Fuse link - NH3 gG 500A/400V - time-lag 004186131

Knife fuse links – reliable installation protection

Knife fuse links NH are a proven element of electrical protection, protecting installations from the effects of short circuits and overloads. The design and parameters of these fuse links comply with PN-93/E-06160 (gF), PN-IEC-269 and VDE 0636 standards, which guarantees their reliability and safety of use.

This particular model, NH3 gG 500A/400V, is a time-delay fuse link with a rated current of 500A and a voltage of 400V. It is characterized by a gG characteristic, which means it provides full-range protection against overloads and short circuits. This is particularly important in industrial installations and public utility facilities, where high reliability of protection is required.

Design and distinguishing features

NH KOMBI fuse links, to which this model belongs, are equipped with a double tripping indicator. The combination of an indicator on the top cover and in the central part of the ceramic body provides a clear and easy-to-read indication of the fuse link blowing – both in the fuse base and in the disconnector. This design facilitates quick identification of damage and minimizes installation downtime.

Additional features affecting durability and functionality:

• Body made of steatite – a material with high thermal stability.
• Silver-plated brass knife contacts – ensure excellent electrical conductivity and corrosion resistance.
• Aluminum covers – protect against external factors.
• Filled with quartz sand – stabilizes electrical parameters and increases the short-circuit breaking capacity to 120kA.
• Possibility of cooperation with NVS 5 microswitch – enables remote signaling of fuse link operation (thanks to the indicator in the top cover).
• Silver-plated knife contacts facilitate mounting in appropriate fuse bases or disconnectors.

Application and compliance with standards

The NH3 gG 500A/400V fuse link is used to protect electrical circuits for various purposes, both in industrial installations and in public utility buildings. Its versatility results from the gG characteristic and high rated parameters.

The product meets the requirements of IEC 60269-1 and IEC 60269-2 standards, which confirms its safety and compliance with applicable standards. Additionally, it has an integral short-circuit breaking capacity of 125kA and a total Joule integral of 2556500 A²s, which demonstrates the effectiveness of the protection it provides.