General
Model	C122
Enclosure diameter	52 mm

The C122 current transformer from Chauvin Arnoux is a measuring device for precise detection of alternating currents in the range of 1 A to 1200 A. It is specifically designed for industrial and commercial applications where high measurement accuracy and safety are required. The device features a round clamp construction with a clamping diameter of 52 mm, allowing it to encircle conductors up to 52 mm in diameter without requiring a complete interruption of the power supply. The uniform winding ensures minimal phase shift, resulting in high measurement accuracy stated by the manufacturer as ≤ 1 %. This makes the current transformer particularly suitable for precise current measurements in CAT III 600 V environments, as commonly found in industrial and office buildings.

Applications

The C122 current transformer is used in electrical engineering to monitor current consumption or flow in electrical installations. It is especially useful for diagnosing current consumers, energy efficiency analysis, or checking switchgear. Due to its safety category CAT III 600 V, it can be used in environments with increased electrical risk, provided the required safety regulations are followed. The robust construction and pivot hinge system enable easy handling, even in hard-to-reach locations, as the clamp jaws can be opened progressively.

Functions and Equipment in Detail

The device operates as a current transformer and converts the primary alternating current in the measurement range of 1 A to 1200 A into a proportional output signal. The turns ratio is 1000/5, meaning that an input current of 1000 A generates an output signal of 5 A. This signal is output via insulated sockets with a diameter of 4 mm. The sockets are equipped with overvoltage protection to safeguard the device and connected measuring instruments from transient voltage spikes. The output signals are also alternating current, ensuring compatibility with standard measuring instruments.

Technology Explained Simply

A current transformer operates on the principle of a transformer: the conductor to be measured acts as the primary winding conductor, and the clamp encircles it, generating a magnetic field. This field induces a proportional current signal in the secondary winding (inside the clamp). The accuracy of ≤ 1 % and minimal phase shift are crucial for measurement reliability, especially when analyzing loads or determining losses. The insulated sockets with overvoltage protection increase safety by blocking unwanted voltage spikes that may arise from switching operations or disturbances.

Compatibility and Accessories

The C122 current transformer is designed for use with standard measuring instruments that have alternating current inputs with a cable cross-section of up to 4 mm Ø. It is part of the "C" series from Chauvin Arnoux and can be used in combination with other products from this series to build comprehensive measuring systems. The safety category CAT III 600 V allows use in installations classified under this category, such as in distribution switchgear or industrial machines.

Mounting and Installation

Installation is performed by simply clamping the conductor to be measured with the clamp. The opening of the clamp jaws is controlled by a pivot hinge system and a patented support system, enabling uniform and precise opening. It is important that the conductor is fully enclosed within the clamp and no air gaps are present to avoid measurement errors. The clamp should be mounted perpendicular to the conductor to ensure optimal magnetic coupling.

Advantages in Operation

The C122 current transformer offers high measurement accuracy, robust construction, and easy handling. The integrated overvoltage protection increases safety for the device and connected measuring instruments. The safety category CAT III 600 V allows use in hazardous environments without requiring additional protective measures. The uniform winding and pivot hinge system ensure precise and reliable measurements, even in difficult-to-access locations.

Scope of Delivery

The scope of delivery includes the C122 current transformer with insulated sockets and overvoltage protection. The information refers exclusively to the described device.