ABB KORC 4S 185R4 1SCA022181R0330 1SCA022142R1860 current transformer

The ABB KORC 4S 185R/4 is a precision low-voltage ring-type (window-type) current transformer designed for accurate current measurement and protection in industrial and commercial electrical installations. Part of ABB's widely deployed KORC series, this CT is engineered for circuits with normal full-load current around 185 Amperes .

This model is available under two ABB ordering codes:

1SCA022181R0330 (Primary ordering number)

1SCA022142R1860 (Alternative/legacy number)

Both codes reference the same core specification and are fully interchangeable. The alternative part number 1TNA900341R0185 is also commonly used for ordering and identification .

Key Features & Benefits

Feature Benefit

Ring-type (window-type) construction Easy installation on existing cables without cutting or disconnecting primary conductors; ideal for retrofit applications

185A primary / 4A secondary ratio Standardized 4A secondary output suitable for compatible metering and protection devices

Compact 4S form factor 40mm window diameter accommodates standard cable sizes; fits in tight panel spaces 

Low voltage rating Rated insulation voltage 0.72 kV, suitable for 600V class low-voltage systems 

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

Multiple ordering code options Flexible procurement through various ABB distribution channels

Technical Specifications

Parameter Value

Brand ABB

Series KORC 4S

Type Ring-type / Window-type Current Transformer

Rated Primary Current (Ipn) 185 A

Rated Secondary Current (Isn) 4 A

Turns Ratio 185:4 

Physical Specifications

Parameter Value

Window Diameter 40 mm (4S size designation) 

Rated Insulation Voltage 0.72 kV (720V)

Frequency 50/60 Hz 

Performance Characteristics

Parameter Value

Typical Accuracy Class Class 1 or Class 0.5 (verify on nameplate)

Application Type Metering / Measurement with protection capability

Construction Molded case, resin-encapsulated

Note: Exact accuracy class and burden rating should be verified from the product nameplate or official ABB datasheet, as KORC series CTs are available in both metering and protection variants .

Model Number Decoding

Code Meaning

KORC ABB current transformer series designation

4S Physical size variant; 4S indicates 40mm window diameter 

185 Rated primary current: 185 Amperes

R Ring-type / window-type construction

/4 Rated secondary current: 4 Amperes

1SCA022181R0330 ABB ordering code (primary number)

1SCA022142R1860 ABB ordering code (alternative/legacy number)

1TNA900341R0185 ABB internal article number (alternate ordering code)