Cylindrical fuse insert CH-10 10x38mm gG 0.5A 500VAC LF300G

Protection of Low-Current Circuits in Industrial and Domestic Installations

The 10x38 mm cylindrical fuse cartridge is a key component for ensuring the safety of electrical installations requiring precise protection against overloads and short circuits. The device, designated as model LF300G, features a rated current of 0.5 A and is designed for operation in alternating current (AC) networks with a voltage up to 500 V. Thanks to the use of a gG (general-purpose) tripping characteristic, this element provides universal protection for both supply cables and load devices. It is a dedicated solution for applications where rapid power disconnection is required in the event of a fault, while maintaining resistance to short-term current surges occurring during normal installation operation.

Ceramic Construction and High Breaking Capacity

The fuse cartridge construction is based on a ceramic body, ensuring resistance to high temperatures generated during fuse operation. This material prevents casing cracking even under very high short-circuit currents. A key parameter for the installer is the short-circuit breaking capacity (Icn), which in this model reaches 120 kA. This means the fuse can safely interrupt the circuit even under extremely high short-circuit currents without sustaining damage or causing fire or explosion hazards in the distribution board.

Device operation involves specific energy losses. At the rated current of 0.5 A, the cartridge dissipates power at a level of 1.43 W. This value is significant when designing systems with high mounting density or in enclosed housings where excess heat may affect other system components. Nevertheless, for standard industrial applications and building installations, this parameter complies with norms for this type of component.

Application and Mounting Compatibility

The standard 10x38 mm dimensional format ensures that this product is fully compatible with most popular fuse holders used in low-voltage distribution boards and fuse disconnectors. No modification of existing infrastructure is required – simply replace the worn-out element with the new LF300G model (or equivalent) to restore full circuit protection functionality.

Main application areas include:

• Protection of low-current control and signaling circuits.
• Protection of control transformers and contactor coils.
• Photovoltaic installations (often requiring protection with low current ratings).
• Power supply systems for electronic devices requiring precise disconnection in case of overload.

Thanks to the gG characteristic, the cartridge acts as a general-purpose protection device – it protects cables from overheating and devices from damage resulting from prolonged overload or short circuits. This is a time-tested solution meeting the requirements of IEC 60269 standards for cylindrical fuses. In practice, this means simple installation for the electrician and reliable operation for the end user – without the need for complex monitoring systems or additional secondary protection in typical 50/60 Hz applications.