CTK88 – Open-core current transformer for cable and bar from 400 to 2000A.

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 maximum dimensions of 80x80mm. The range covers a wide range of primary currents, from 400A to 2000A AC. They are available in accuracy classes ranging from 0.5 to 1.0.

Bar (mm): 80 x 80 ;
Round cable (mm): 80
Conductor type: Single-phase
Magnetic core type: Closed
Primary current: 400A to 2000A
Secondary current: 5A (1A on request)
Class 0.5 or 1.0 epending on the size
Power (VA): 2.5 to 10 VA

Technical Specifications

Transformation ratio

From 250/5A to 2000/5A

Nominal Power

Up to 30VA

Accuracy Class

Class 1.0 or Classe 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 80 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 80	CTK88-400/5	400/5A	1	2.5
	CTK88-500/5	500/5A	1	2.5
	CTK88-600/5	600/5A	1	2.5
	CTK88-800/5	800/5A	1	10
	CTK88-1000/5	1000/5A	1	10
	CTK88-1200/5	1200/5A	1	10
	CTK88-1250/5	1250/5A	1	10
	CTK88-1600/5	1600/5A	0.5	10
	CTK88-2000/5	2000/5A	0.5	10