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Product Center > Current Transformers > SCT Clamp Split Core CT > Clamp on current transformer
Clamp on current transformer
Clamp on current transformer


In electrical and electronic engineering, a split type current transformer is an electrical device with jaws which open to allow clamping around an electrical conductor. This allows measurement of the current in a conductor without the need to make physical contact with it, or to disconnect it for insertion through the probe. split type current transformers are typically used to read the magnitude of alternating current (AC) and, with additional instrumentation, the phase and waveform can also be measured. Some clamps meters can measure currents of 1000 A and more.


The round jaw design on the JW Series AC split type current transformer along with the high content nickel metal core makes them well suited for power quality applications where high accuracy and low phase shift along with wide frequency are important. Measurement range is 1mA to 1200A.

The JW 
split type current transformer is a general purpose 1000A AC current clamp designed for use with DMMs, loggers and other instruments that have a current input. It has a 1000:1 ratio and output of 1mA per amp or 1mV per amp measured in the jaw. The JW has an integral 2.5m lead terminated. The rounded jaw design on this current clamp makes it well-suited for power applications where high accuracy 0.1% and low phase shift and wide frequency response are important. Power quality measuring

Large industrial loads

Measuring around cable bundles

Power load monitoring

Waveform analysis

Energy meter calibrator

Power monitor

Phase Angle meter

Resistance tester


Measurement range of 1mA to 1200A AC

Large jaw opening accommodates conductors up to two 500kcmil

Improved ergonomic design and easy operation

High content nickel metal core

Conforms to EN 61010, 600V CAT III

Low phase shift for power measurement

Designed for DMMs, recorders, loggers, oscilloscopes, power and harmonic meters

UL, CE mark



Electrical parameters
Ratio 1000: 1 or 2000:1 (customized)
Accuracy class 0.1%, 0.2%, 0.5%
Primary current 0 - 1000A AC
Secondary output 1mV/A AC, 5mV/A, 1mA/A, 0.5mA/A  or (customized)
Max. Cont. Input current 1200A
Over voltage category CAT III 600V
Output signal 333mV, 500mV,1V,2V,5V, 1A, 5A AC at nominal input current
Accuracy (1000A Range)  
0-10A ≤0.5%
10-100 ≤0.2%
10-1200A ≤0.1%
Phase Shift(1000A Range)  
0-10A ≤0.5°
10-100 ≤0.2°
100-1200A ≤0.1°
Electrical parameters - continued  
Frequency range 40Hz-20MHz
Dielectric strength 3KV 50Hz/60Hz  at 1 minute
Temperature range -20°C to +55°C
Output 2.5 meter cable with D01 connector
Max. voltage not insulated conductors 600 V
Standard EN 61010-1, EN 61010-2-032, IEC60044-1
Installation clamp type
Output mode lead output(2.5m)
Mechanical parameters
Dimensions (L x W x H) (mm) 102.9 x 219.6 x 28
Weight (g) 550
Holding wire diameter (mm) φ50
Max. jaw opening (mm) 50
Color Gray or Blue
Material PC+ABS+Polycarbonate, UL94 V0


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