General
Rated current	10 A AC

The clamp current transformers of the MN series from Chauvin Arnoux are designed for measuring alternating currents up to 240 A and can be connected to a multimeter or a power analyzer. The MN71 model is specifically developed for use on the secondary side of current transformers to precisely measure current strength in these circuits. The compact and ergonomic design enables measurements in hard-to-reach locations, with the clamp capable of enclosing cables with a maximum diameter of 20 mm. The clamp is suitable for use in electrical installations of category CAT III 600 V or CAT IV 300 V, ensuring safe measurement in industrial and commercial environments.

Applications

The MN71 clamp is primarily intended for measuring alternating currents in the secondary circuit of current transformers. This application is typical in power supply technology, transformer monitoring, or industrial electrical engineering, where precise detection of secondary currents is important for diagnosis and maintenance. The clamp is also suitable for general current measurements in installations up to CAT III 600 V or CAT IV 300 V, especially where a compact and portable measuring clamp is required.

Functions and Equipment in Detail

The MN71 clamp provides an output signal in the form of an alternating voltage, proportional to the measured alternating current. The ratio between output signal and input current is 100 mV per ampere of alternating current (100 mV/A AC). This linear relationship allows for simple and accurate conversion of the measured voltage value into the actual current value. The rated current is 10 A AC, indicating the maximum current the clamp can measure safely and accurately. The output signal is transmitted via a cable with an insulated connector of 4 mm diameter, which connects to a measuring device.

Technology Explained Simply

The clamp operates on the principle of a current transformer: when a current-carrying conductor is passed through the clamp, the current generates a magnetic field that induces a voltage in the clamp. This voltage is proportional to the current in the conductor and is transmitted via the cable to the measuring device. The clamp is designed for alternating currents, as only alternating current produces a changing magnetic field, enabling induction. The insulation of the 4 mm diameter connector ensures a safe connection to the measuring device, especially in environments with increased electrical hazards.

Compatibility and Accessories

The MN71 clamp is compatible with multimeters and power analyzers that can receive an input signal in the form of alternating voltage. No additional accessories are required, as the clamp is already equipped with the necessary cable and connector. Measurement is performed directly via the clamp, without requiring additional adapters or converters. The clamp is not suitable for direct current measurements, as no induced signal is generated.

Mounting and Installation

Installation of the clamp is performed by simply clamping around the conductor to be measured. The clamp opens mechanically, allowing the cable to be inserted, and closes automatically. The maximum jaw opening of 20 mm enables measurement on cables with medium to large cross-sections. The clamp is designed for use in electrical installations up to CAT III 600 V or CAT IV 300 V, ensuring safe handling in industrial and commercial environments. No additional tools or mounting aids are required.

Advantages in Operation

The MN71 clamp offers a compact and ergonomic design, enabling safe and comfortable handling even in tight or hard-to-reach areas. Direct current measurement without interrupting the circuit is a key advantage, as measurements can be performed without stopping the system. The clear signal transmission via the cable with an insulated connector ensures a reliable and safe connection to the measuring device. The clamp is specifically optimized for the secondary side of current transformers, enabling precise measurement in these applications.