Current Sensing Relay AC Current Sensing Switch 0-30A Normally Open Current Sensor Monitoring Relay (M3050)

Works as advertised and is small (doesn't take up space). I wanted to detect each time a pump ran which then went to a totalizer/counter. Worked perfectly!

The media could not be loaded. This is a fantastic relay!I am going to use it to prevent power from flowing to my pool's booster pump when the main pump is not operating. When this relay senses power flowing to the main pump, it will trigger a second relay that will allow the booster pump to run.I need the second relay because this relay cannot handle a load exceeded 0.3 amps and my booster pump draws 4.5 amps.I put together a testbed based on 120V to verify that it works as described, and indeed it does:1. It is described as "self-powered" and that is consistent with my experience. I assume it is inductively drawing a small amount of power from the current it is sensing and uses that to power the LEDs.2. The threshold setting works as expected. I tested with a 3-speed, 20" box fan. I was able to adjust the sensitivity such that the relay was "off" when the fan was on low and "on" when the fan was on medium.The video demonstrates all of this with nothing attached to K1 and K2. I also ran a test with a 120V, 8 watt LED bulb connected between K1 and K2. The bulb turned on and off at the appropriate times.Highly recommended!

I tried M3066 and M3056 at various amperages @ 120V, and the relay never changed.I varied the amperage from .3A to 13A, and no change in either current switch.The adjustment screw was turned each way with no results.The 3066 stayed open and the 3056 stayed closed.

The media could not be loaded. I realize I bought the wrong one, but it still does what it is supposed to do. I would have been nice it it had both a normality open and a normal closed connection that way it will ether one. Its activation current is adjustable as it says. The LEDs light up as long as there is a current flowing through the wire. It is meant for sensing a circuit that alway has current flowing the it. This way it will change when the current goes above the threshold that is set by the technician/user.

I bought this to control a load share contactor. I wanted a 50A unit so I could change to a high current threshold if needed later although it would normally be run well below this level. I was easily able to adjust threshold to below 24A where it would normally be used but could not get it as low as 5A. I did not investigate minimum levels further.The LEDS make it easy to use and I could drive the contacter coil directly whiich is very helpful.One iissue is the device does not have any hysteresis built in, this means if operating is around the threshold current it can cause the contactor relay to chatter rather than switching positively. Depending on application this may wear out the contactor or relay prematurely and may not be good for the load either.

Great little device! I bought 5 of these to automate the opening of my blast gates when a power tool turns on in my home workshop. One of 5 did not work; it was replaced the next day. Now they all operate as expected and I am a happy wood worker.

Worked perfect for current sensing logic on my ESP8266. Adjustable trigger point. (They give you a tiny screwdriver for adjusting it.) Self powered LEDs. A couple mounting screws, and a manual showing wiring diagrams for several different applications. Yeah!

It was easy to install. I use it to monitor if my spa heater is running.