Single-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
ES-1S-A Series
Rectangular current transformers from the ES-1S-A series are single-core (solid-core), low-voltage (600 or 720 volts / 0.6 or 0.72 kV), resin-encapsulated current transformers. Their window-type design for easy mounting on busbars. Designed to work with measurement instruments to enable monitoring per IEC/IEEE standards, these current transformers deliver thermal withstand up to 40x nominal current for 1 second. Choose mounting accessories to simplify installation in your specific application.
Rectangular Solid-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-A Series
- Single-core
- Window-type
- Designed to be used with measuring or monitoring instruments
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-A 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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