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Current Clamp Adaptors / Current Clamps

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100A-KC-BLU 100A-KC-BLU

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Megger 100A-KC-BLU - 100 A AC/DC Kelvin Clamp with Expandable Jaw (75mm/3in), Blue
Catalog: 100A-KC-BLU
  • Type (Current Clamp Adaptors: CT
  • Maximum Current AC: 500 mA (0.5 AWhat's This?)
  • Maximum Current DC: 200 A
  • Maximum Conductor Size: 3 IN
  • Shipping Weight: 0.5 LBS
  • Country of Origin: United States

Your Price: $133.00

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100A-KC-G 100A-KC-G

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Megger 100A-KC-G - 100 A AC/DC Kelvin Clamp with Expandable Jaw (75mm/3in), Green
Catalog: 100A-KC-G
  • Type (Current Clamp Adaptors: CT
  • Maximum Current AC: 500 mA (0.5 AWhat's This?)
  • Maximum Current DC: 200 A
  • Maximum Conductor Size: 3 IN
  • Shipping Weight: 0.5 LBS
  • Country of Origin: United States

Your Price: $133.00

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100A-KC-R 100A-KC-R

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Megger 100A-KC-R - 100A Kelvin Clamp - Affixed to Package (Red)
Catalog: 100A-KC-R
  • Type (Current Clamp Adaptors: CT
  • Maximum Current DC: 100 A
  • Maximum Conductor Size: 2.95 IN
  • Country of Origin: United States

Your Price: $133.00

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100A-KC-W 100A-KC-W

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Megger 100A-KC-W - 100 A AC/DC Kelvin Clamp with Expandable Jaw (75mm/3in), White
Catalog: 100A-KC-W
  • Type (Current Clamp Adaptors: CT
  • Maximum Current AC: 500 mA (0.5 AWhat's This?)
  • Maximum Current DC: 200 A
  • Maximum Conductor Size: 3 IN
  • Shipping Weight: 0.5 LBS
  • Country of Origin: United States

Your Price: $133.00

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100A-KC-Y 100A-KC-Y

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Megger 100A-KC-Y - 100 A AC/DC Kelvin Clamp with Expandable Jaw (75mm/3in), Yellow
Catalog: 100A-KC-Y
  • Shipping Weight: 0.50 LBS
  • Country of Origin: United States

Your Price: $133.00

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2002-786 2002-786

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Megger 2002-786 - Current Sensor Opening with (1.5 m) Lead
Catalog: 2002-786
  • Type (Current Clamp Adaptors: CT
  • HTS/Schedule B Number: 9030908060
  • Country of Origin: United States

Your Price: $730.00

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24-3001 24-3001

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AEMC 24-3001 - FlexProbe (300/3000Aac, 24", 10mV/A/1mV/A, Lead)
Catalog: 2120.81
  • Type (Current Clamp Adaptors: Flexible/Rogowski
  • Maximum Current AC: 3000 A
  • Maximum Conductor Size: 7.6 IN
  • Warranty: 12 MONTHS (1 YEARSWhat's This?)
  • Product Weight: 1.1 LBS
  • Shipping Weight: 6.00 LBS

List Price: $495.00

Your Price: $470.25

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246034 246034

(1 Review)

Megger 246034 - Miniature 1/2 in. CT (Current Transmitter)
Catalog: 246034
  • Type (Current Clamp Adaptors: CT
  • Maximum Current AC: 150 A
  • Maximum Conductor Size: 1.5 IN
  • Product Height: 0.50 IN
  • Product Length: 0.25 IN
  • Product Width: 7.50 IN

Your Price: $600.00

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3000 FC IND 3000 FC IND

(2 Reviews)

Fluke 3000 FC IND FC Wireless Industrial System
Catalog: 4465599
  • Type (Current Clamp Adaptors: CT
  • Maximum Current AC: 2500 A
  • Maximum Current DC: 400 mA (0.4 AWhat's This?)
  • Product Weight: 340 LBS
  • Product Height: 1.87 IN
  • Product Length: 8.17 IN

Your Price: $1,459.99

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30000-24-2-0.1 30000-24-2-0.1

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AEMC 30000-24-2-0.1 - AmpFlex 3000/30000A, 24", 1mV/0.1mV/A
Catalog: 2113.33
  • Type (Current Clamp Adaptors: Flexible/Rogowski
  • Maximum Current AC: 30000 A
  • Maximum Conductor Size: 8 IN
  • Warranty: 12 MONTHS (1 YEARSWhat's This?)
  • Product Weight: 4 LBS
  • Product Length: 24 IN

