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Flexible Current Transformer, 10000A AC, 12mm

The flexible current transformer measures AC currents for power metering, power quality analysis and general purpose applications, with a coil diameter of Φ12mm and a response frequency of 0.1Hz to 1MHz, which provides a versatile solution when space is limited and a rope CT is needed to physically wind irregularly shaped conductors or wires.
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High precision flexible current transformer range 0A~10000A, coil diameter 12mm, coil inner diameter 200mm-3000mm optional, with integrator easy to integrate into other equipment, such as phase detection analyzer, industrial control device, data logger, oscilloscope, etc.

Flexible current transformer 12mm

Non-contact measurement, safe and reliable.

  • The flexible coil current transformer consists of a coil and a handle, without any exposed metal conductor in the coil part, non-contact measurement, safe and reliable.
  • The flexible current transformer is small, light, flexible, and suitable for narrow environments and densely lined places, as well as for measuring conductor currents of large size or irregular shape.
  • Wide measurement range, high accuracy, high reliability, and wide response band. It is especially suitable for relay protection, silicon-controlled rectification, frequency control, semiconductor switching, power electronic conversion equipment, arc welding, and other industrial environments with severe signal distortion.


Flexible current transformers are an indispensable accessory for small, medium, and large electronic companies. The sisco flexible current transformer is suitable for use in power equipment testing, communications and telecommunications, railway and oilfield monitoring, building and construction companies, research and teaching units, industrial and mining records, and other fields.  

Clamp-on current transformer applications

Measuring Range AC 0A~10000A
Coil Diameter 12mm
Resolution 10mA
Accuracy Level 1%FS (50Hz/60Hz; 23°C to 2°C, below 70%RH, wire in the center of the coil)
Phase Error ≤0.1°(50Hz/60Hz; 23℃±2℃)
Integrator Output Connector 3.5mm audio plug/BNC connector/bare wire(optional)
Wire Length 2M
Integrator Mass Approx. 205g
Integrator Output Connector 3.5mm audio plug/BNC connector/tip (optional)
Integrator Output Cable Length 2m
Electric Field Interference No hysteresis effect, no external electric field interference
Wire Position The test wire is in the center of the coil, position error ≤ 0.5% FS
Response Frequency 0.1Hz ~ 1MHz
Line Voltage AC 1000V or less line test
Random Accessories Flexible coil x 1, integrator x 1, 6F229V battery x 1
Working Temperature and Humidity -20℃~50℃; 80%rh or less
Storage Temperature and Humidity  -10℃~60℃;70%rh below
Dielectric Strength AC 2000V/rms (both ends of the coil after unlocking and unfolding)
Safety Regulation CAT IV 500V, CAT Ⅲ 1000V

Model (optional)

Model Coil Inner Diameter Coil Length Coil Mass
SISCO-ETCR200FB Φ200mm 640mm  212g
SISCO-ETCR300FB Φ300mm 950mm 274g
SISCO-ETCR500FB Φ500mm 640mm 400g
SISCO-ETCR1000FB Φ1000mm 3150mm 715g
SISCO-ETCR2000FB Φ2000mm 6300mm 1340g
SISCO-ETCR3000FB Φ3000mm 9420mm 1790g

Integrator Output Connector

Flexible current transformer integrator output connector


Q1: What is a flexible current transformer?
A1: A flexible current transformer is an AC current sensor consisting of a toroidal coil uniformly wound on a non-ferromagnetic material and an integrator. The output signal is the differentiation of current against time and can be directly applied to the conductor being measured to measure AC current.

Q2: What are the advantages of flexible current transformers?
A2: Flexible current transformers are essentially just a pair of cables, allowing you to easily reach even the tightest sections. This feature is also particularly handy when you are working in high places. The design of the flexible current transformer eliminates the risk of encountering a secondary open circuit. As a result, the risk of electrocution or transformer overload is mitigated. Of course, this doesn't mean you can be lax about safety procedures, but it does provide a sense of security when working.

Q3: What are the wiring methods of current transformers?
A3: There are two types of current transformer wiring, the first is the use of two current transformers two-phase V-shaped wiring and two-phase current differential wiring, and the second is the use of three current transformers three-phase Y-shaped wiring, three-phase triangle wiring, and zero sequence wiring.

Tips: Notes on the use of flexible current transformers current transformers

Generally speaking, the flexible current transformers current transformer is connected in accordance with the minus polarity, so the polarity connection should be correct, once the connection is wrong, resulting in inaccurate measurement, or even a short circuit.

In order to avoid the secondary winding leading to high-voltage electricity into the low-voltage side, the instrument damage, and personal injury, should be set to protect the ground.

For the use of an energy metering transformer, if the secondary circuit is, then no automatic device is required.


Thank you for buying industrial test and measurement equipment on, all products sold by sisco and the partner cover a 12 months warranty, effective from the date of receiving the products.

What is covered?

sisco is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

What is not covered?

  • Product purchased from anyone other than a sisco store or a sisco authorized reseller.
  • Expendable parts.
  • Routine cleaning or normal cosmetic and mechanical wear.
  • Damage from misuse, abuse or neglect.
  • Damage from use of parts other than sisco approved.
  • Damage from use outside the product’s usage or storage parameters.
  • Damage from use of parts not sold by sisco.
  • Damage from modification or incorporation into other products.
  • Damage from repair or replacement of warranted parts by a service provider other than a sisco authorized service provider.
  • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
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