Eigenschaften
Voltage warning indicator	Ja > 25 V
Dimensions / weight	240 x 185 x 110 mm / 3,4 kg

This accessory set consists of three test leads for the insulation testers C.A 6541 and C.A 6543 by Chauvin Arnoux. It includes two test leads, each 3 metres in length, colour-coded red and blue, as well as an additional Guard lead in black, also 3 m long. The connectors of the leads are straight, enabling direct and secure connection to the test instruments. The leads are specifically designed for use with the mentioned insulation testers, which are rated for test voltages from 50 V to 1000 V and perform resistance measurements in the range of 2 kΩ to 4 TΩ. The Guard lead suppresses leakage and surface currents at high insulation resistances, ensuring precise measurement results.

Applications
This accessory is intended for professional insulation testing in electrical engineering, particularly for inspecting electrical installations, machines, transformers, and cables. The 3-m length of the leads allows flexible handling, even with larger or hard-to-access test objects. The Guard lead is especially beneficial when measuring high-quality insulating materials or in environments with high humidity, as it improves measurement accuracy by reducing surface conductivity.

Functions and Equipment in Detail
The test leads are fitted with straight connectors that fit directly into the corresponding sockets of the insulation testers C.A 6541 and C.A 6543. The colour coding (red, blue, black) simplifies assignment of the leads to measurement points and supports correct wiring. The Guard lead is connected to the dedicated Guard terminal of the device to reliably perform insulation resistance measurements above 100 MΩ. The 3-m length provides sufficient clearance for testing in various environments, without the leads being excessively stretched or bent.

Technology Explained Simply
The Guard lead is an essential component when measuring high insulation resistances, as it suppresses surface leakage currents. At high resistances, surface conductivity caused by moisture or contamination can distort the measurement. The Guard lead blocks this path, ensuring that only the actual insulation resistance is measured. The leads themselves are designed for use with devices compliant with IEC 61010 600 V CAT III and IEC 61557, ensuring safe operation in industrial and electrical installations.

Compatibility and Accessories
The set is designed exclusively for the insulation testers C.A 6541 and C.A 6543. It complements the device functions, particularly when performing insulation tests with high resistances. These components can be used additionally depending on the application to optimise testing procedures.

Installation and Mounting
Installation is performed by simply plugging the leads into the corresponding terminals of the insulation tester. The connectors are designed to connect securely without requiring additional tools. The Guard lead is connected to the dedicated Guard terminal, while the red and blue leads are connected to the measurement terminals (+ and -) of the device. Correct assignment of colours and terminals is crucial for accurate measurement.

Operational Advantages
The 3-m length of the leads offers flexibility when testing installations that cannot be directly connected to the device. The Guard lead increases accuracy at high insulation resistances, which is particularly important when testing transformers, motors, or cables. Colour coding simplifies handling and reduces error sources. The leads are robust enough for field use and support reliable performance of insulation tests in various environments.

Display and Operation
The insulation testers C.A 6541 and C.A 6543 feature a large LCD display with bar graph, clearly and legibly showing measurement values. The devices offer functions such as automatic calculation of the polarization index (PI) and dielectric absorption ratio (DAR), programmable test duration, and a smoothing function for more stable displays. Voltage warning indication and test inhibition above 25 V provide additional safety. Power supply is via 8 LR14 batteries, allowing the devices to operate independently of mains voltage. Measurement values can be stored in an internal memory of 20 kilobytes, with up to 20 measurement results being saved. The devices are designed for use in environments rated 600 V CAT III according to IEC 61010 and IEC 61557, ensuring high safety standards.

Electrical Safety
The devices C.A 6541 and C.A 6543 comply with standards IEC 61010 600 V CAT III and IEC 61557, enabling safe operation in electrical installations with high voltages. Voltage warning indication and test inhibition above 25 V support safe operation. The devices are designed for use in industrial and technical environments where high electrical safety requirements apply.

Dimensions and Weight
The insulation testers C.A 6541 and C.A 6543 have dimensions of 240 x 185 x 110 mm and weigh 3.4 kg. The devices are compact and easy to handle, making them suitable for mobile use. The robust construction allows use under adverse environmental conditions.

Note: Batteries are not included in the delivery scope.