Fuse link - NH4a gG 630A/690V - time-delay 004176105

Reliable installation protection with NH4a fuse link

The NH4a gG 630A/690V fuse link is an element used to protect electrical installations from the effects of overloads and short circuits. Designed with industrial requirements in mind, it provides effective protection and reliable operation. It is a proven component, compliant with applicable standards, ideal for both professional installers and end-users looking for solid protection.

Characteristics and application

The NH4a gG 630A/690V knife fuse link is characterized by a rated current of 630A and a rated voltage of AC 690V. The gG class means that it is a general-purpose fuse link, providing full-range protection of conductors against overloads and short circuits. Its construction based on high-quality materials guarantees stability of electrical parameters and long-term operation. The operating indicator located on the top cover facilitates quick identification of a blown fuse.

Construction and benefits

The fuse link is made of durable steatite, which ensures thermal stability. The knife contacts made of silver-plated brass minimize transition resistance and ensure a secure connection. Aluminum covers protect against corrosion, and the filling of the housing with quartz sand of a special granulation increases the short-circuit switching capacity to 120kA. Thanks to this, the fuse link offers:

• Effective protection: Protects the installation from damage caused by overloads and short circuits.
• High reliability: Solid construction and high-quality materials guarantee long-term operation.
• Easy status identification: The operating indicator on the top cover allows for quick recognition of a blown fuse.
• Compliance with standards: Meets the requirements of IEC 60269-1 and IEC 60269-2 standards, ensuring safe use.
• Remote signaling capability: Cooperation with the NVS 5 microswitch enables remote signaling of the fuse link operation (requires additional accessories).

It is important to remember to choose the appropriate fuse base or fuse disconnect switch, adapted to the size of NH4a and the specifics of the installation. For NH4 fuse links, special knife contact designs are dedicated to ensure proper contact with the jaw clamps of the fuse base. When used in HVL or KVL fuse disconnect switches, it is recommended to use fuse links with a striker (NH.../K…) equipped with microswitches for remote signaling of fuse link operation.