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SPECIFICATIONSainSmart 5V solid state relays per channel 250V 2A, output with resistive fuse 250V 2A
- 8 channel 2 AMP Solid State Relay board Good for lighting- holiday displays etc
- The input control signal voltage: (0-0.5V LOW solid state relay OFF) (2.5-20V high solid state relays ON)
- Rated output load: 2A at 100 to 240VAC (50/60Hz)
- Load voltage range: 75 to 264VAC (50/60Hz)
- Load current: 0. 1 to 2 AMP
- Power supply: 5VDC / 160mA (all channel ON)
- Load type: General purpose
- Isolation: Phototriac
- Zero cross: Yes
Use it to control various appliances, and other equipments with large current.
It can be controlled directly by Microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).
Product Dimensions: 155 x 55 x 24 mm
Very easy to use with an Arduino. Just needs 2 wires for GND + 3.3V and 8 wires for the 8 relays. You can use the newer arduinos that are in 3.3 V logic or a Raspberry Pi GPIO (also in 3.3 V logic) or any of the older Arduino (Uno, Mega) which are 5V.
The outputs relays are silent -- search "OMCRON G3MB-202P" for the datasheet.
These are zero-crossing PhotoTRIACs with snubber circuits. Their load rating is up to 2 A at 100-250 VAC.
Works fine with low-voltage 16 VAC too, for example model train accessories power supply.
[Edit] To clarify one thing: the solid state relays use triacs (TRIAC=triode for alternating current) which means the relays will only close when using an AC load. You cannot drive a DC load with these. If you like a schema to understand things, consider this:
[arduino] ---[3.3V or 5V DC]---> [SainSmart SSR] <---[AC]---> [Circuit to be controlled]
The outputs per relay only have 2 screws for an NO connection.
If you need an application with NO/NC or if you need to drive a DC load, you may want to try the 5 V SainSmart 8-Channel Relay Module.
- DC +: positive power supply (by relay voltage power supply)
- DC-: connect power negative
- CH1: 1 relay module signal to trigger the end (high level trigger effective)
- CH2: 2-channel relay module signal to trigger the end (high level trigger effective)
- CH3: 3 relay module signal to trigger the end (high level trigger effective)
- CH4: 4-channel relay module signal to trigger the end (high level trigger effective)
- CH5: 5 relay module signal to trigger the end (high level trigger effective)
- CH6: 6-channel relay module signal to trigger the end (high level trigger effective)
- CH7: 7 relay module signal to trigger the end (high level trigger effective)
- CH8: 8-channel relay module signal to trigger the end (high level trigger effective)
Works Great, Poor Workmanship, Wrong Specs, Relatively Pricey
Most importantly, this relay seems to be working great. I am using it for a 24 VAC sprinkler system controlled by a Raspberry Pi and it's working just fine. It's much easier to use than the low-trigger 8 port relays -- no need for pull-up circuits, etc., just connect +5V, GND, and one control pin per port and you're set. However, the workmanship is kind of poor. As you can see from the attached photo, there are at least a couple of problems: 1) the blue connector bar is not straight (no big deal, but noticeable), and 2) more frustratingly, the holes in the corner are not drilled in a consistently location, i.e. they vary up to 1 mm from the top/bottom and left/right edges (making it tough to 3-D print a good enclosure). The specs say the board is 155mm x 55mm, but it is actually more like 128mm x 61mm (an odd size if you ask me). Finally, this costs about twice as much as a low-trigger 8-port relay. Oh well. For me the convenience of the high-trigger is worth it.