General
Enclosure diameter	52 mm
Maximum current load for 40 minutes	1200 A
Vibration test	5/15 Hz 1,5 mm; 15/25 Hz 1 mm; 25/55 Hz 0,25 mm

The C112 clamp current transformer from Chauvin Arnoux is a precise measuring instrument for capturing alternating currents in the range of 1 mA to 1200 A. It belongs to the "C" series and is specifically designed for applications in industrial and office buildings where high measurement accuracy and safety are required. The device enables CAT III 600 V measurements, making it suitable for use on electrical installations in industrial and service facilities. The clamp features a jaw opening diameter of 52 mm, allowing most conductors in typical installations to be measured without interrupting the power supply.

Applications

The C112 is ideal for precise alternating current measurements in industrial and commercial electrical installations. It is particularly suitable for power measurements where high linearity and low phase shift are required. Application areas include monitoring power consumption, diagnosing faults in electrical systems, as well as calibrating and validating measuring instruments. The safety category CAT III 600 V makes it suitable for measurements on distribution lines and main lines in buildings.

Functions and Equipment in Detail

The C112 is equipped with a µ-metal core that ensures high linearity and improves accuracy in power measurements. The round shape of the clamp jaws and the uniform winding of the coil ensure minimal phase shift and high measurement accuracy. The device features a pendulum hinge system that precisely aligns the magnetic components, and a patented support system that enables progressive, stepless opening of the clamp jaws. This facilitates handling and reduces effort when opening and closing the clamp.

Technology Explained Simply

The clamp current transformer operates on the principle of a current transformer. The conductor to be measured is inserted into the clamp, generating a magnetic field that is induced in the core of the clamp. This field is converted via the coil into a proportional output signal, which is delivered through the 4 mm insulated sockets. The turns ratio is 1000:1, meaning that a current of 1000 A at the input generates an output signal of 1 A. Typical accuracy is ≤ 0.3 %, which is sufficient for precise measurements in technical applications. The output sockets are equipped with overvoltage protection to safeguard the connected measuring device.

Compatibility and Accessories

The C112 is compatible with a wide range of measuring instruments, including multimeters, power meters, recording devices, and oscilloscopes. The 4 mm sockets enable a secure and standardized connection. As suitable accessories, a set of two adapters (BNC socket/4 mm plug) is offered, enabling connection to devices with BNC connectors. These adapters extend the application possibilities of the C112 in systems using BNC connectors.

Mounting and Installation

Installation is carried out by simply inserting the conductor to be measured into the clamp. The clamp is closed around the conductor, with the pendulum hinge system and progressive opening system ensuring easy and safe handling. No additional mounting or installation is required. The clamp can be operated directly on the line without interrupting the power supply.

Operational Advantages

The C112 offers high measurement accuracy, low phase shift, and a robust construction. The ergonomic design with integrated opening system reduces physical strain during use. The safety approval according to IEC 61010, CAT III 600 V, ensures safe operation in industrial environments. The 4 mm sockets with overvoltage protection safeguard the connected device against transient voltage surges. The clamp is designed for use in environments with an operating temperature of -10 °C to +50 °C and can be operated at a relative humidity of 0 to 85 % RH.

Scope of Delivery

The scope of delivery includes the current clamp C112 and the operating instructions.

Safety and Standards

The device complies with the safety requirements of the IEC 61010 standard and is approved for use in safety category CAT III 600 V. The protection class IP40 protects against contact with moving parts and against solid objects larger than 1 mm. The clamp is designed for use in environments with an operating temperature of -10 °C to +50 °C and can be operated at a relative humidity of 0 to 85 % RH. The maximum operating altitude is 2000 m above sea level.

Dimensions and Weight

The dimensions of the clamp are 216 mm (length) × 111 mm (width) × 45 mm (height). The weight is 550 g. The color scheme is dark gray with red clamp jaws. The maximum jaw opening is 53 mm, with a maximum encircling diameter for conductors of 52 mm. For busbars, the clamp is designed for a single busbar of 50 mm × 5 mm or four busbars of 30 mm × 5 mm.