General
Rated current	2400 A AC
Enclosure dimensions	64 x 150 mm
Drop test	500 mm
Maximum cable diameter	64 mm
Ampere-second product	90 A·s

The D34N clamp current transformer from Chauvin Arnoux is a measuring instrument for the accurate detection of alternating currents in industrial and technical applications. It is specifically designed for measuring medium and high currents on thick cables as well as on busbars. The rectangular shape of the clamp jaws allows for secure and precise encirclement of conductors with a maximum cross-section of 64 mm diameter or 64 x 100 mm for multiple conductors. The magnetic circuits and distributed windings ensure high measurement accuracy and minimize phase shifts. The device is designed for use in electrical installations with an operating voltage of 600 V CAT III, making it suitable for industrial environments.

Applications
The D34N clamp current transformer is used in electrical and measurement technology, particularly for monitoring and diagnosing current consumption in industrial plants, for maintenance of power supply systems, and for measuring alternating currents in high-performance systems. The rectangular shape of the clamp jaws enables measurement on busbars and thick cables that would not be accessible for round clamps. The measurement ranges of 1 A to 600 A, 1 A to 1200 A, and 1 A to 1800 A offer flexibility for adapting to different loads.

Functions and Equipment in Detail
The device features three measurement ranges with transformation ratios of 500/5, 1000/5, and 1500/5. Accuracy is ≤ 3 % for the range up to 600 A, 1 % for the range up to 1200 A, and 0.5 % for the range up to 1800 A. The output signal is an alternating current delivered via insulated sockets with a diameter of 4 mm. These sockets enable a secure connection to measuring instruments such as multimeters, harmonic or power meters, and data acquisition systems. An integrated overvoltage protection at the output protects the device and connected equipment from damage due to high voltages.

Technology Explained Simply
The clamp current transformer operates on the principle of a current transformer: the current to be measured flows through the clamp, generating a proportional magnetic field in the magnetic circuit. This induces a current in the secondary circuit, which is delivered via the sockets. The transformation ratios determine how much the primary current is reduced to the secondary current. Accuracy is influenced by the quality of the magnetic cores and the winding arrangement. The device’s bandwidth ranges from 30 Hz to 5 kHz, with the maximum measurable current limited during continuous use above 1 kHz. The maximum output voltage under open secondary circuit conditions is electronically limited to a maximum of 42 V peak.

Compatibility and Accessories
The D34N clamp current transformer is compatible with measuring instruments that support an alternating current input via 4 mm sockets, such as multimeters, power meters, or data acquisition systems. As accessories, a set of two adapters (BNC socket / 4 mm plug) is offered, enabling connection to devices with BNC connectors. These adapters expand the device’s application possibilities, especially when used with oscilloscopes or other devices with BNC inputs.

Mounting and Installation
Installation is performed by simply encircling the conductor to be measured with the clamp. The rectangular shape of the jaws allows for secure positioning on thick cables and busbars. It is important to ensure the conductor is centrally positioned within the clamp to avoid measurement errors caused by asymmetrical placement. The clamp is designed for an operating temperature of -10 °C to +50 °C and can be stored at a storage temperature of -25 °C to +80 °C. Mechanical robustness is ensured by a drop test of 500 mm and an impact resistance of 100 g according to IEC 68-2-27.

Advantages in Operation
The D34N clamp current transformer offers high measurement accuracy, especially at high currents, and enables measurement on difficult-to-access conductors thanks to the rectangular shape of the clamp jaws. The integrated overvoltage protection function increases operational safety. The use of insulated 4 mm sockets ensures a secure and reliable connection to measuring instruments. The bandwidth of 30 Hz to 5 kHz makes the device suitable for measuring alternating currents at higher frequencies, for example in systems with frequency converters. The rated current is 2400 A AC, with a maximum measurement up to 3000 A AC possible at temperatures below 35 °C.