CM4001 AC Leakage Clamp Meter

• measurements in the frequency range 40 - 999.9 Hz
• maximum diameter of the conductor to be measured (inner diameter of the jaws) 24 mm
• extendable with Bluetooth adapter Z3210, allowing connection to a smartphone/tablet ( GENNECT Cross app)

Detailed Product Overview

The Hioki CM4001 is a compact AC leakage clamp meter for reliable current testing in confined areas such as control cabinets and distribution panels. Its slim 24 mm jaws fit easily between closely routed conductors and enable accurate measurement of leakage, differential, and load currents with True RMS accuracy.

Versatile for Leak and Load Currents

The CM4001 supports a wide range of practical applications in electrical service and maintenance. It detects leakage currents to identify insulation faults or unwanted current paths that can cause ground faults. When clamped around all active conductors, it measures differential current (residual current) to verify the operation of Residual Current Devices (RCDs) and Ground Fault Circuit Interrupters (GFCIs). These functions are essential for diagnosing nuisance tripping and intermittent earth faults. The instrument also measures load current in individual conductors, allowing quick verification of circuit load balance and early detection of abnormal current draw in connected equipment.

The instrument covers five measurement ranges from 60.00 mA to 600.0 A AC, allowing both very small leakage and high load currents to be measured with one device. Its frequency characteristics extend to 1 kHz, and the filter function suppresses high-frequency noise so that only the 50/60 Hz leakage current relevant to RCD operation is captured, even near inverters or switching power supplies.

All you need when testing fixed installations

The comparator function provides immediate pass/fail indication with a red backlight and buzzer when the preset threshold is exceeded. Additional functions include Auto Hold, Max/Min/Avg memory, Inrush current measurement (up to 150 ms), and Peak value recording, improving efficiency during inspection and troubleshooting.

Rated CAT III 300 V, the CM4001 is suitable for measurements in fixed installations, distribution panels, and electrical switchboards in residential, commercial, and industrial environments. Its compact size and measurement versatility make it an essential tool in every technician’s toolkit.

With the optional Z3210 Wireless Adapter, measurement data can be transferred via Bluetooth to the GENNECT Cross app for logging, labeling, and on-site PDF reporting. The wireless connection also allows the meter’s readings to be viewed directly on a smartphone or tablet, which is particularly useful when the instrument is positioned where the display cannot be easily seen.

Designed and manufactured in Japan

HIOKI clamp meters are developed and built at the company’s own facilities in Nagano, Japan, ensuring consistent measurement accuracy, mechanical precision, and long-term reliability.