CTSB0203 Split Core Current Transformer

Split-core current transformer

The CTSB0203 series of split-core current transformers are designed for the measurement of AC currents carried by large primary conductors or substation BUS bars.The split-core design permits the fast and easy installation on large primary conductors/ substation BUS bars without requiring that the primary conductor be taken offline and disconnected for CT (current transformer) installation.
The CTSB series of split-core current transformers feature a high performance magnetic core for highly accurate AC current measurement. The robust packaging features;

These features insures consistent and highly accurate AC current measurement performance over the life of the current transformer installation.
The robust CTSB split-core current transformer design, manufactured in an ISO9001 certified manufacturing facility, insures many years of defect free operation backed by a strong product warranty of 36 months.

Current RatioAccuracy Class
(max burden)
100A:5A3.0 (1.5ohm)10% to 130%
150A:5A3.0 (2.0ohm)10% to 130%
200A:5A1.0 (1.5ohm)10% to 130%
250A:5A1.0 (2.0ohm)10% to 130%
300A:5A0.5 (1.5ohm)10% to 130%
400A:5A0.5 (2.5ohm)10% to 130%


  • Input Frequency: 50/ 60 HZ
  • Accuracy Class: 0.5, 1.0, 3.0
  • Phase Angle: less than 2 degrees at 50% of rated current
  • Linearity: ±1% from 10% to 130% of rated primary current
  • Insulation Voltage 720 Vac
  • Maximum Primary Voltage 5,000Vac (insulated conductor)
  • Operating temperature: -15ºC to +60ºC
  • Construction:
    • Epoxy encapsulated
    • Case: Nylon UL flame retardant rating 94V-0
  • RoHS Compliant

Physical Specifications:
Dimension mm (in)
20.0 (0.8)30.0 (1.2)51.0 (2.0)89.0 (3.5)111.0 (4.4)
Dimension mm (in)
34.0 (1.3)47.0 (1.9)40.0 (1.6)32.0 (1.3)

Download CTSB Brochure (pdf 349kb)
CTSB InstallationInstallation instructions (664kb)

Many of our products can be designed and manufactured to meet the specific application requirements. For a no obligation technical evaluation, contact us with your specific performance requirements.