Dwyer® Miniature Current Switch, MCS-111050, Solid Core, .5 to 50 A Continuous

I combined this adjustable trigger current switch with a time-off delay relay so I can run an auxiliary duct fan on my wine refrigerator for two minutes after it's cooling unit's compressor shuts off. I have this switch adjusted such that when the compressor comes on, the aux. fan does too, and when the compressor shuts off, the aux. fan runs for two more minutes (exhausting remaining heat from the condenser), then shuts off. This works really well!I also appreciate its UL rating.I am using two wraps of the Hot side of the AC load line, through the 8mm CT hole, as I do not need 50A adjustable sensing capability and 25A max adjustment range is more than plenty here , and this also reduces the adjustment pot's sensitivity and theoretically lowers the low-end threshold, though that's also not an issue in my setup. I will note that I never see the green LED lit; perhaps my cooling unit's idle power consumption is not enough to power the module? As I don't need the green LED indicator, it's not a concern to me, but it bears noting.At this time, it's only been in use for a week; I will update this review if problems arise.

Place a conductor through the hole to monitor the current. The switch has normally open contacts that close when the current set point is reached. The set point is adjustable via a potentiometer. Rotate the potentiometer counter clockwise to lower the set point, clockwise to raise it. The contacts cannot handle higher currents for motors. A secondary relay was required for my application. I used an Omron, G7L-1A-BUBJ-CB-AC100/120 relay.I use the Dwyer, MCS-111050 to monitor the circuit current of my dryer. When the dryer is on, the contacts close, power is applied to the relay coil energizing the relay, closing the contacts, turning the booster fan on.Due to a long dryer vent, I installed the Fantech DBF 110 Dryer Booster Fan a year ago. It worked well and reduced my drying time. However, the pressure switch design needs improvement and was problematic. The motor worked great when the system decided to work correctly. I bypassed the pressure switch and now the new current switch configuration turns the fan on after the dryer starts, instead of waiting for pressure to build to trigger the pressure switch.

The hole is so tiny that I couldn't loop my wire through the hole (it was a 15 AWG but with thicker than usual insulation and yes the wire was cut clean, nothing attached to it), but fortunately enough this little thing is sensitive enough, so I didn't need in the end to loop the wire. Can't speak to longevity as I just installed it few days ago to detect when the furnace blower is running.

Ok

I was pleased to come across this device as it was a perfect fit for my application. Unfortunately the first unit I ordered was doa. After returning I ordered a second one and it was also doa. I tried everything to make sure each was in fact not functional, ended up giving up as time wasted. Very frustrating, am going to try other products. Maybe I'll have better luck with them.

This is the perfect solution to the problem that I've had with my GE Geospring hybrid water heater. There was a huge design flaw that I don't think they ever figured out and what the problem comes down to is that the fan does not push the cold air out of the housing of the water heater. I installed an external fan and my water heater quit having problems. I needed this to "sense" when the heat pump would turn on so that I could run an external ducted fan. Perfect! Perfect! Perfect! Using this, all I had to do was run one leg of my water heater wiring through the sensor hole and not have to cut any wires or disassemble the water heater. Everything was installed without having to touch the water heater itself and considering that I'd be throwing away a ten year warranty, that was not a good choice. So, one external electrical box, one contacter, one 240v-120v power adapter to power the external fan and I was in business.

I was initially thrilled to find this; an adjustable current sensor with integral self-powered relay! During the installation (which required pulling wires and setting a new box to put this in) I found out that the relay terminals were so small I had to use pigtails to get the wires into them. When I powered everything back up, it worked just as advertised. To be specific, I had it switching a Panasonic FV-0510VS1 WhisperValue DC fan set for 100 CFM. This draws 0.2 Amps, well under the 0.3 Amps the Dwyer is rated for. As you can see from the photo, the Dwyer current switch melted; not a warm fuzzy feeling to find THAT in your attic! I pulled it out and replaced it with a Suncourt SW100 Current Switch. Time will tell!

I have solar pv panels and use this to light an LED bu my desk when the output from them is over 5A, I also use the switched output to apply power to a water heater via a contactor. (I'm net metered and only want to heat water when the PV is generating) Works perfectly, and several could be used set at different Amperages to activate various items as required.