General
Rated current	2000 A AC
Enclosure dimensions	64 x 150 mm
Measurement ranges	0,1 A–36 A | 1 A–360 A | 1 A–3600 A

The Chauvin Arnoux clamp D37N is a clamp current transformer for accurate measurement of alternating currents in industrial and technical applications. The device is specifically designed for use with thick cables and busbars, where the rectangular shape of the clamp jaws enables secure encirclement of large conductor cross-sections. The "D" model series is characterised by high measurement accuracy, achieved through the quality of the magnetic circuits and distributed windings.

Applications

The clamp current transformer D37N is suitable for measuring medium to high alternating currents up to 3000 A. It is commonly used in electrical engineering, for plant maintenance, in power supply systems, and for monitoring electricity consumption in industrial environments. The encirclement dimensions of 64 x 150 mm allow measurement on conductors with large cross-sections, such as those found in enclosures or main lines.

Functions and equipment in detail

The device features three measurement ranges, enabling improved measurement resolution and accuracy. The measurement ranges are 0.1 A to 36 A, 1 A to 360 A, and 1 A to 3600 A. Typical accuracy is ≤ 2 %, which is sufficient for precise measurements in technical installations. The output signal is an alternating voltage, delivered via insulated sockets with a diameter of 4 mm. These sockets enable a safe and reliable connection to measuring or recording instruments.

Technology explained simply

The clamp current transformer operates on the principle of a transformer: the current to be measured flows through the clamp, generating a magnetic field in the magnetic circuit. This induces a voltage in the secondary winding, proportional to the primary current. The turns ratio is 30 A/3 V, 300 A/3 V, and 3000 A/3 V, meaning that depending on the measurement range, a specific voltage value is generated per current strength. The output voltage is delivered via the 4 mm sockets, with insulation ensuring safe handling.

Compatibility and accessories

To extend application possibilities, a set of two adapters (BNC socket/4 mm plug) is available. These adapters enable connection of the clamp current transformer to measuring instruments with BNC connectors, thereby expanding compatibility with various measuring systems.

Installation and mounting

Installation is performed by simply encircling the conductor to be measured with the clamp. No additional mounting or fastening is required. The clamp can be directly applied to the cable or busbar, with the rectangular shape ensuring secure positioning. Measurement is contactless, eliminating the need to interrupt the current circuit.

Advantages in operation

The clamp current transformer D37N offers high measurement accuracy combined with great flexibility due to the three measurement ranges. The insulated output sockets ensure a safe connection, and the rectangular shape of the clamp allows measurement on large conductors. Use in combination with suitable accessories such as the BNC adapters extends application possibilities. The rated current is 2000 A AC, with maximum measurable current up to 3000 A AC. The devices are designed for an operating voltage of 600 V CAT III, making them suitable for use in industrial installations.