General
Rated current	2400 A AC
Measurement range	1…3600 A AC
Enclosure dimensions	64 x 150 mm

The Chauvin Arnoux D33N clamp is a current transformer for the accurate measurement of alternating currents in industrial and technical installations. With its rectangular clamp shape, it enables precise current measurement on thick cables and busbars, where conventional round clamps no longer fit. The clamp is designed for use in electrical installations with high current levels ranging from 1 A to 3600 A AC, with a nominal current of 2400 A AC. Measurement is performed using an inductive principle, where the magnetic flux of the measured current in the clamp generates a secondary current, which is converted into a measurable output signal via the transformation ratio 3000/5.

Applications

The D33N clamp is suitable for applications in power supply, industrial electrotechnics, and maintenance of electrical installations. It is particularly used where large cross-sections of cables or busbars need to be measured, for example in enclosures, transformer stations, or during maintenance of machines with high power consumption. The rectangular shape of the clamp jaws with enclosure dimensions of 64 x 150 mm ensures secure and stable clamping, even on irregularly shaped conductors.

Functions and Equipment in Detail

The current transformer provides an alternating current output signal delivered via insulated sockets with a diameter of 4 mm. These sockets enable a safe and reliable connection to measuring instruments or control systems. The typical accuracy is ≤ 1 %, ensuring high measurement reliability for monitoring and diagnosing electrical systems. An integrated overvoltage protection at the output protects connected devices from transient voltage spikes that may occur during sudden load changes or short circuits.

Technology Explained Simply

The clamp operates on the principle of a current transformer, where the current to be measured flows as primary current through the clamp and generates a magnetic field. This field induces a current in the secondary winding, proportional to the primary current. The transformation ratio 3000/5 means that a primary current of 3000 A generates a secondary current of 5 A. This signal is transmitted to external measuring instruments via the 4 mm sockets. The distributed winding and the quality of the magnetic circuits ensure uniform and distortion-free signal transmission, even at high currents.

Compatibility and Accessories

The D33N clamp is compatible with measuring instruments featuring an alternating current input with 4 mm socket connectors. As an accessory, a set of two adapters (BNC socket / 4 mm plug) is available, enabling connection to devices with BNC connectors. These adapters expand the application possibilities of the clamp, especially when integrating into existing measurement systems.

Mounting and Installation

The clamp is simply placed around the conductor to be measured, with the rectangular shape ensuring secure clamping even on irregular cross-sections. No additional mounting or fastening is required; the clamp holds in place due to its shape and the magnetic principle. Connection to the measuring device is made via the 4 mm sockets, which are directly connected to the device.

Operational Advantages

The D33N clamp offers high measurement accuracy at high currents, which is crucial for diagnosing and maintaining electrical installations. Its robust construction and integrated overvoltage protection increase operational safety. The rectangular shape extends the application range to thicker cables and busbars, where other clamps no longer fit. The use of insulated sockets minimizes the risk of short circuits and enhances operational safety.

Protection Rating and Safety

The clamp is designed for use in electrical installations with an overvoltage category CAT III 600 V. This means it is suitable for measurements in medium voltage ranges where high transient voltages may occur. The construction ensures safe and reliable measurement under real operating conditions.