Question 1

max wattage on 120v ac USA ?

Accepted Answer

There is a tough to find data sheet that does spec this unit at a max of 30vdc. Refer to this link for more info, http://electronics.stackexchange.com/questions/97721/why-ac-points-on-pcb-are-separated-by-a-holeThere are products that are very similar and rated for 120v ac use.

Question 2

Does it have optocoupler isolation?

Accepted Answer

No opto-coupled isolation. There is a small transistor onboard that is driving the relay and as someone else pointed out, the coil has a diode across it to supress the counter EMF of the coil. This relay requires very little to drive it as long as it's wired correctly ("+" to 5-12VDC, "-" to Ground, "s" to your digital output. The output is active high (when your output is high, the relay energizes). The screw terminals (NO = Normally Open, NC = Normally Closed, C = Common).

Question 3

How reliable are these? I bought one but it just died on me, the led lit but it wouldn’t switch anymore so I had to throw it away.

Accepted Answer

I've had two of these in service for over 2 years now with no issues.  They are each separately controlling garage door momentary switches.  They are each in  a circuit with an Arduino activated by bluetooth to start the garage door motor from the momentary switch.  They've worked great for me.

Question 4

Does this only work with official Arduinos?

Accepted Answer

No, it will work with anything that sends out a 5v digital signal (though I also had success with a 3v esp8266, so input tolerances are probably fairly wide )

ASIN	B00VRUAHLE
Brand	TOLAKO
Customer Reviews	4.5 4.5 out of 5 stars (381)
Date First Available	April 7, 2015
Hardware Platform	Arduino
Is Discontinued By Manufacturer	No
Item Weight	0.317 ounces
Item model number	BJ-DT0Y-001
Manufacturer	Tolako
Package Dimensions	3.07 x 2.52 x 0.67 inches

5v Relay Module 5V Indicator Light LED 1 Channel Relay Module for Arduino ARM PIC AVR MCU

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