General
Enclosure diameter	16 mm
Drop test	1,5 m
Vibration test	5–15 Hz (1,5 mm), 15–25 Hz (1 mm), 25–55 Hz (0,25 mm)

The MINI 103 current transformer from Chauvin Arnoux is a compact and easy-to-handle accessory for AC current measurement in the range of 0.1 A to 200 A AC. It is specifically designed for use in commercial and industrial applications with low to medium power, where precise and safe current measurements are required in confined installations such as enclosures, control systems, or distribution boxes. The device features a compact design that allows for easy handling and installation in tight spaces. The clamping opening, with a maximum diameter of 16 mm, enables the measurement of conductors commonly found in typical electrical installations. The output signals are provided as AC voltage via a connected cable with an insulated 4-mm plug, enabling connection to multimeters or other measuring instruments with voltage input. The turns ratio is 1 A / 1 mV, meaning that each ampere at the input generates 1 millivolt at the output. The typical measurement accuracy is ≤ 1.5 %, which is sufficient for many industrial applications. An integrated overvoltage protection safeguards the device and the connected measuring instrument when the clamp is disconnected from a conductor with voltage applied. This enhances operational safety and prevents damage from unexpected voltage surges.

Applications

The MINI 103 is ideal for measuring AC currents in electrical installations within the commercial and industrial sectors. It is particularly suitable for applications where current levels range from a few hundred milliamperes up to 200 amperes, such as in control systems, small motors, lighting systems, or during maintenance of distribution enclosures. The compact design allows for measurements in tight installations where larger clamps cannot fit. The use with multimeters featuring a voltage input is standard, enabling direct display of current values.

Functions and Equipment in Detail

The device features an integrated overvoltage protection that safeguards both the device and the connected measuring instrument when the clamp is disconnected from a conductor with voltage applied. The output signal is transmitted via a cable with an insulated 4-mm plug, ensuring a safe and reliable connection. The clamp is designed for use with devices that have a voltage input, allowing current values to be displayed via conversion of the output signal (1 A = 1 mV). The measurement accuracy of ≤ 1.5 % is sufficient for many industrial applications and ensures reliable results. The maximum clamping opening of 16 mm allows measurement of conductors commonly found in typical electrical installations.

Technology Explained Simply

The current transformer operates on the principle of a current transformer: when a conductor carrying current is passed through the clamp, a magnetic field is generated, inducing a voltage in the secondary winding of the transformer. This voltage is proportional to the current in the conductor. The turns ratio of 1 A / 1 mV means that for every ampere of current in the conductor, 1 millivolt of voltage is generated at the output. This signal is transmitted via the connected cable with a 4-mm plug to a measuring instrument. The clamp is designed for AC current, so the output signal is also an AC voltage. The integrated protection function prevents damage to the device or the connected measuring instrument when disconnecting the clamp from a conductor with voltage applied.

Compatibility and Accessories

The MINI 103 is designed for use with multimeters and other measuring instruments that have a voltage input. Connection is made via the supplied cable with an insulated 4-mm plug. The clamp is not suitable for DC measurements, as it is exclusively designed for AC. Compatibility with devices having current or voltage inputs is ensured, provided the device’s input specifications match the output signal of the clamp. The clamp is part of the MINI series, known for its compact design and reliability.

Installation and Mounting

Mounting is done by clamping the conductor to be measured. The clamp is simply opened, the conductor inserted, and the clamp closed again. The conductor should be positioned centrally within the clamp to avoid measurement errors caused by uneven field distribution. Connection to the measuring instrument is made via the supplied cable with a 4-mm plug. The clamp is designed for use in electrical installations complying with 600 V CAT III and 300 V CAT IV standards. The operating temperature range is from -10 °C to +50 °C, and the storage temperature range is from -40 °C to +80 °C. The clamp is suitable for use up to an altitude of 2000 m above sea level.

Operational Advantages

The compact design and low weight of approximately 180 g enable easy handling, even in confined spaces. The integrated protection function enhances operational safety, especially when disconnecting from conductors with voltage applied. The high reliability and precise measurement within the range of 0.1 A to 200 A AC make the MINI 103 a dependable tool for daily use in electrical engineering. Use with multimeters is standard, allowing direct display of current values. The clamp is designed for commercial and industrial applications where precise and safe current measurement is required.

Scope of Delivery

The scope of delivery includes the MINI 103 current transformer, the connection cable with 4-mm plug, and the operating instructions. These components are intended for immediate use and enable quick commissioning.

Safety Standards

The device complies with safety standards EN 61010-1, EN 61010-2-031, and EN 61010-2-032. It is rated for categories 600 V CAT III and 300 V CAT IV, enabling use in electrical installations with corresponding voltage classes. Electromagnetic compatibility is certified according to EN 61326-1, minimizing interference from electromagnetic fields. The clamp features double or reinforced insulation, ensuring high safety during operation.

Protection Rating and Environmental Conditions

The protection rating is IP40, meaning the device is protected against solid objects with a diameter of at least 1 mm, but not against water. The operating temperature range is from -10 °C to +50 °C, and the storage temperature range is from -40 °C to +80 °C. The relative humidity during operation is up to 85 % RH, with a linear decrease above 35 °C. The clamp is suitable for use up to an altitude of 2000 m above sea level. Mechanical robustness is ensured by a drop test from 1.5 m and an impact resistance of 100 g / 6 ms / half period. Vibration testing is performed according to IEC 68-2-6 with frequencies of 5–15 Hz (1.5 mm), 15–25 Hz (1 mm), and 25–55 Hz (0.25 mm).