General
Enclosure diameter	20 mm

The MN38 current transformer from Chauvin Arnoux is a compact measuring device for capturing alternating currents in the range of 0.1 A to 240 A. It belongs to the MN series and is specifically designed for use in industrial and commercial installations, where precise current measurements are required at tight or hard-to-reach locations. The device features a clamping diameter of 20 mm, enabling it to securely enclose cables in confined installations. The safety categories CAT III 600 V and CAT IV 300 V ensure suitability for use in electrical systems with corresponding voltage classes, with the IEC 61010 standard applying to the device's safety.

Applications
The MN38 is suitable for precise measurements in industrial and office installations, particularly where small to medium alternating currents need to be monitored. Typical applications include maintenance, servicing, or diagnostics of electrical systems, where non-invasive current measurement is required. The compact design allows use in tight spaces where conventional measuring devices cannot fit.

Functions and Equipment in Detail
The device offers two selectable measurement ranges: 0.1 A to 24 A and 0.5 A to 240 A. This selection enables improved measurement resolution and accuracy, depending on which range is appropriate for the specific measurement task. The typical accuracy is ≤ 1 %, ensuring reliable and consistent measurements. The output is provided via 4-mm-insulated sockets, ensuring safe and reliable data transmission to external measuring devices such as multimeters or power analysers.

Technology Explained Simply
The MN38 operates as a clamp current transformer, inductively detecting current in a conductor and converting it into a proportional alternating voltage signal. The turns ratio is 1 A/100 mV for the lower range and 1 A/10 mV for the upper range. This means that 1 ampere of current produces an output signal of 100 mV or 10 mV, depending on the selected range. These signals can be directly processed by suitable measuring devices. The insulated 4-mm sockets ensure a safe electrical connection and prevent short circuits.

Compatibility and Accessories
The MN38 is designed for use with multimeters and power analysers that have appropriate inputs for alternating voltage signals. Connection is made via the 4-mm sockets, which are compatible with standard test leads.

Mounting and Installation
Installation is performed by simply clamping the cable to be measured with the clamp. No additional installation or tools are required. The clamp is placed directly onto the cable, preserving the cable insulation. Measurement is performed without interrupting the current flow.

Operational Advantages
The MN38 features an ergonomic shape and is compact, making it suitable for use in confined spaces. The two measurement ranges allow flexible adaptation to different measurement tasks, with particularly high accuracy in the lower range. The safety categories CAT III 600 V and CAT IV 300 V permit use in a wide range of electrical systems without requiring additional protective measures. The insulated output sockets increase safety when connecting to other devices.

Scope of Delivery
The scope of delivery includes the current measuring clamp MN38 and the instruction manual.