Low-Voltage (LV) Resin-Encapsulated Current Transformer - Window Type - Indoor Use
EOS-RN / EOS-RM Series
Resin-encapsulated current transformers in the EOS-RN and EOS-RM series, for indoor applications under 600 Volts or 0.72 kV, have 33-120mm windows suiting busbar/wiring primaries from 100-3200A. Robust build quality and fixed metal base ensure reliable performance. Economic models are available.
Resin-Insulated CT Instrument Transformer, 600V (0.6 kV) or 720V (0.72 kV)
About the Product
Low-voltage window-type current transformers EOS-RN Series are resin-insulated instrument transformers designed to be used in indoor settings. In an EOS-RN current transformer, the window is sized at 33, 38, 60, 90, or 120 mm ⌀. On the primary side, wiring can be done with a busbar or with insulated wire. The specifications of the EOS-RN Series allow a Primary Current of 100A~3200A and offer a Burden and Accuracy of 15～30VA/1.0CL. When used for billing purposes, and if the Primary Current is above 200A, the EOS-RN Series Current Transformers offer a Burden and Accuracy of 5～30VA/0.5CL. (however, if the Primary Current is under 100A, it is necessary to adjust the number of primary turns). Each of the EOS-RN Series Current Transformers comes with a sealable terminal cover for its secondary side. Fixed with a metal base and featuring a fine exterior, these compact-sized current transformers are characterized by their excellent physical and electrical properties.
Sharing similar specifications with the EOS-RN Series (please refer to Selection Table), the EOS-RM Series Current Transformers are compact in size and economically priced.
Common Specifications
Standard: IEC or IEEE
Usage: Indoor
Rated Voltage: up to 0.72 kV
Frequency: 50 or 60 Hz
AC/BIL: 3/- kV
Ith = 40 In/1S
Selection Table for Current Transformer EOS Series, Low-Voltage Window Type
The following table outlines frequently requested specifications for our EOS Series low-voltage window-type current transformers; contact us if you require models with alternative standards or specifications tailored to your application.
| Model | Primary Current (A) | Secondary Current (A) | Burden and Accuracy (Standard: IEC) | Approx. Weight (kg) |
| EOS-33RN | 100 ~ 150 | 5 or 1 | 15VA/1.0CL | 1.9 |
| 200 ~ 300 | 30(15)VA/1.0(0.5)CL | |||
| EOS-38RN | 200 ~ 300 | 15VA/1.0CL | 1.2 | |
| 350 ~ 500 | 30(15)VA/1.0(0.5)CL | |||
| EOS-60RN | 500 ~ 700 | 30(15)VA/1.0(0.5)CL | 1.4 | |
| EOS-90RN | 800 ~ 1200 | 1.7 | ||
| EOS-120RN | 1500 ~ 3200 | 2.2 | ||
| EOS-33RM | 100 ~ 150 | 5VA/1.0CL | 0.9 | |
| 200 ~ 300 | 15VA/1.0CL | 0.9 | ||
| EOS-60RM | 400 ~ 800 | 1.1 |
- Download Documents
【Product Brochure】Resin-Insulated LV Current Transformers (Window-Type, Indoor Model) - EOS-RN / EOS-RM Series
Easy-to-print document, containing product description, specifications, and a selection table.
【Product Dimensions】Resin-Insulated LV Current Transformers, EOS-RN / EOS-RM 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.
-
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.
- Related Products
Low-Voltage Current Transformer / Extended Range Current Transformer (ERCT) for Revenue Metering, Window-Type
ROS-A Series
Extended-Range Current Transformers (ERCT) for Revenue Metering offer precision in billing, with an operating range for accuracy up to 1% ~ 200% of rated current. Our window-type resin-cast current transformers “ROS-A Series” for low-voltage or LV (720 volts / 600 volts, or 0.72 kV / 0.6 kV) applications come in both ERCT and standard varieties. Range of specifications include Metering Class 0.15, Thermal Rating Factor up to 4.0, Current Ratios from 100:5A to 4000:5A, and multiple window diameter options. Special IP65 outdoor edition is available.
ABS-Encased Current Transformer - Low Voltage - Window Type - Indoor Use
POS Series
Window-type current transformers in the POS Series, for 600-Volt or 0.72 kV power systems, feature a compact, lightweight ABS housing that enables flexible installation, even in tight spaces like motor control centers. Their high-quality coil and annealed core deliver rated accuracy per international standards. Primary connections suit busbar or insulated wiring. With up to 40 VA burden and 0.5, 1.0 or 3.0 accuracy class, these versatile CTs meet demanding application needs. The self-extinguishing ABS enclosure ensures safety. Top-facing terminals speed wiring while covers protect connections.
Two-Core Rectangular-Window Current Transformer - Resin Encapsulated - Low Voltage - Indoor
ES-1S-B Series
Rectangular current transformers of the ES-1S-B series are dual-core (double-core) window-type models for versatile installation. The two-core design makes this a dual-purpose CT, allowing simultaneous use with measurement devices and protective relays per IEC/IEEE low voltage standards (720 volts / 600 volts, or 0.72 kV / 0.6 kV). Resin insulation delivers water resistance and self-extinguishing properties. These current transformers withstand 40x thermal current for 1 second. A choice of mounting accessories is included.
Low-Voltage Current Transformer for Higher Current Ratio and Higher Accuracy - Window Diameter up to 160mm
CR-1S Series
Low-voltage current transformers of the CR-1S Series, available in multi-ratio or single-ratio models, offer higher current ratios (800-4000/5A), higher accuracy, and larger window diameters (even to 160mm or 6.3”) for convenient installation over high current busbars. These epoxy-resin-cast low-voltage (720 volts / 600 volts, or 0.72 kV / 0.6 kV) current transformers facilitate wiring while decreasing contact failure rates.
