ABB KORC 4L 185R/4 1SCA022193R7830 1SCA022142R2670 current transformer

The ABB KORC 4L 185R/4 is a high-precision window-type current transformer (CT) designed for 12kV medium-voltage power systems. 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 two ABB ordering codes:

1SCA022193R7830

1SCA022142R2670

Both codes refer to the same core specification and are fully interchangeable. The alternative part number CT4L185R/4 is also commonly used for ordering and identification .

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

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

IEC 61869 compliance Meets international standards for instrument transformers, ensuring global acceptance and reliability

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

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

EAN / GTIN 4013614482113

Model Number Decoding

Code Meaning

KORC ABB current transformer series designation

4L Series design framework; this model features 2 independent cores (measurement + protection)

185 Rated primary current: 185 Amperes

R Standard configuration (ring-type / window-type)

/4 Rated secondary current: 4 Amperes

1SCA022193R7830 ABB ordering code (primary ordering number)

1SCA022142R2670 ABB ordering code (alternative / legacy number)