Cylindrical fuse insert CH-14 14x51mm gG 20A 500VAC LF420G

Protection of Circuits with High Inrush Currents

14x51 mm fuse cartridges are a standard in industrial installations and low-voltage switchgear, where reliability is crucial alongside a compact design. The LF420G model, manufactured by Hager, is designed for operation in alternating current (AC) circuits with a rated voltage up to 690 V. Its primary function is protection against overloads and short circuits, making it a universal component in power distribution systems. Thanks to its gG (general-purpose) tripping characteristic, this cartridge effectively protects not only cables but also devices connected to the network, responding to prolonged overloads and providing instantaneous response during short circuits.

Key Parameters and Practical Application

The rated current of 20 A defines the maximum continuous current flow that the cartridge can carry without tripping. This is a critical value for installers selecting protection for specific loads. It is important to note the high short-circuit breaking capacity of 80 kA. This means the fuse can safely interrupt a short-circuit current of this magnitude without the risk of explosion or housing damage – a feature essential in locations with high short-circuit power, such as main building switchboards or industrial plants.

Power loss at rated current is only 2.5 W. This low value translates to reduced heating of the component under normal operating conditions, increasing the safety of the entire installation and reducing energy losses. The ceramic construction ensures thermal and mechanical resistance, while the cylindrical shape facilitates mounting in standard CH-14 type fuse holders.

Compliance with Standards and Operating Conditions

The product meets the requirements of the IEC 60269 standard, guaranteeing its compatibility with widely used protection systems in Europe. The cartridge is suitable for installation in low-voltage switchgear where protection against the effects of reverse short circuits and prolonged overloads is required. The high breaking capacity combined with a precise time-current characteristic makes it a reliable element for supply cables and electrical equipment. To facilitate logistics for larger renovation investments or new industrial installations, these components are supplied in bulk packaging, typically containing 10 pieces.