pv Magazine - New F404T Multifunction Clamp Meter

Read the article online

Opening a photovoltaic circuit under DC voltage can cause a dangerous electric arc. It is therefore essential to reliably verify that the circuit is de-energized before performing any work. However, conventional current clamps may falsely indicate that the circuit is de-energized in the event of a malfunction or incorrect configuration.

The new F404T versatile current clamp for photovoltaic systems therefore features a patented self-test: with the simple press of a button, it generates a reference current and verifies its operation and configuration before each measurement.

The F404T complies with CAT III 1,500 V and CAT IV 1,000 V standards, has an IP54 protection rating, measures up to 1,000 A AC or 1,500 A DC, automatically detects AC or DC current, and offers voltage, resistance, continuity, and temperature measurement functions.

1. Strong growth in the photovoltaic sector: new safety challenges for qualified electricians.
2. Unlike traditional systems, solar installations generate energy continuously and are constantly energized.
3. Maintenance work—particularly opening circuits under load—exposes professionals to increased risk.

A Major Challenge: Ensuring the Absence of Current

In photovoltaic systems, the lockout/tagout (LOTO) procedure relies on verifying the absence of current rather than the absence of voltage.

However, a conventional current clamp may falsely indicate that no current is flowing if it is improperly configured or defective, posing a critical risk to the operator.

A Patented Innovation for More Reliable Measurements

The F404T multifunction photovoltaic current clamp offers a unique solution thanks to its integrated, patented self-test.

With the simple press of a button, the device generates a reference current that allows users to immediately verify its proper operation and configuration, and to confirm the reliability of the measurement before any work is performed.

A tool designed for modern solar installations

The F404T is suitable for the latest generations of photovoltaic installations and features a safety rating of 1,500 V CAT III / 1,000 V CAT IV, combined with an IP54 protection rating. It can measure currents up to 1,000 A AC or 1,500 A DC.

In addition to the ease of use offered by its self-test function, the current clamp automatically detects whether the current is AC or DC, saving time and reducing the risk of error.

A 2-in-1 measuring device

The F404T is much more than just a safety tool: it is a fully-fledged multifunction clamp meter that integrates measurements of current, voltage, resistance, continuity, and temperature.

It also features advanced analysis and diagnostic functions: the Min/Max function, the differential measurement function ΔREL, and the relative measurement function ΔREL/R, as well as the “True Inrush” function, which detects overcurrent conditions caused by undersized electrical conductors or false tripping of thermal protection devices.