General
Enclosure diameter	52 mm

The C148 current transformer from Chauvin Arnoux is a precise measuring instrument from the "C" series, designed for measuring alternating currents in the range of 1 A to 1200 A. The device is particularly suitable for use in industrial and office buildings, where it can be applied to conductors with a maximum encirclement diameter of 52 mm. Measurement is performed contactlessly via the jaw clamps, with the round shape of the jaws and the uniform winding ensuring high measurement accuracy and minimal phase shift. The safety class CAT III 600 V allows use on electrical installations in industrial and commercial electrical engineering.

Applications

The C148 is designed for precise alternating current measurements in electrical installations, particularly in industrial and service facilities. The clamping capacity of 52 mm allows measurement on most common conductors found in these environments. The safety approval according to IEC 61010, CAT III 600 V, makes the device suitable for measurements on electrical installations operated under these conditions.

Functions and Equipment in Detail

The device offers three selectable measurement ranges: 1 A to 300 A, 1 A to 600 A, and 1 A to 1200 A. The transformation ratios are 250/5, 500/5, and 1000/5, with typical accuracy varying between ≤ 2 % and ≤ 1 % depending on the range. Output is provided via 4-mm insulated sockets, equipped with integrated overvoltage protection to enhance safety during measurement. The patented support system and pendulum hinge system enable smooth, supported opening of the jaw clamps, improving handling.

Technology Explained Simply

The current transformer operates on the principle of a current transformer. The current to be measured flows through the jaw clamps, generating a magnetic field inside the device. This induces a proportional output signal in the secondary winding, which is delivered as alternating current via the 4-mm sockets. The round shape of the jaws and the uniform winding minimize distortions and ensure stable, precise measurement. The transformation ratios allow adaptation to different measurement ranges, with the output signal scaled accordingly.

Compatibility and Accessories

The device is designed for use with measuring instruments equipped with 4-mm connectors. Suitable accessories include a set of two adapters (BNC socket/4mm plug), enabling connection to devices with BNC connectors.

Mounting and Installation

Installation is performed by simply clamping the conductor to be measured with the jaw clamps. The opening of the jaws is facilitated by the pendulum hinge system and support system, allowing precise positioning even in tight spaces. No additional tools or mounting aids are required.

Operational Advantages

The combination of high measurement accuracy, minimal phase shift, and the robust design of the 4-mm sockets with overvoltage protection ensures reliable results. The ergonomic design and pendulum hinge system improve handling, especially with frequent use. The three measurement ranges allow flexible adaptation to different operational requirements.

The delivery includes the current transformer C148 and the operating instructions. The instructions contain information on correct handling and maintenance of the device.