Cylindrical fuse insert CH-14 14x51mm gG 25A 500VAC LF425G

Protection of Medium-Current Industrial Circuits

The 14x51 mm cylindrical fuse link is a key component in installations requiring reliable protection against overloads and short circuits. This model, designed for operation in alternating current (AC) networks with voltages up to 690 V, features a rated current of 25 A. Thanks to its gG (general-purpose) time-current characteristic, the device effectively protects both conductors and connected loads, responding to prolonged overloads as well as instantaneous short circuits. It is a typical solution for circuits powering industrial machinery, main distribution boards, or control systems, where stability and safety are priorities.

Ceramic Construction and Operational Parameters

The unit is constructed from ceramic, ensuring resistance to high temperatures generated during operation and durability in harsh environmental conditions. Its internal design allows for safe circuit interruption at short-circuit currents up to 80 kA (in accordance with IEC 60898-1), a value sufficient for most industrial and commercial applications. Note the power losses – at rated current, they amount to approximately 3.3 W. This means that during normal operation, the fuse link does not generate excessive heat, resulting in reduced thermal stress on adjacent components within the distribution board.

With dimensions of 14x51 mm and a rated current of 25 A, this component fits perfectly into standard industrial distribution boards. The rated voltage of up to 690 V AC enables its use in systems with higher operating voltages, while the gG characteristic ensures application versatility – from protecting supply cables to safeguarding auxiliary equipment. The high breaking capacity of up to 80 kA eliminates the risk of installation damage even under very strong short circuits, which is crucial for the safety of the entire electrical network.

Application and Installation in Electrical Systems

Installation of this fuse link requires the use of appropriate fuse holders dedicated to the 14x51 mm size. Due to its gG characteristic, the component is universal – suitable for protecting supply cables and devices that do not require specific tripping curves (such as motors with high inrush currents, where aM characteristics are sometimes used). In practice, this means the fuse link is ideal where standard protection against installation damage due to short circuits or overloads is required. Its compact design facilitates installation in distribution boards with limited space, while the high breaking capacity ensures safety even during high-energy fault events.