Clamp On Current Transformer

A 0.1 % clamp with a high nickel content core and a 40 Hz to 20 MHz frequency range. Built for power quality work where phase shift matters as much as magnitude, on conductors up to 50 mm.

Measurement range1 mA to 1200 A AC
Ratio1000:1 or 2000:1 (customised)
Accuracy class0.1 %, 0.2 %, 0.5 %
Output signal333 mV, 500 mV, 1 V, 2 V, 5 V, 1 A, 5 A
Frequency range40 Hz to 20 MHz
Overvoltage categoryCAT III 600 V
Max jaw opening50 mm
StandardEN 61010-1, EN 61010-2-032, IEC 60044-1

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Product Overview

In electrical and electronic engineering, a split type current transformer is a 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.

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

The JW is a general purpose 1000 A AC current clamp designed for use with DMMs, loggers and other instruments that have a current input. It has a 1000:1 ratio and an output of 1 mA per amp or 1 mV per amp measured in the jaw, with an integral 2.5 m lead.

Application Scenarios

Power quality measuring
Large industrial loads
Measuring around cable bundles
Power load monitoring and waveform analysis
Energy meter calibrators, power monitors, phase angle meters and resistance testers

Technical Features

Measurement range of 1 mA to 1200 A AC
Large jaw opening accommodating conductors up to two 500 kcmil
Improved ergonomic design and easy operation
High content nickel metal core
Conforms to EN 61010, 600 V CAT III
Low phase shift for power measurement
Designed for DMMs, recorders, loggers, oscilloscopes, power and harmonic meters
UL and CE mark

Specifications

Electrical parameters

Parameter	Value
Ratio	1000:1 or 2000:1 (customised)
Accuracy class	0.1 %, 0.2 %, 0.5 %
Primary current	0 to 1000 A AC
Secondary output	1 mV/A AC, 5 mV/A, 1 mA/A, 0.5 mA/A or customised
Maximum continuous input current	1200 A
Overvoltage category	CAT III 600 V
Output signal	333 mV, 500 mV, 1 V, 2 V, 5 V, 1 A, 5 A at nominal input
Frequency range	40 Hz to 20 MHz
Dielectric strength	3 kV 50/60 Hz for 1 minute
Temperature range	-20 °C to +55 °C
Output	2.5 m cable with D01 connector
Standard	EN 61010-1, EN 61010-2-032, IEC 60044-1

Accuracy and phase shift on the 1000 A range

Current	Accuracy	Phase shift
0 to 10 A	≤ 0.5 %	≤ 0.5°
10 to 100 A	≤ 0.2 %	≤ 0.2°
100 to 1200 A	≤ 0.1 %	≤ 0.1°

Mechanical parameters

Parameter	Value
Dimensions (L × W × H)	102.9 × 219.6 × 28 mm
Weight	550 g
Holding wire diameter	φ 50 mm
Maximum jaw opening	50 mm
Colour	Grey or blue
Material	PC + ABS + polycarbonate, UL94 V0

FAQ

Questions Buyers Ask

Why does phase shift matter on a current clamp?

Power is the product of voltage and current with the angle between them. A clamp with 1° of phase error will report real power wrongly even when the magnitude is right, which is why the JW is specified down to 0.1° above 100 A.

What output should I order?

Match the instrument input: 333 mV and 1 V suit most loggers and analysers, 1 mA/A suits DMMs, and 1 A or 5 A suit conventional panel instruments.

How big a conductor does the jaw take?

50 mm maximum jaw opening, which accommodates conductors up to two 500 kcmil.

Is it safe on a 600 V system?

The clamp conforms to EN 61010, 600 V CAT III, with a maximum of 600 V on non insulated conductors.