Eigenschaften
Clamping diameter from	20 mm
Dimensions	135 x 51 x 30 mm
Weight	290 g
Measurement cable length	3,5 m

The AC current clamp MN93A from Chauvin Arnoux is a compact measuring accessory for precise measurement of small alternating currents. It features two measurement ranges and is specifically designed for use with power analysers from the Qualistar series as well as with PEL measuring instruments. The clamp enables measurement of secondary currents from current transformers and small AC currents in electrical installations. Its clamping diameter of 20 mm makes it suitable for conductors with small cross-sections, while the compact design and ergonomic shape ensure safe handling.

Applications

The clamp is used in industrial electrical engineering and the energy sector, where precise measurement of low alternating currents is required. It is particularly useful for diagnosing current transformers, monitoring consumers with low current consumption, or analysing power quality. The application is carried out in conjunction with suitable measuring instruments that receive the current values via the integrated cable. The measurement ranges depend on the connected device: when connected to PEL 51/52 or C.A 8331/8333/8336/8436, the range is 0.005 A to 5 A AC and 0.1 A to 100 A AC. When connected to C.A 8332B/8334B/8335/8435, the upper range extends to 120 A AC, and with C.A 8220/8230, it reaches 120 A AC (lower range 0.3 A). The clamp is thus flexibly usable, depending on the measuring instrument family used.

Functions and equipment in detail

The clamp operates in the frequency range of 48 Hz to 65 Hz, matching typical mains frequencies. The measurement cable has a length of 3.5 m, providing sufficient reach for typical applications. The current clamp is designed as a clamp current transformer, which detects the magnetic flux around the conductor and converts it into an electrical signal processed by the connected measuring instrument. The two measurement ranges (5 A and 100 A) allow high resolution for small currents and sufficient measurement capacity for higher loads.

Technology explained simply

The clamp uses the principles of inductive current measurement. When the conductor is passed through the clamp, the flowing current generates a magnetic field, which is detected by the clamp and converted into a proportional electrical signal. This signal is transmitted via the 3.5-m cable to the connected measuring instrument. The safety categories CAT III 600 V and CAT IV 300 V in accordance with IEC 61010 ensure that the clamp is suitable for measurements in electrical installations with the corresponding voltage class. This includes typical applications in industry and the energy supply sector. The clamp is therefore designed for use in environments with increased electrical risk.

Compatibility and accessories

The clamp is designed for use with various power analysers from Chauvin Arnoux, including the Qualistar series, the PEL series (PEL 51/52, PEL 10X/11X), as well as models such as C.A 8220, 8230, 8331, 8332B, 8333, 8334B, 8335, 8336, 8345, 8435 and 8436. The exact measurement ranges vary depending on the device, but in all cases the clamp enables measurement from 0.005 A to 5 A AC and 0.1 A to 100 A AC (or up to 120 A AC with certain models). The clamp is not a standalone measuring instrument, but an add-on module connected to an existing measuring system.

Installation and mounting

Installation is carried out by simply opening the clamp, inserting the conductor to be measured, and closing the clamp. Connection to the measuring instrument is made via the 3.5-m cable. The clamp requires no additional mounting or tools. The user manual, included in the delivery, describes the correct handling and connection to compatible devices.

Operational advantages

The clamp offers high measurement accuracy for small currents, which is crucial for diagnosing current transformers and analysing consumers with low current consumption. The compact design and ergonomic handle facilitate handling, especially in confined spaces. The two measurement ranges allow flexible adaptation to different measurement tasks. The safety approval CAT III 600 V / CAT IV 300 V ensures safe operation in industrial and energy technology installations. The clamp is designed for use in industrial electrical engineering and the energy sector, where reliability and safety are paramount.

Delivery contents

The delivery includes the clamp current transformer MN93A and the user manual. The clamp is delivered without additional components such as batteries, adapters or tools. The user manual contains information on correct use and connection to compatible measuring instruments.