ABB KORC 4S 310R4 1SCA022181R0500 1SCA022142R2240 current transformer

The ABB KORC 4L 185R/4 is a high-precision window-type (through-hole) current transformer designed for 12kV medium-voltage power systems. As part of ABB's renowned KORC series, this CT provides accurate current measurement and reliable protection for industrial switchgear applications, including ABB UniGear and other metal-enclosed switchgear panels.

This model is available under multiple ABB ordering codes, all referring to the same core specification:

1SCA022193R7830

1SCA022142R2670

CT4L185R/4 (Alternative Part Number) 

All codes are fully interchangeable for ordering purposes.

EAN/GTIN: 4013614482113 

Key Features & Benefits

Feature Benefit

Dual-core, dual-winding design Separate cores for measurement (Class 0.5) and protection (Class 5P10) ensure optimal performance for both functions without interference 

Window-type (through-hole) construction Easy installation on cables or busbars without cutting primary conductors; ideal for retrofit and new panel builds

185A primary / 4A secondary ratio Standardized 4A secondary output compatible with most protection relays and metering devices

ABB UMC100 compatibility Specifically designed to work with ABB UMC100 and UMC100-FBP universal motor controllers 

Compact footprint Fits seamlessly into ABB and third-party switchgear compartments

IEC compliance Meets IEC/EN 60947-1 and IEC/EN 60947-4-1 standards, ensuring global acceptance and reliability 

ABB original quality Backed by ABB's global manufacturing and technical support network

Country of Origin Manufactured in India 

Technical Specifications

Parameter Value

Brand ABB

Series KORC 4L

Type Window-type / Through-type Current Transformer

Rated Primary Current (Ipr) 185 A

Rated Secondary Current (Isr) 4 A

Turns Ratio 185:4

Core 1 – Measurement Winding

Parameter Value

Accuracy Class 0.5

Rated Burden 15 VA

Core 2 – Protection Winding

Parameter Value

Accuracy Class 5P10

Rated Burden 15 VA

Accuracy Limit Factor (ALF) 10

Accuracy Limit Current 1850 A (10 × Ipr)

General Specifications

Parameter Value

Frequency 50/60 Hz

Rated Insulation Level 12 kV (suitable for 12kV systems)

Power Frequency Withstand Voltage 28 kV / 1 min

Impulse Withstand Voltage 60 kV

Window Diameter Approx. 70–80 mm (for cable/busbar passage)

Standards IEC 61869-1, IEC 61869-2, IEC/EN 60947-1, IEC/EN 60947-4-1 

Dimensions & Connection

Parameter Value

Product Net Width 192 mm 

Product Net Height 98 mm 

Product Net Depth / Length 43 mm 

Product Net Weight 1.55 kg 

Connecting Capacity 1x 1.5-6 mm² 

Terminal Type Screw Terminals 

Wire Stripping Length 7 mm 

Model Number Decoding

Code Meaning

KORC ABB current transformer series designation

4L Series design framework; indicates dual-core configuration (measurement + protection)

185 Rated primary current: 185 Amperes

R Ring-type / window-type construction

/4 Rated secondary current: 4 Amperes

1SCA022193R7830 ABB ordering code (primary ordering number)

1SCA022142R2670 ABB ordering code (alternative number)

CT4L185R/4 Short-form ordering designation