CTMK125 – Window-type current transformer for Bar of 1200A to 4000A

Window-type current transformers designed for measuring current in bars with maximum dimensions of 125x35mm. The range covers a wide range of primary currents, from 1200A to 4000A AC. They are available in accuracy classes of 0.1, 0.2S, to 1.0.

  • Bar (mm): 125 x 35
  • Conductor type: Single-phase
  • Magnetic core type: Closed
  • Primary current: 1200 A to 4000A
  • Secondary current: 5A (1A on request)
  • Class 0.1, 0.2S, 0.2, 0.5S, 0.5, or 1.0 depending on the size
  • Power (VA): 5 to 30 VA

Technical Specifications

CT Ratio

  • From 1200A to 4000A

Nominal Power

  • Up to 30VA

Accuracy Class

  • Classes 0.1, 0.2s, 0.2 or 0.5

Terminal

  • Full terminal coverage, high cross-section brass terminal for added safety.

Box

  • Flame-retardant ABS/PC. Self-extinguishing.

Mounting

  • On bar

Operating ambient temperature

  • -25 C° – +85 C°

Primary conductor

  • 125 x 35 mm

Round conductor

  • Non applicable

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 1min

Maximum system 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

RatioSeriesReferenceAccuracy Class
1.00.50.5s0.20.2s0.1
1200/5CTMK125CTMK125-1200/515151010
1600/5CTMK125-1600/5302525157.55
2000/5CTMK125-2000/5303030303030
2500/5CTMK125-2500/5303030303030
3200/5CTMK125-3200/5303030303030
4000/5CTMK125-4000/5303030303030

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