---
product_id: 133918338
title: "TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink"
brand: "twtade"
price: "4882 som"
currency: KGS
in_stock: true
reviews_count: 13
category: "Twtade"
url: https://www.desertcart.kg/products/133918338-twtade-ssr-40-dd-40a-dc-3-32v-to-dc
store_origin: KG
region: Kyrgyzstan
---

# 40A max current capacity Wide input/output voltage range Includes efficient heat sink TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink

**Brand:** twtade
**Price:** 4882 som
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay cool, stay powerful — the SSR that means business!

## Quick Answers

- **What is this?** TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink by twtade
- **How much does it cost?** 4882 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/133918338-twtade-ssr-40-dd-40a-dc-3-32v-to-dc)

## Best For

- twtade enthusiasts

## Why This Product

- Trusted twtade brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Thermal Mastery:** Comes with a robust heat sink to keep your system cool under pressure
- • **Voltage Versatility:** Operates seamlessly from 3-32V input to 5-60V output DC range
- • **Plug & Play Simplicity:** Surface mount design with screw connectors for easy installation
- • **Powerhouse Performance:** Handles up to 40A DC current for heavy-duty applications
- • **Durability You Can Trust:** CE, RoHS, and UL certified for industrial-grade reliability

## Overview

The TWTADE SSR-40 DD is a solid state relay designed for DC to DC switching with a maximum current rating of 40A and input voltage range of 3-32V DC, outputting 5-60V DC. It includes a high-quality heat sink to manage thermal load, ensuring reliable long-term operation in industrial and scientific applications. Certified by CE, RoHS, and UL, this relay offers robust performance and easy installation with screw connectors and surface mount design.

## Description

TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink: desertcart.com: Industrial & Scientific

Review: Good relays after a year of use - I have two of these in enclosed but outdoor locations. Working well after over a year.
Review: So far so good - 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.

## Features

- Special attention: The current of this product is 10A for a long time.A large heat sink or fan need to be added.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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B079BGGVYX |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #70,489 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #19 in Solid State Relays |
| Brand | TWTADE |
| Coil Voltage | 3 Volts (DC) |
| Connector Type | Screw |
| Contact Current Rating | 40 Amps |
| Contact Type | Normally Open |
| Current Rating | 10 Amps |
| Customer Reviews | 4.1 4.1 out of 5 stars (606) |
| Date First Available | January 25, 2018 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 5.9 ounces |
| Item model number | SSR |
| Manufacturer | TWTADE |
| Material | Copper |
| Maximum Switching Current | 40 Amps |
| Measurement System | Imperial, Metric |
| Minimum Switching Voltage | 3 Volts (DC) |
| Mounting Type | Surface Mount |
| Operation Mode | Automatic |
| Package Dimensions | 6.22 x 4.06 x 2.4 inches |
| Part Number | SSR |
| Size | DC to DC 40A |
| Specification Met | CE, RoHS, UL |
| UPC | 635648190440 |
| Wattage | 32 watts |

## Product Details

- **Brand:** TWTADE
- **Connector Type:** Screw
- **Contact Type:** Normally Open
- **Current Rating:** 10 Amps
- **Mounting Type:** Surface Mount

## Images

![TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink - Image 1](https://m.media-amazon.com/images/I/71UOK23ftuL.jpg)
![TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink - Image 2](https://m.media-amazon.com/images/I/71hQj2UM-fL.jpg)
![TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink - Image 3](https://m.media-amazon.com/images/I/61y300cvWNL.jpg)
![TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink - Image 4](https://m.media-amazon.com/images/I/61Kk6QIjJEL.jpg)
![TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink - Image 5](https://m.media-amazon.com/images/I/61tzGnPctmL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good relays after a year of use
*by S***E on November 24, 2025*

I have two of these in enclosed but outdoor locations. Working well after over a year.

### ⭐⭐⭐⭐⭐ So far so good
*by R***E on October 5, 2022*

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.

### ⭐⭐⭐⭐⭐ It works reliably for one year now
*by P***D on May 8, 2021*

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.

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-19*