Split-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
ES-1S-C Series
Our split-core, rectangular-window current transformers from the ES-1S-C Series are resin-encapsulated for water resistance and self-extinguishing properties. These single-core current transformers work with protective relays or measurement instruments to monitor current flow per IEC/IEEE low voltage standards (720 volts / 600 volts, or 0.72 kV / 0.6 kV). Window-type design splits open without removing wiring for simple mounting on existing systems. Thermal withstand is 40x nominal current for 1 second. A choice of accessories helps simplify mounting and installation.
Rectangular Split-Core Resin-Insulated LV CT Instrument Transformer, 600V or 720V
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
Specifications
- 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 for Low-Voltage Rectangular-Type Current Transformer ES-1S
The following table outlines frequently requested specifications for our ES-1S Series rectangular low-voltage current transformers; contact us if you require models with alternative standards or specifications tailored to your application.
| Series | Model | Primary Current (A) | Secondary Current (A) | Burden/Accuracy (IEC) | Approx. Weight (kg) | Additional Info | |
| Core 1 | Core 2 | ||||||
| ES-1S-A | ES-1S-60A | 400～800 | 5 | - | 30VA/1.0 or 15VA/0.5 | 2.1 | Single-Core |
| ES-1S-80A * | 600～1200 | 5 | - | 30VA/1.0 or 15VA/0.5 | 2.1 | Single-Core | |
| ES-1S-100A * | 1000～2000 | 5 | - | 30VA/1.0 or 15VA/0.5 | 2.2 | Single-Core | |
| ES-1S-120A * | 2500～4000 | 5 | - | 40 VA/1.0 or 30VA/0.5 | 3.7 | Single-Core | |
| ES-1S-165A * | 4000～7000 | 5 | - | 40 VA/1.0 or 30VA/0.5 | 4.3 | Single-Core | |
| ES-1S-B | ES-1S-100B * | 1000～2000 | 5 | 5 | 15VA/5P20+30VA/0.5 | 10 | Two-Core |
| ES-1S-120B * | 2500～4000 | 5 | 5 | 15VA/5P20+30VA/0.5 | 9.5 | Two-Core | |
| ES-1S-C | ES-1S-165C | 800～1000 | 5 | - | 7.5VA/5P10 | 6 | Split-Core (Single-Core) |
| 1250～1600 | 5 | - | 10VA/5P10 | 6 | Split-Core (Single-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.
- Download Documents
【Product Brochure】Rectangular Current Transformers ES-1S-A/B/C Series
Easy-to-print document, containing product description, specifications, and a comparison table.
【Product Dimensions】Rectangular Current Transformers ES-1S-C Series
Download PDF for basic drawing(s) and dimensions of this product. For more detailed information, please contact CIC.
CIC Company Profile
Learn about our company: history, strengths, products, global locations, and our Advanced Electricity Lab.
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CT & PT Selection Guide: How to Choose a Current Transformer or Potential Transformer
How to select, based on application and power system attributes, the primary and secondary currents, burden, accuracy, rated frequency, type (indoor vs. outdoor), insulation material, etc.
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