List Price: $509.00

Your Price: $483.55

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3000-24-1-1 3000-24-1-1

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AEMC 3000-24-1-1 - AmpFlex 3000A, 24", 1mV/A
Catalog: 2112.46
  • Type (Current Clamp Adaptors: Flexible/Rogowski
  • Maximum Current AC: 3000 A
  • Maximum Conductor Size: 8 IN
  • Warranty: 12 MONTHS (1 YEARSWhat's This?)
  • IP Rating: IP40
  • Product Weight: 2 LBS

List Price: $450.00

Your Price: $427.50

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3000-24-2-1 3000-24-2-1

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AEMC 3000-24-2-1 - AmpFlex 300/3000A, 24", 10mV/1mV/A
Catalog: 2113.05
  • Type (Current Clamp Adaptors: Flexible/Rogowski
  • Maximum Current AC: 3000 A
  • Maximum Conductor Size: 8 IN
  • Warranty: 12 MONTHS (1 YEARSWhat's This?)
  • IP Rating: IP40
  • Product Weight: 2 LBS

List Price: $495.00

Your Price: $470.25

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Recommended for you

Current Clamp Adaptors / Current Clamps

Current Clamp Adaptors, or simply Current Clamps, convert measured current signals into a voltage signal suitable for multimeters, oscilloscopes, data recorders and other test instruments

Considerations when buying a clamp adaptor
  • Do not compromise on safety
    Make sure the clamp meter has the correct rating. Check that the design will allow you to use the meter easily while wearing Personal Protective Equipment (PPE). Checkout the convenience of the flexible current clamps utilizing the Rogowski Principle and exciting new wireless models.
     
  • Make sure the clamp meter works where you do
    Check the specifications for the amperage and voltage range you will be working. Also consider the ambient temperature range if you will be working in a hot environment. Is it rated only for indoor use only?
     
  • Consider special features such as:
    • Flexible current clamp adaptors based on the Rogowski Principle
    • Current clamps that draw power from the conductor versus ones requiring batteries
How does a clamp adaptor work?

Clamp meters and adaptors measure this field using one of two technologies. For DC currents, "Hall Effect" is used, while for AC currents "Inductive" technology is used. Hall effect and induction are noncontact technologies based on the principle that for a given current flow, a proportional magnetic field is produced around the current-carrying conductor. Both technologies measure this magnetic field, but with different sensing methods

Hall Effect Technology
The Hall effect sensor consists of three basic components: the core, the Hall effect device, and signal conditioning circuitry. The current conductor passes through a magnetically permeable core that concentrates the conductor's magnetic field. The Hall effect device is carefully mounted in a small slit in the core, at a right angle to the concentrated magnetic field. A constant current in one plane excites it. When the energized Hall device is exposed to a magnetic field from the core, it produces a potential difference (voltage) that can be measured and amplified.

Inductive Technology
The ability of clamp meters to measure large ac currents is based on simple transformer action. AC current constantly changes potential from positive to negative and back again, generally at the rate of 50 Hz or 60 Hz. The expanding and collapsing magnetic field induces current in the windings. This is the principle that governs all transformers. When you clamp the instrument’s “jaws” around a conductor carrying ac current, that current is coupled through the jaws, similar to the iron core of a power transformer, and into a secondary winding which is connected across the shunt of the meter’s input. A much smaller current is delivered to the meter’s input due to the ratio of the number of secondary windings vs. the number of primary windings wrapped around the core.

Usually, the primary is represented by the one conductor around which the jaws are clamped. If the secondary has 1000 windings, then the secondary current is 1/1000 the current flowing in the primary, or in this case the conductor being measured. Thus, 1 amp of current in the conductor being measured would produce 0.001 amps or 1 milliamp of current at the input of the meter. With this technique, much larger currents can be easily measured by increasing the number of turns in the secondary.

What is the Rogowski Principle used by Flexible Current Clamps?
The flexible and lightweight measuring heads utilizing the Rogowski Principle allow quick and easy installation in hard to reach areas. The Rogowski current clamp is a toroidal coil. The magnetic field produced by the conductor induces a voltage proportional to the rate of change or derivative of the current (oops some calculus). The voltage is then integrated in a circuit (more calculus) to produce a linear voltage suitable for multimeters, oscilloscopes, and recorders.

See a Rogowski Flexible Clamp in action
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