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Inkbird SSR Solid State Relay SSR 40DA for PID Thermostat Temperature Controller

4.4 4.4 out of 5 stars 281 ratings
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Amazon's Choice in Solid State Relays by Inkbird

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Purchase options and add-ons

Current Rating 40 Amps
Brand Inkbird
Wattage 3500 watts
Contact Current Rating 40 Amps
Maximum Switching Current 40 Amps

About this item

  • Input : DC 3-32V;
  • Output : AC 24-380V
  • Solid State Relay
  • Type : SSR-40DA
  • 1 x Solid State Relay
See more product details

Customer ratings by feature

Temperature Control
4.3 4.3
Value for money
4.2 4.2

Frequently bought together

$12.29
Get it as soon as Monday, Apr 1
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Sold by LERWAY Tech. and ships from Amazon Fulfillment.
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$39.99
Get it as soon as Monday, Apr 1
In Stock
Sold by Inkbird and ships from Amazon Fulfillment.
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$14.99
Get it as soon as Monday, Apr 1
In Stock
Sold by LERWAY Tech. and ships from Amazon Fulfillment.
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Inkbird SSR Solid State Relay SSR 40DA for PID Thermostat Temperature Controller
Inkbird SSR Solid State Relay SSR 40DA for PID Thermostat Temperature Controller
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Details
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Price$12.29$10.99$10.90$9.79
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Temperature Control
4.3
4.4
4.4
Value for money
4.2
4.4
4.4
Easy to read
3.6
3.6
Sold By
LERWAY Tech.
Aobao US
CGELE Official Store
Sumiempaques, Corp.
contact type
Normally Open
Normally Open
Normally Open
max switch current
40 amps
40 amps
40 amps
25 amps
specification met
Electromagnetic Compatibility
Electromagnetic Compatibility

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Product Description

Note: A heatsink must be used or it will get burned out.

For sale is a 40A Solid State Relay (SSR).

It's good for heater, oven, or other appliance up to 3500Watt power consumption. Ideal for PID temperature controller.

Specification

Input: 3V-32V DC

Control: 24V~380V AC

Current: 40A

Packge:

1 x solid state relay 40A


From the brand

Product information

Technical Details

Additional Information

Warranty & Support

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Product Warranty: For warranty information about this product, please click here

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Inkbird SSR Solid State Relay SSR 40DA for PID Thermostat Temperature Controller


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Important information

Wattage

3500 watts

Bulb Voltage

24 volts

3 volts

Customer reviews

4.4 out of 5 stars
4.4 out of 5
281 global ratings

Customers say

Customers like the versatility and quality of the relay. For example, they mention it's a great relay for heating elements and runs nice and cool with a heatsink. That said some complain about the closure issues. Opinions are mixed on performance.

AI-generated from the text of customer reviews

4 customers mention4 positive0 negative

Customers find the relay versatile. They say it runs cool with a heatsink and a fan blowing across the heatsin. They also say it's simple to wire and mount, and is a great relay for heating elements. Customers also mention that it didn't have an issue with over heating.

"...passing a continuous 16A at 120VAC for one hour the SSR was not even warm to the touch...." Read more

"...first try I put a 7amp load for about 15 minutes and did not have an issue with over heating...." Read more

"...It runs nice and cool with a heatsink and a fan blowing across the heatsink. Switches on and off perfectly...." Read more

"...Simple to wire and mount. A great relay for heating elements." Read more

3 customers mention3 positive0 negative

Customers are satisfied with the quality of the relay. They mention it's a reliable, sturdy little component, and has good quality.

"...Switches on and off perfectly. The terminals are solid, hold anything from a small spade connector to bare 10 ga wire just fine,..." Read more

"Reliable..." Read more

"Good quality and no failures for constant usage...." Read more

3 customers mention3 positive0 negative

Customers appreciate the value of the relay. They mention that it is a great product at a good price.

"...Pros● Small and compact in size and weight● Good cooperative priceCons● No heat sink grease included" Read more

"Good price Quality Item" Read more

"Great relay, great price!..." Read more

22 customers mention14 positive8 negative

Customers have mixed opinions about the performance of the relay. Some mention that it works well, runs nice, and has no failures. Others say that it arrives non functional, fails, and does not work with the bell.

"This works perfect for my smoker. Thank you so much" Read more

"...Dead right out of the box. No output. Input LED light works but that's it." Read more

"...when a gate is open and since there is a gate at each tool, it is very efficient." Read more

"Worked on first try I put a 7amp load for about 15 minutes and did not have an issue with over heating...." Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the closure of the relay. They mention that it fails to close and gets stuck closed.

"...and regardless of the LED status light, the output circuit is always closed, causing the connected device to run continuously...." Read more

"Worked for about a week and now it gets stuck closed sometimes. You get what you pay for." Read more

"Failed closed, fire hazard, less than 40a under 30 min..." Read more

Use a heatsink!
5 Stars
Use a heatsink!
I think all the people melting their SSRs didn't get the memo about using a heatsink, although it's written in the product description. I mounted mine to an old CPU heatsink with fan, and after passing a continuous 16A at 120VAC for one hour the SSR was not even warm to the touch. The relay also responds as expected to a 12VDC PWM signal, switching on and off my 120VAC load as expected.I don’t know if this relay has counterfeit TRIACs in it, I don’t know if it could handle anywhere near a 40A load, but if you’re using a cheap SSR like this you should probably plan to run it at a fraction of its rated current with an oversized heat exchanger. Luckily, 16A is the max current of most home circuits in the US, so this should be adequate for most uses, unless you start getting funky with your wiring. Just make sure you’ve got a way to remove the heat and this thing should do you well.
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Top reviews from the United States

Reviewed in the United States on July 28, 2023
Reviewed in the United States on March 14, 2024
Reviewed in the United States on June 5, 2020
Customer image
5.0 out of 5 stars Use a heatsink!
Reviewed in the United States on June 5, 2020
I think all the people melting their SSRs didn't get the memo about using a heatsink, although it's written in the product description. I mounted mine to an old CPU heatsink with fan, and after passing a continuous 16A at 120VAC for one hour the SSR was not even warm to the touch. The relay also responds as expected to a 12VDC PWM signal, switching on and off my 120VAC load as expected.

I don’t know if this relay has counterfeit TRIACs in it, I don’t know if it could handle anywhere near a 40A load, but if you’re using a cheap SSR like this you should probably plan to run it at a fraction of its rated current with an oversized heat exchanger. Luckily, 16A is the max current of most home circuits in the US, so this should be adequate for most uses, unless you start getting funky with your wiring. Just make sure you’ve got a way to remove the heat and this thing should do you well.
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Customer image
Customer image
13 people found this helpful
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Reviewed in the United States on September 1, 2023
Reviewed in the United States on November 21, 2011
8 people found this helpful
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Reviewed in the United States on August 17, 2023
Reviewed in the United States on January 29, 2024
Reviewed in the United States on June 1, 2020
6 people found this helpful
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Top reviews from other countries

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Claudio Carletta
4.0 out of 5 stars Ottimo.
Reviewed in Italy on June 4, 2017