CTK812
Open-core current transformer for Cable and Bar from 400 to 3000A

Current transformer with an opening core, closed by a screw-nut system. It is suitable for measuring current in single-phase cables up to 80 mm in diameter or bars with dimensions up to 120x80mm. The range covers a wide range of primary currents, from 400A to 3000A AC. They are available in precision classes from 0.5 to 3.0.

  • Bar (mm): 120 x 80
  • Round cable (mm): 80
  • Conductor type: Single-phase
  • Magnetic core type: Closed
  • Primary current: 400 A to 3000A
  • Secondary current: 5A (1A on request)
  • Class 0.5, 1.0, or 3.0 depending on the size
  • Power (VA): 2.5 to 30 VA

Description

Technical Specifications

Transformation ratio

  • From 400/5A to 3000/5A

Nominal Power

  • Up to 30VA

Accuracy Class

  • Classes 0.3, Class 1.0 or Class 0.5 depending on the size

Terminal

  • Screw-covered terminals

Box

  • Polycarbonate. Self-extinguishing

Mounting

  • On cable or bar

Operating ambient temperature

  • -25 C ~ +85 C

Primary conductor

  • 80 x 120 mm

Round conductor

  • Diameter 80 mm

Number of inputs

  • 1 input

Short-time thermal current

  • Ith = 60 kA

Continuous thermal current

  • Id=1 * In

Nominal frequency

  • 50Hz … 60Hz

Overvoltage current limiting factor

  • FS 5

Test voltage

  • 3kV for 1min

System Max volatage

  • 0.72kV

Applicable Standards

  • IEC 60044-1

  • IEC 61869-2

  • VDE 0414-1

  • DIN57414

  • BS3938

  • BS7626

  • EN 61869-2

Diagrams and Dimensions

Reference Tables

Opening
(mm)		 Series Ratio (A) Accuracy Class Power (VA)
80 x 120 CTK812-400/5 400/5A 3 2.5
CTK812-500/5 500/5A 1 2.5
CTK812-600/5 600/5A 1 5
CTK812-800/5 800/5A 1 10
CTK812-1000/5 1000/5A 1 10
CTK812-1250/5 1250/5A 0.5 10
CTK812-1600/5 1600/5A 0.5 10
CTK812-2000/5 2000/5A 0.5 15
CTK812-2500/5 2500/5A 0.5 15
CTK812-3000/5 3000/5A 0.5 30

Technical Specifications

Transformation ratio

  • From 400/5A to 3000/5A

Nominal Power

  • Up to 30VA

Accuracy Class

  • Classes 0.3, Class 1.0 or Class 0.5 depending on the size

Terminal

  • Screw-covered terminals

Box

  • Polycarbonate. Self-extinguishing

Mounting

  • On cable or bar

Operating ambient temperature

  • -25 C ~ +85 C

Primary conductor

  • 80 x 120 mm

Round conductor

  • Diameter 80 mm

Number of inputs

  • 1 input

Short-time thermal current

  • Ith = 60 kA

Continuous thermal current

  • Id=1 * In

Nominal frequency

  • 50Hz … 60Hz

Overvoltage current limiting factor

  • FS 5

Test voltage

  • 3kV for 1min

System Max Voltage

  • 0.72kV

Applicable Standards

  • IEC 60044-1

  • IEC 61869-2

  • VDE 0414-1

  • DIN57414

  • BS3938

  • BS7626

  • EN 61869-2

Diagrams and Dimensions

Reference Tables

Opening
(mm)		 Series Ratio (A) Accuracy Class Power (VA)
80 x 120 CTK812-400/5 400/5A 3 2.5
CTK812-500/5 500/5A 1 2.5
CTK812-600/5 600/5A 1 5
CTK812-800/5 800/5A 1 10
CTK812-1000/5 1000/5A 1 10
CTK812-1250/5 1250/5A 0.5 10
CTK812-1600/5 1600/5A 0.5 10
CTK812-2000/5 2000/5A 0.5 15
CTK812-2500/5 2500/5A 0.5 15
CTK812-3000/5 3000/5A 0.5 30

Product Documentations

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