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Your cart is empty.Product Description
Multi-parameter optional
High sensitivity of products
- Multi-environment application
Model: SSR-40DD
Brand Name：TWTADE
Model: SSR-40DD Solid State Relay 40A DC to DC
Input voltage: 3-32V DC Output voltage: 5-60V DC
Heat Sink Mounting Thread Diameter (Approx.) : 0.5cm / 0.19"
Heat Sink Total Size (Approx.) : 8 x 4.9 x 4.9cm / 3.1" x 1.9" x 1.9" (L * W * T )
Package Content: 1 x SSR, 1 x heat sink
Notice Of Use
1. The current on the product is the maximum load current, not the rated current.
2. On the basis of the different of the load character,you should keep the different allowance on the level of the current when you choose the product.(When the load is resistive, the load current should be 1/2-1/3 times of the max load current .When the load is inductive or capacitive,like motor， transformer， the load current should be 1/4-1/6 times of max load current.)
Alexander
2025-08-23 15:11:42
We used this to create an additional safety shutoff for a mobile solar power system. Our control circuit measures the battery voltages, and if any are over the tolerance setting, it cuts a small relay that then cuts power to this unit. This unit then faithfully disconnects the solar input, effectively preventing over-charging and increasing overall system safety.Unit has been in use consistently for several months now and has performed reliably. Our load is much smaller than it's rating though (about 10 Amps at ~30 volts), but the unit does not appear to get warm even while handling this.
Real Bill Nye
2025-08-14 12:09:25
I'm using two of these to control a 110v 1300watt heating pad that draws around 11amps and a 110v 550watt 5amp 635cfm exhaust fan. I havent ran the heating pad yet, but the fan does great. I have the heatsinks cooled by a 24v fan and 150c thermal fuses fixed to both of them in case they fail. If I ever have any issues, I'll report back with updates.Edit: I guess I should mention I'm triggering them with 24v DC off of a PSU. Low voltage side is negative from the SSR to the negative on the PSU and positive from the PSU to a switch to the SSR. 110v side interrupts the LINE wire for the exhaust fan.
PickGood
2025-08-12 12:39:12
I use it in the garage ceiling to control multiple LED light bulbs from the light output of the garage opener.It works reliably for a year now. As one may know, if you use LED bulbs for the garage opener light, it decreases the range of the openers (if they work at all) and in time it will burn the internal wireless controller of the garage door opener.The solid state relay I use it as a 'separator' to route the AC circuit of 3 LED bulbs directly from the 120V house circuit and command it with the garage door opener. I mounted it in the garage ceiling and almost forgot about it. Now my garage openers range from the cars is more than 150 ft.
RoboDisko
2025-07-23 10:04:32
I have about twenty of these built into temperature controller boxes now. They run almost continuously at around 50% duty cycle average for the last year or so. They are switching only about 2A of resistive current (on the 40A rated units) and they stay cool.They have been mostly reliable, but we have had a few fail. The ones that have failed have failed because we connected a shorted heater. A 15A fuse has proven insufficient to protect the SSR from this happening. When they have failed due to a short circuit, they have failed CLOSED, which is bad. This could be a big problem, depending on your application. Please keep this in mind!!Ultimately, the devices are cheap enough to consider an expendable, like a fuse. Just keep in mind that they seem to fail shorted and they are fairly delicate. I personally wouldn't run more than about 10A on the 40A rated ones.
Gideon
2025-07-12 19:32:20
Was running this to control power to my hot tub pump, triggered by my temp controller. The other day the pump stopped working, and when I popped the cover, found this nightmare fuel. The switched power is 110VAC coming off a 20A double protected GFI outlet so it is physically impossible that this came anywhere close to the claimed 40A limit. I count myself lucky that my house didn't burn down... I DO NOT RECOMMEND
Adam Atlas
2025-06-18 14:14:41
Fit no problem to the inside of a light fixture, triggerd by a 15amp wireless switch. Prior switch failed within a few months, this should last forever... update. Lasted maybe a few months. Physicly burnt inside. I was using it to control about 12 amps of florescent lights it burnt out quick and stayed on. Not good. Anyway no where near 40 amps lol
Sheran K. Stanaitis
2025-05-24 10:42:54
I gave this product 5 stars because it works very well. I am using 12 volts DC for the signal, so it operates very reliably and it works well, switching it on and off frequently over extended periods of time while controlling a load up to 35 amps or so into the inductive load of a 2500 watt ZVS induction heater running at 48 volts.However---- as others have said, the reference diagram is wrong and needs to be changed. Even the INPUT is listed as being AC!!!
A. Schwieger
2025-05-05 11:55:34
When all is said and done, I am, at least, able to get this to work. With just the main load attached, 35w at 120VAC, activating the relay does not start the load. If the load is then unplugged and plugged back in, then it will start. The intent of using this relay was to avoid having to do this so that is a fail. I did find that if I add more load to the output, a 7.5 watt light, then it does work. In communicating with the seller, they were unable to provide any detail about a better solution other than just returning the relay.
HardRockFan
2025-04-22 17:08:39
When the thermostat on the freezer would open (break the circuit between live from the wall and the compressor), some electronics would be impacted from the arc inside the termostat.I connected the SSR's switching side to the thermostat and the load between live from the wall and the compressor.No more interference with electronics now.
Client d'
2025-03-25 20:55:03
Remplacer l'original pour une fraction du prix
Client d'
2025-01-09 19:24:57
Fonctionne très bien
Robert Mitchell
2024-12-22 18:31:15
Works as expected
Rob
2024-12-18 09:16:27
out of 10 I purchased 5 failed already (within two weeks), 1 was failed closed before installed. I would not recommend these. spend a little more and buy a quality one. Not impressed. We are electricians installing them, so it's not us. Bought some better-quality ones and haven't had any issues. Buyer be aware.
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