IoTaWatt 100amp Split Core Current Transformer

In stock

Split-core design snaps around conductor.  Compatible with the IoTaWatt Smart Power Monitoring System.

  • Working current: 100A
  • Maximum current: 100A
  • Accuracy 0.5%
  • opening: 16mm (~.62 in)
  • Cord length: 1.5m (~5 ft)
  • Connector: 3.5 mm stereo plug
  • TVS diode protection
  • Size: 30mm x 31mm x 53mm
  • Model: ECS16100-L59H 100A/50mA

See our bundle listing for IoTaWatt - CT clamps are heavily discounted when purchased with the IoTaWatt base unit.

When you add an IoTaWatt Open WiFi Electric Monitor - Base Unit to your cart, every current transformer you purchase will be discounted by $10! The discount will be visible at the checkout page or you can click "View Cart".
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Configuring Power Channels (CTs)

What is a power channel?

Power channels measure the current flow through a circuit and combine that with the reference voltage to determine power, expressed in watts, and to accumulate energy used, expressed in watt-hours. Current through a circuit is measured indirectly by installing a passive sensor, called a current transformer (CT), around one of the conductors in the circuit. CTs come in a various capacities, physical connection type, and electrical output.

The good news is that IoTaWatt supports a wide variety of readily available CTs, and many can be configured simply by selecting the model from a list. CTs are connected with 3.5mm stereo jacks (headphone jacks). The CTs that are sold at the Smart Guys Australia are manufactured with 3.5mm jacks.

Echun ECS16-100

Echun ECS16-100 CT

Connecting the CTs

This tutorial does not cover physical installation of the CTs to your electrical circuits. That should be done by someone familiar with electrical wiring. Your qualified installer will know how to do this. The 3.5mm connectors plug into any of the 14 input channels on the IotaWatt.

The only additional recommendation is that all of the CTs be oriented the same way with respect to current flow. Most CTs have an arrow or other marking to aid in consistent orientation. Not to worry, in the event some end up backward, IoTaWatt will still work, will tell you which ones appear to be backward, and provides a way to correct virtually.

You can find more detailed information about physical installation of CTs in the CT Basics section.

Configuring the Input Channels

At this point, you should have the IoTaWatt up and running with the voltage channel connected, configured, and calibrated if necessary. You are using the config app in a browser connected to your WiFi network. Hover over **Setup button** and click **Inputs button** in the dropdown buttons.

Setup Inputs List

This screen should look familiar. We came here to configure the voltage transformer (VT). Now we will configure current transformers (CTs) to other inputs. To add or edit the CT specification for an input channel, click the channel’s number button. Let’s add a CT to channel **Input 1 button**.

Config Generic CT

The app enters channel edit mode. Here you specify the model and other details about the CT connected to this particular channel. But first, it is helpful to name the channel by typing a name in the name box. You can just use the default “Input_1” or something more meaningful like “Kitchen” or “Living Room” or “Main”. We will configure one of our US 120/240V split-phase mains as main_1.

The default type is CT and that’s correct.

The next drop-down box is the model of the CT. Initially it will be generic, Click the drop-down list and select the ECS24200 CT.

Select ECS24200 CTConfig ECS24200 CT

Notice that after selecting a specific device from the table, the input fields for “turns” and “phase” disappear. That’s because those values are known for the listed CTs. If you have a CT that is not found in the list, you will need specify the “generic” entry and provide the turns-ratio and phase-lead for that CT. see generic CT below.

There are check-boxes to further configure the CT. Most of the time, these will not be used, but there are circumstances where you would check one or more of them. If you hover on the ! next to each, a brief description will appear. They are explained below:

Applicable Dangerous Goods Regulations Not Applicable

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