.
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Did not cause unnecessary troubles.
We bought 35 pieces but haven't had a chance yet to put them to work. However, your handling of our order and shipping was 5 star!
I needed an easy way to disconnect RV power after I had already climbed into my bunk. This unit combined with a micro switch is a perfect solution!
Very solid stuff ;)
Everything worked out great
Bought this relay to control an espresso machine heating element. I was concerned about heat because I mounted the relay inside he machine, but I have had no problems. I also really like the design and quality of construction. Couldn’t ask for better.
Was able to switch mains AC power with an Arduino UNO using PWM. Worked perfectly for what I needed.
I have used the relay extensively for two weeks now and have had no issues. I am switching two legs of 240 volt AC for a well pump. I am using the relays so the pressure switch contacts will last longer. As I said, so far so good. I have the relays mounted on a heat sink appropriate for 15 watt heat dissipation. For safety reasons, remember almost all solid state relays have some leakage current when in the off state. The relays are a good value and work well.
Like all SSR's don't run them at the rated current, they will get hot and sometimes not shut off. Mine are running at less then 20amps and work very nicely.
This relay is the switch between an arduino and a space heater. Been using it a couple weeks now, and it is functioning perfectly.
I had a couple of the $US5 "Fotek" fakes I got off Ebay. Although they didn't burn up they failed on for my application in hours or days. They failed in the "on" state which was disconcerting. I ordered one of these as a trial and so far is operating fine after several months of continuous use and a year later.
The application is a cheap PID temperature controller maintaining a water tank temperature as part of a hydronic heating system. The SSR is installed with a heat sink and some attention to the instructions. The load being switched is a 4800W immersion heater at 240V. So far so good.
After a year of use I figured it was safe to offer some feedback as most folks are running << the rated current/power of the device I find.
Great product. Did exactly what I wanted
but I bought 2 more. I've used similar types in the past. I'm putting them in fluorescent ceiling light fixtures so that when the projection screen is lowered the lights go off.
Maybe works for 40A but for my light load it has too much leakage current and the load partly runs when OFF. Just check the data sheet before selecting it--it says 3mA leakage. I didn't measure it, but with an LED lamp attached, it could charge up and flash the lamp every 5 sec when OFF. This may be typical and no fault of this particular SSR.
Using a toaster oven that draws about 10 amps AC at 120 volts. I turn the oven on and off with variable duty cycle on a 1 second cycle time. Driven from a raspberry pi. Has been working perfectly!
Low power required for low voltage circuit. Nice. The power dissipated in the high voltage circuit is not too bad. An 18" aluminum bar does the trick.
These SSR's work great with a properly designed circuit. I will order them again.
Good price for this item!
Our MakerSpace has a classroom where the only light switch is at the opposite end of the room from the entry. As it would not be easy or inexpensive to re-wire the lighting and it is a MakerSpace, I decided to fabricate an IOT solution using a pair of Particle Photons, this SSR and a NO push button. This relay works as advertised, is completely silent and runs cool to the touch. The 3.3VDC output from the Photon activates the relay every time and the Particle cloud is easy to use and monitor. For remote switching of non-trivial AC applications, this relay can't be beat.
I used this item to build a controller for my woodworking shop vacuum. Activates well with only 3vdc current, and handles the large AC current fantastically
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Wired this into an outlet box to turn on outlets using the 12V trigger from my surround sound receiver. This way my subwoofer would turn on and off with the receiver using a Crown Power Base 2 amplifier.
A nice solid state relay. Mind the leakage current, if that sort of thing matters to your project. I've hooked these up to Raspberry PIs and ESP8266's no problem.
Connecting it to an ESP8266, and a HDT22, I was easily able to make my own 'Nest' device to control the power to my AC unit for about a year now.
It works well, and is silent. with the sealed design and high amperage capability, I am purchasing more of them to add control over my baseboard heaters next!
Just make sure to have a DC power supply hooked up to the Arduino and it works great. If you try to run 2 off the Arduino with only the USB it can't quite power them. Been using it with 120v 60hz and now 50hz without issues.