CrocSee Miniature Current Switch, CS-TS0, Normally Open Amp Sensor Monitoring Relay, AC 1-50A Detectable

Used for automatic shop vac switch for my jobsite table saw dust collection. Works perfectly. I used the contacts on the sensor to energize the coil of a power relay for actually switching the shop vac.

These are really slick. I used mine to detect that my compressor is running so I could turn on a fan (that is powered by a different circuit) that cools the air going from the pump to the tank (an aftercooler for all ya shop nerds out there). This was really convenient and saved me from having to install a relay. You should note that you'll need a small electrical enclosure or junction box to house this safely in.I do not consider this component 'industrial grade' - I work in the world of manufacturing equipment and I wouldn't put it on customer equipment - but it's built well enough for DIY usage if you are familiar with electrical wiring and apply it safely (proper branch protection, enclosed, and the like), it should be just fine. I did not observe any indication that it is UL or ETL certified. If you do require that sort of certification, I'd head on over to Automation Direct for a certified version that is blue but looks otherwise identical (and carries a higher price tag to boot).

Worked great for me. I used it to switch a 120v computer fan to vent a cabinet with a microwave in it.Fits into a 4-11/16 box.Unknown if it will last. We will see.

It works fine for controlling UV lights in an air handler. The following important information is in the Amazon description but NOT in the instructions:“NOTE: If you want to test the operation of the sensor switch, a load must be applied across the NO contacts; otherwise, it will not work.”

Power for my submersible well pump controller and my water treatment chemical feed pumps were all wired to a float switch in a cistern contact tank. The pumps would all operate whenever the float switch dropped, feeding well water and chemicals into the tank. This is a fine arrangement unless the well runs dry. If the well ran dry, the pump controller would shut off the submersible pump (as it should) but the chemical pumps would still operate, saturating the cistern with the chemicals until the well recovered and the float switch raised. This CrocSee current switch was just what the doctor ordered to easily fix this issue.This current switch now surrounds one leg of the submersible pump's wire downstream of the pump controller. The switch interrupts one leg of the power feed to the two chemical feed pumps. Now when the submersible pump runs, the current switch detects the presence of power to the submersible pump and closes the contacts, operating the chemical feeds. If the well runs dry, the pump controller cuts power to the submersible pump. The current switch detects the absence of power to the submersible pump and opens its contacts, stopping power to the chemical pumps. No more chemical saturation of the cistern when the well runs dry.Interrupting one leg of the 220 volt feed to the chemical pumps stops their operation. The switch does not heat up during operation and switches power quickly. I am pleased with this product -- a $20 solution that saves a million-dollar headache.

I wanted a way to have an air sanitizer for my HVAC system only come on when the blower was on and this was the perfect solution. Only took about 20 minutes to install and works exactly as expected

Installed it, it didn't work, took it out, tested with two setups, increasing the current flowing through the core from 1 to app 15+A (coiling the live or the neutral only, not that it matters, but I started doubting myself) with resistive loads (first a conventional lamp, then a heater, measured the current flowing through the loop with my clamp ampmeter) - the contacts would not close. This will cost me few days of delays and hundreds of wasted time for doing install twice. Think twice. If your time is worthless or you project can be interrupted and delayed - this can still be a choice. Specs are exactly what I needed.

I used several to design and build a pump sequencer for my basement sump. This is mission critical for me because my basement will flood within hours with no pumps. I use them to detect the pump running current and sequence them from primary, to secondary, to both and to trigger an alarm if a pump fails to run when needed. Using them to sense pump current allows me to use self-contained pump+switch units without having to wire and adjust separate floats.And they work extremely well! They have a built-in low pass filter to prevent spurious turn-on or turn-off and their sensitivity and accuracy is quite good.Potential users should note that these units use a triac output switch and so must switch line voltage AC at less than 2.5 amps. Like most triac designs they have an internal RC snubber network to prevent false triggering. This means that there will be some leakage current, so if you are driving a very low current load like an LED or neon indicator lamp (like me), you will need to add a load resistor across the lamp so it doesn't glow dimly. If you need to have no leakage or switch low voltage, use a 120 volt relay to create a set of dry contacts.All in all, they are well made and an awesome value. They were a great find.