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SainSmart 8-Channel 5V Solid State Relay Module Board for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC

4.1 out of 5 stars 89 customer reviews
| 13 answered questions

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  • Has been assembled, and electrical test passed.
  • Led indicator for each relay.
  • FR-4 Fiber glass PCB (Double Layer); Size: 155 x 55 x 24 mm (approximately 6.1 x 2.17 x 0.95 inch)
  • Input control signal voltage: 0V - 0.5V Low stage (SSR is OFF), 0.5V - 2.5V (unknown state), 2.5V - 20V High state (SSR is ON); SSR Output (each channel); Load voltage range: 75 to 264VAC (50/60Hz); Load current: 0.1 to 2 AMP
  • Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)
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  • SainSmart 8-Channel 5V Solid State Relay Module Board for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC
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Size: 8-CH
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Product Features

Size: 8-CH
  • Size (LWH): 5.9 inches, 3.14 inches, 1.57 inches
  • Weight: 3.2 ounces
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Product Description

Size: 8-CH

Specifications SSR Output (each channel) Load voltage range: 75 to 264VAC (50/60Hz). Load current: 0. 1 to 2 AMP. Power supply 5VDC / 160mA (all channel ON). Input control signal voltage: 0V - 0. 5V Low stage (SSR is OFF) 0. 5V - 2. 5V (unknown state). 2. 5V - 20V High state (SSR is ON). SSR Spec. Manufacturer: OMRON Part number: G3MB-202P, 5V version. Isolation: Phototriac. Zero cross: Yes. Rated output load: 2A at 100 to 240VAC. (50/60Hz). Load type: General purpose.

Product Information

Size:8-CH
Product Dimensions 5.9 x 3.1 x 1.6 inches
Item Weight 3.2 ounces
Shipping Weight 3.2 ounces (View shipping rates and policies)
ASIN B006J4G45G
Item model number 101-70-111
Customer Reviews
4.1 out of 5 stars 89 customer reviews

4.1 out of 5 stars
Best Sellers Rank #5 in Industrial & Scientific > Industrial Electrical > Controls & Indicators > Relays > Solid State Relays
Date first available at Amazon.com December 7, 2011

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Customer Reviews

Top Customer Reviews

Size: 8-CH Verified Purchase
As an electronics hobbyist, I am planning to design my own Christmas light show this year and dreaded the idea of having to build boards with relays on them that could be controlled by my Arduino. This board has all the features I could possibly want, and it's designed better than what I would have done at a fraction of what it would have cost me to do.

NOTE: This uses a triac; so it's not going to work for switching on direct current loads. I verified that with a quick test. It works great for AC loads, but is not designed for DC loads. If you need to control DC loads, then you'll want to purchase the mechanical relay board also made by Sainsmart.

A schematic of how each relay is wired is given at the Sainsmart website. Based on that and some measurements I've made, here are some features that aren't obvious from the description.

1. Each relay is protected by a fuse. Granted, the fuse is hard-soldered to the board; so if you blow the fuse, you'll have to de-solder and re-solder a new fuse in place, but that's not a huge problem. Protects each circuit from drawing more than the 2 amps that the relay is rated for.

2. The signal from the Arduino doesn't cut on the relay directly. Instead, the signal from the Arduino turns on a transistor, which closes a circuit that turns on the relay. The relay itself is optocoupled; so there is plenty of electrical isolation between the Arduino board and the relay. No worries at all on my part about frying my Arduino board.

3. Each relay draws about 10 milliamps from the Arduino when switched on. If you're only turning on a few relays at the time, that is not a problem for the Arduino to handle.
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By Big John on November 18, 2012
Size: 8-CH Verified Purchase
I overloaded the circuit and blew one of the fuses. This is not the fault of the board, it is my fault. Anyway the fuses were a little harder to find than just going to Radio Shack and picking one up. I found them over at Mouser. Here is the part number for anyone looking for more fuses.

Mfg. Littelfuse
Part # 0251002.MXL

[...]
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Package Type: Standard Packaging Verified Purchase
The relay interfaced nicely with the raspberry pi and seems to work great. Being solid state there's no audible "click" when you trigger the relay which is nice. LED indicators let you know if a particular relay is active or not. I have another SainSmart 5V 2-channel relay (not solid state -[...] and the problem I had with it was that it was ACTIVE LOW (no a defect, but by design). So, whenever my raspberry pi rebooted and the signal on that GPIO pin dropped to LOW, the relay triggered (which is not what I wanted).

But, with this Solid State version, it is ACTIVE HIGH, so a reboot or power outage of the Pi does NOT trigger the relay (which is what I want). This is a great relay and I highly recommend it if the specs fit your needs.
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Size: 8-CH Verified Purchase
I used this module to replace a mechanical relay module from Sainsmart for my Xmas light display outside. The mechanical relays didn't last long last year. So far this year the solid state relays are giving me no troubles. One thing to note however, mechanical relays can typically handle 10 Amps each. These solid state relays can only handle up to 2 Amps each ... enough power for approximately 100 LED lights on each relay, or 800 total lights per relay module. More than enough to dazzle (or cheese-off) the neighbors! No complaints about this board.

Update: Well, it's a few days past Xmas and not a single problem from any of the SSRs. I love that I can program the outlets to turn on and off at less than 25ms (the limit I found for mechanical relays). This allows twinkling effects that I couldn't do with mechanical relays. I'm purchasing another one for a 16 channel setup and adding a San Devices e682 to the mix for RGB LED control as well (my neighbors will REALLY love me next year). I use an Arduino Uno to control the relays however any microntroller with at least 8 digital outputs will work well with this relay board.
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Size: 8-CH Verified Purchase
Simple and straight forward. I use this connected to a Raspberry Pi, with an external 5v adapter, and 120V AC sockets attached to each relay. No transistors necessary, connected GPIO pins from the Pi to the numbered terminals on this board, 5v power to the 5v terminal, and ground to both GND terminals. To wire AC current on the switched side you can connect either the AC/mains common OR the hot, I prefer to go with the common. When GPIOs are switched to high, the relay turns on, and an LED on the board turns on for each relay.
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Size: 4-CH Verified Purchase
I purchased this to control a CrockPot for sous-vide cooking. Initially it worked perfectly, but after a few initial test runs I noticed that the relay seemed to constantly be stuck in the "on" position. Upon close inspection, the relay I was using had a "bubble" on the side and had clearly failed.

These relays are rated for up to 2A - and they mean it. My crock pot was pulling ~2.1A when on, which apparently was enough to cause the relay to fail.
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Size: 8-CH Verified Purchase
Initially bought this to replace the one I had from last year on my Raspberry Pi light show. Turns out that I didn't need it. I thought I blew a few of the switches on the old solid state switch but I was wrong. I will be using this next year to get 16 channels out of my light show. The module is a lot more reliable that I initially thought.
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