CTs, Rogowski coils and flexible CT wire harnesses

AC current sensors from 15A to 10,000A

Packet Power offers a wide range of AC current sensors to meet your power monitoring needs.

  • Split core CTs - 15A to 4000A
  • Solid core CTs - 30A to 400A
  • Rogowski coils - 100A to 10,000A
  • Pre-wired CT harnesses that fit in even the tightest spaces
  • Loose CT leads in a variety of lengths for any installation
Packet Power CTs Rogowski coils and CT wire harness
Packet Power AC power split core CTs

Split core CTs

Split core CTs can be opened and placed around the conductor without having to disconnect the conductor or disrupt power. Split core CTs are more expensive than solid core CTs but the added convenience makes them the preferred choice for retrofit installations. 

Inside Diameter Rated Amperage (A)
10 mm 15,  30,  50
16 mm 100
24 mm 100,  200,  300
36 mm 200,  300,  400,  600
50 x 50 mm 400,  600,  800
75 x 125 mm 300,  600,  800
150 x 150 mm 800,  1000,  1200,  1600,  2000,  3000,  4000

Contact Packet Power for additional current ratings.

Solid core CTs

Solid core CTs feature a permanently closed core. Installing a solid core CT requires disconnecting the conductor to pass it through the CT core. Solid core CTs are a cost effective solution when service disruption is not an issue.

Inside diameter Rated Amperage (A)
9 mm 35
15 mm 60
32 mm 200,  400

Contact Packet Power for additional options.

Packet Power solid core AC CT
Packet Power flexible Rogowski coil current sensors

Rogowski coil sensors

The most versatile of current sensor options, Rogowski coils are flexible enough to fit around irregularly-shaped conductors and minimize disruption to service during installation. Packet Power offers a variety of coil lengths.

Inside diameter Coil length Typical Amperage
68 mm 250 mm 100A to 1000A
147 mm 500 mm 400A to 3000A
211 mm 700 mm 1000A to 5000A
306 mm 1000 mm 2000A to 10,000A

Contact Packet Power for additional options.

CT wire harnesses

Flexible, preconfigured wire harnesses can cut installation time in half and fit into tight spaces inside panels.

The wire harnesses accommodate side-by-side, inline or DIN mount panels with 19-25 mm (3/4" to 1") center-to-center breakers. They are ideal for use when all circuits in a panel will be monitored.

Wire harnesses arrive already connected to the CT Interconnect Board. The wire harness leads are labeled and end in a quick disconnect that makes it easy to add CTs immediately or over time.

Wire lengths and lead labels vary by harness type. CTs are sold separately.

Packet Power CT wire harness

CT harness types


Packet Power top down CT wire harness

Top down 

  • 21-CT and 24-CT harnesses
  • For side-by-side panels
  • CT Interconnect Board placed at the top of the power panel
Packet Power bottom up CT wire harness

Bottom up

  • 21-CT and 24-CT harnesses
  • For side-by-side panels
  • CT Interconnect Board placed at the bottom of the power panel
Packet Power Sequential CT wire harness


  • 16-CT, 21-CT and 24-CT harnesses
  • For inline panels, first CT Interconnect Board is placed at the top of the inline panel with remaining Boards evenly spaced beside the panel
  • For DIN-mount panels, CT Interconnect Board are placed at the side of the panel
Packet Power DIN mount wire harness


  • 16-CT harness
  • For DIN-mount panels
  • CT Interconnect Board placed at the DIN rail mid-point in the panel
  • All CT leads are the same length and are labeled sequentially


Common harness placements

Panel types vary widely by the number of breaker positions and how they are arranged. Packet Power flexible CT wire harnesses can accommodate any breaker configuration. Simply identify the number of CTs, the type of panel and where you will place the CT Interconnect Boards in relation to the circuits being measured.

Here are the most common harness placements by panel type and the corresponding CT harness type. 

In cases where a wire harness doesn't work such as when circuits being measured are not evenly spaced, loose CT leads can be used.

Contact info@packetpower.com for additional wire harness options.

Packet Power CT wire harness placement options

A range of CT options to meet any need      Contact Us

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