html{display:none} SCT Submersible Separable-Core Current Transformers | Schweitzer Engineering Laboratories


Submersible Separable-Core Current Transformers

SCT—Submersible Separable-Core Current Transformers (CTs) are designed for applications where it is difficult or uneconomical to open the primary conductor to install a solid-core-type CT. The separable-core design allows the SCT to be opened to the nominal window diameter and installed over bushings or over cables without interrupting the connection. SCTs are held in place with cable ties. A submersible design option provides reliable use in subsurface vaults where flooding can occur.

The SEL SCT is encapsulated in flexible vinyl plastic with 600 V-class insulation. The SCT consists of a separable two-part assembly. The SCT base and SCT body can be pulled apart, placed around a cable, and reconnected. Two included stainless steel worm gear clamps secure the base and body of the CT while also preventing water intrusion into the CT core.

Volume pricing available.


Starting At

$208 USD

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Subsurface Vault Feeder Monitoring—Use the SCT in conjunction with an SEL relay, like the SEL-787 Transformer Protection Relay, and an SEL-3060 Ethernet Radio to wirelessly send feeder data to a supervisory control and data acquisition (SCADA) system or distribution management system (DMS) or for engineering support. Build an economical system to monitor loads, detect overload conditions, and capture pre- and postevent data.

Load Current and Overcurrent Sensing—Apply SCTs to serve as an input for source transfer relays. Use SCTs to distinguish fault current from load current to prevent switching into a fault.

Wet Environment Submetering—Use SCTs to submeter equipment within wet environments, including water treatment plants, pulp and paper mills, and other environments subject to water and extreme humidity.

  • Separable-core design eliminates the need to open the primary cable during installation over existing bushings or cable, resulting in lower installation costs and time than closed-core designs.
  • Design allows for installation when secondary load is present.
  • SCT has a rectangular 3.5" window diameter.
  • Rugged submersible encapsulation provides 600 V-class insulation and ensures a long product life for applications where flooding and extreme humidity may occur.
  • Secondary connections from the cable to the CT windings are sealed in potting compound and further protected with a vinyl coating.
Burden Range6.25 and 4,000 VA
CT Ratio Range600:5 and 4800:1
Accuracy Range3% to 5%
Accuracy at % Current Range3% to 5%
600 V ClassYes
Window Diameter3.5" (rectangular)
Locking MechanismWorm gear clamps
Leads IncludedYes (option)
Shorting/Protection IncludedYes (option)
Submersible OptionYes


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