3402.0004.24

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Fuses are one of the oldest and most reliable forms of over-current protection used in industrial, commercial, and residential applications. The primary purpose of a fuse is to protect electrical circuits from excessive currents. When a fault condition occurs, the fuse is designed to blow, preventing excessive current from flowing through the circuit.

3402.0004.24 Application Field and Working Principle

The 3402.0004.24 Fuse is a polyfuse which is engineered to deploy quickly in order to protect against inrush currents during start up. This series is suitable for applications including AC and DC power supplies and motor transformers. With a minimum operating current of 4A, this series can detect current up to 24A developing a ratio of 6A per Volt. It features a rectangular shape and is surrounded by an impact-resistant thermoplastic enclosure, complete with metal endcaps.

The 3402.0004.24 Fuse consists of a helical heating wire loop which is embedded in a flame-retardant ceramic compound. The ceramic compound is isolated from both the metal end caps and the external circuit. This circuit includes an auxiliary contact cable which closes when the fuse is activated. As current flows through the circuit, the heating wire becomes hot and expands, causing the ceramic compound to break and open the connection.

When this occurs, the fuse will blow open, cutting off the current. The open-circuit detection voltage of the fuse depends on the resistance of the heating wire loop. This resistance is directly proportional to the temperature of the wire. As the wire heats up, its resistance increases and the detection voltage of the fuse increases.

The melting temperature of the fuse is typically higher than the maximum operating temperature of the surrounding application. As such, the fuse is designed to open the circuit when the current exceeds the rated current value, preventing further damage to the circuit due to excessive current. The thermal ratings of this type of fuse are usually higher than traditional fast-acting fuses.

Aside from over-current protection, the 3402.0004.24 Fuse provides environmental protection against various factors including dust, dirt, and moisture. This advantage is obtained due to the hard plastic casing which completely seals the load from the external environment. The casing also prevents accidental breakage, making this type of fuse suitable for use in harsh and demanding environments.

The 3402.0004.24 Fuse is suitable for a wide range of applications, including power supplies, motor transformers, and any other applications requiring over-current protection. This fuse is extremely reliable and is designed to open the circuit quickly in order to protect against dangerous current levels. It is available in various configurations and is suitable for both AC and DC applications.

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