Description: This non-invasive current sensor (also known as a “split core current transformer”) can be clamped around the supply line of an electrical load to tell you how much current is passing through it. It does this by acting as an inductor and responding to the magnetic field around a current-carrying conductor. By reading the amount of current being produced by the coil, you can calculate how much current is passing through the conductor.
This particular current sensor will measure a load up to 30 Amps which makes it great for building your own energy monitor to keep your power usage down, or even building an over-current protection device for an AC load. This sensor does not have a load resistor built in, so in most cases it will be necessary to place a resistor across the output to convert the coil’s induced current to a very small measurable voltage.
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Installed 2 of these to monitor current to heat pumps. Small size, split core design and long leads make installation easy in the elec panel but the thin plastic that acts as a hinge on the split core looks very weak. I used ‘zip’ ties to be sure they don’t open in the panel years from now.
I am using the cr magnetics design for a ‘precision rectifier’ to produce amplified DC voltage outputs with a ratio of 20mvdc/1Aac. Our typical 10Aac load produces 200mvdc output, easily monitored with an arduino.
The spec sheet uses a 10ohm load resistor to characterise the output voltage vs current curve. I’m using a 20ohm resistor to double the sensitivity. I ran a load curve and get linear results as with the 10ohm load but at double the sensitivity.
I wrapped 4 turns of my wire through the window of the CT for better accuracy, also found out the Tip and the Sleeve were connected to the CT, not sure what the ring is used for.
I was surprised at the level of detail I was able to get from this. I’m fascinated by the data I’m collecting. Plan to order quite a few more soon.