The voltage tester C.A 771 from Chauvin Arnoux is a professional measuring instrument for the safe verification of voltage absence in electrical installations, devices and circuits. It serves as a central tool for electricians to confirm the absence of voltage before working on systems connected to the power grid. The device complies with standards EN 61243-3:2010 and IEC 61010 CAT IV 1000 V and is therefore suitable for use in high-voltage environments up to 1000 V CAT IV. The protection rating IP65 ensures dust-tight and splash-proof operational safety, even outdoors. The extended climate class S allows operation at temperatures from -30 °C to +60 °C, enabling use under extreme environmental conditions.

Applications

The C.A 771 is used in electrical installation, maintenance work on electrical systems, and safety inspections. It is suitable for testing network circuits, devices, sockets and other electrical installations. The functions include voltage detection, phase detection, continuity testing, rotation direction testing, and testing of residual current circuit breakers. Testing is carried out in accordance with the requirements of standards EN 50110-1, DIN VDE 0682-401 and NF C 18-510.

Functions and Equipment in Detail

The device detects voltages in the range of 12 V AC to 1000 V AC and 12 V DC to 1400 V DC. The frequency ranges include direct current (DC) and alternating current from 16 2/3 Hz to 800 Hz. Voltage detection is indicated optically via LEDs and acoustically via an intermittent beep. A redundant display via the ELV-LED (Extra Low Voltage) signals voltages above 50 V AC or 120 V DC, with the blink frequency proportional to the voltage level. Phantom voltage detection is activated by switching to a low-ohmic load, providing additional safety. The polarity indication allows differentiation between live and neutral conductors.

Technology Explained Simply

The C.A 771 features a complete self-test that checks the electrical circuits, power supply, displays and condition of the test leads. This ensures the device is functional before each measurement. Continuity testing is performed with acoustic and optical signals for resistances below 100 Ω. Additionally, the device offers extended continuity testing with optical indication for resistances below 2 kΩ, 60 kΩ and 300 kΩ. Rotation direction testing is performed using the 2-wire method, controlled by a microprocessor, and requires no additional hand. Testing of residual current circuit breakers is activated by simultaneously pressing both buttons, requiring two-hand operation and thus providing an additional safety level. The test simulates a fault current of approximately 30 mA at 230 V.

Compatibility and Accessories

The test probes are removable and can be replaced with various models, including versions with 2 mm Ø, 4 mm Ø, IP2X protection or specifically for CAT IV applications. The test probes can be mounted at two clip positions with spacings of 16 mm or 19 mm, enabling adaptation to different application scenarios. The socket adapter C.A 753 is available as an optional accessory, simplifying testing of earthed sockets according to European standards (Type E and F). Compatible accessories include protective covers for test probes, transport cases and probe protective caps.

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Mounting and Installation

The voltage tester is connected directly to the conductors to be tested. The removable test probes allow for flexible mounting. The test leads are already integrated and can be replaced if necessary. Operation is performed via buttons on the device, with functions confirmed by display and acoustic signals.

Advantages in Operation

The C.A 771 offers high safety through the combination of CAT IV 1000 V, IP65 protection rating and extended climate class S. The redundant voltage display and phantom voltage detection increase reliability. The integrated self-test minimizes error sources. The long autonomy of over 5000 measurements with 10 seconds of operation each ensures high efficiency. The removable test probes and flexible adaptation to different application scenarios increase versatility.

Scope of Delivery

The device is delivered fully assembled and ready for operation. This includes the voltage tester C.A 771, removable test probes and test leads, as well as the operating instructions. The C.A 753 socket adapter is available as an optional accessory.

Standards and Safety

The device complies with standards EN 61243-3:2010 and IEC 61010 CAT IV 1000 V. The IP65 protection rating and climate class S ensure use under harsh conditions. The functions are designed according to the requirements of the standards, including continuity testing according to Annex B of the standard.