eGauge Sensor Hub ESH044

The eGauge Sensor Hub (ESH044) allows up to four CTs or other approved (powered or unpowered) sensors to be connected to a single eGauge. The Sensor Hub is designed to be installed in a breaker panel or enclosure, and simply requires an Ethernet run back to the eGauge meter. With the Sensor Hub, it's no longer necessary to extend CT leads by hand, reducing issues with improperly spliced or extended wiring.

The eGauge Sensor Hub is compatible with all eGauge meter models (eGauge2, EG30xx, EG4xxx). However, firmware updates may be require to add support for certain types of CTs or other approved sensors.

Hardware included:

1x eGauge Sensor Hub

1x eGauge to hub connector (whip)

1x RJ-45 coupler

The Sensor Hub kit (SKU ESH044) comes with three primary components.

1. Sensor Hub. This is the main unit.

The RJ-45 jack (1) is used to connect the hub to the eGauge. 5V power can be supplied via the two pin plug on the side of the hub (2) or a mini USB port (3). If 5V power is supplied, the "+5V" LED will illuminate. The four switches A through D on the face of the unit (4) determine whether the eGauge reads from a two pin CT input (5) or a four pin powered sensor input (6). 

Note that any combination of supported sensors (powered or unpowered) and CTs can be used, but only one sensor can be used per port. For example, if a CT is connected to the two pin port on "A", the four pin port on "A" cannot be used.

2. eGauge to hub connector (whip). This connects the hub to the eGauge.

The eGauge to hub connector splits the RJ-45 cable into four sensor channels. To install, connect the two pin CT plugs (1) to CT ports on the eGauge. Connect the RJ-45 plug (2) to the Sensor Hub (either directly or using the coupler). 

Note that the wire colors on the two pin plugs correspond to the colors on the front of the Sensor Hub. For example, the two pin plug with orange wires would be input "A" on the hub.

Do not connect the RJ-45 plug to an Ethernet port on the eGauge or any other hardware. Damage may result.

3. RJ-45 Coupler. This can be used to extend the distance between the eGauge and the Sensor Hub.

The coupler simply provides a convenient means to extend the wiring between the eGauge and Sensor Hub. It does not require power. The RJ-45 plug on eGauge to hub connector (whip) is connected to one side, and a standard CAT5 cable is connected between the coupler and the Sensor Hub on the other side.

An extension of up to 100'/33m may be used. Longer runs may work, but could also lead to a loss of accuracy. Care should be taken to ensure the extension is wired to the T568B CAT5 standard to avoid mixing up sensor inputs. If in doubt, compare the wiring of the extension to the color key located above the Sensor Hub RJ-45 port.


The Sensor Hub is not a network device. It should not be connected to network hardware via Ethernet or CAT5 - doing so may damage the Sensor Hub or the hardware. The RJ-45 port on the Sensor Hub is only to be used with the included eGauge to hub connector.

The Sensor Hub is only intended to be used with a 5V DC power supply. Connecting any other power supply may damage the Sensor Hub and any connected hardware (eGauge, powered sensors).

The Sensor Hub should be mounted inside a suitable enclosure or inside the panel where the CTs are installed. It should never be installed in the open.

Assembly/installation information:

The image below shows a Sensor Hub connected to an eGauge meter and two CTs. This is not intended to represent an actual installation - it merely highlights the relationship between the components. Always adhere to code regulations during installation.

Note that the orange lead is connected to CT port 1 and the green lead is connected to CT port 2. This means the CT on port A of the Sensor Hub is "CT1" and the CT on port B of the sensor hub is "CT2" when working with the eGauge configuration.

The switches for "A" and "B" have been set to use unpowered sensors (CTs). The position of the switches for "C" and "D" are irrelevant here, since no sensors are connected to those ports.

Although "C" and "D" are not in use, they have been connected to CT port 3 and CT port 4 respectively. This may be useful if additional CTs are connected in the future.

The Sensor Hub is not connected to a power supply here, as no powered sensors are in use.

Multiple Sensor Hubs can be connected to a single eGauge meter. Care should be taken to identify the hubs correctly, in order to avoid mixing up CTs.

Software configuration Information

The Sensor Hub does not require any special configuration when used with CTs. Simply specify the CT type (manufacturer, physical diameter, amperage) and create registers as normal.

Using the example above, we have two J&D 10mm 50A CTs on CT ports one and two. Assuming they are each monitoring a single 120V branch circuit (eg, CT1 is monitoring lights and CT2 is monitoring receptacles), the eGauge configuration might look like this:

Other approved sensors are configured in a similar manner (ie, set the sensor type, then create a register to store data from that sensor). For more details, refer to the knowledgebase articles for that specific sensor.

Technical information and documentation

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