Split-Core Low-Voltage Current Transformers (Rectangular Window-Type)

Split-Core Low-Voltage Current Transformers (Rectangular Window-Type)

ES-1S-C Series

Split-core, rectangular, low-voltage, resin-insulated protective current transformers for switchgear-panel makers et al. Installs easily onto an existing power system.

About the Product

Intended for switchgear-panel manufacturers and other users, these rectangular, resin-insulated, low-voltage window-type current transformers are self-extinguishing and highly water-resistant. Each of these current transformers can be mounted on a busbar (the busbar can be either horizontally or vertically installed in the switchgear panel). Alternatively, the current transformer can be fixed directly to the switchgear panel; in this case, wiring can be done with a busbar or with insulated copper wires. The product comes with one type of mounting accessories, to be chosen by the customer from available options.

Features of the ES-1S-C Series

  • Single-core
  • Split-core window-type
  • For use with protective relays, or with measuring or monitoring instruments
  • Can be installed onto an existing system without cutting (or removing) the primary busbar or insulated wires


  • Standard: IEC or IEEE
  • For indoor use
  • Rated voltage: ≦ 0.72 kV
  • Frequency: 50 or 60 Hz
  • AC/BIL: 3/- kV
  • Ith = 40 In/1S
  • Included: a choice of mounting accessories
  • Other specifications and standards available upon request

Selection Table

Other standards and specifications available.

Current (A)
Secondary Current (A)Burden/Accuracy
Core 1Core 2
ES-1S-AES-1S-60A400~8005 - 30VA/1.0 or 15VA/0.52.1Single-Core
ES-1S-80A *600~12005 - 30VA/1.0 or 15VA/0.52.1Single-Core
ES-1S-100A *1000~20005 - 30VA/1.0 or 15VA/0.52.2Single-Core
ES-1S-120A *2500~40005 - 40 VA/1.0 or 30VA/0.53.7Single-Core
ES-1S-165A *4000~70005 - 40 VA/1.0 or 30VA/0.54.3Single-Core
ES-1S-BES-1S-100B *1000~20005515VA/5P20+30VA/0.510Two-Core
ES-1S-120B *2500~40005515VA/5P20+30VA/0.59.5Two-Core
ES-1S-CES-1S-165C800~10005 - 7.5VA/5P106Split-Core
1250~16005 - 10VA/5P106Split-Core

*  Models marked with an asterisk require caution when mounted on a busbar. Care must be taken, when the switchgear panels are being moved or when during an earthquake, to prevent the current transformer from sliding due to its weight.

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