Fuse link - NH00 aM 50A/690V - motor rated 004182411

Professional motor circuit protection

The NH00 fuse link with aM characteristic is a specialized solution for protecting electric motor supply circuits. It features partial-range protection, meaning it effectively protects against the effects of short circuits but requires coordination with additional overcurrent protection for full functionality.

Operating parameters and performance

The device operates at a rated voltage of 690V AC and a rated current of 50A, allowing for its application in most industrial applications. A key feature is the breaking capacity of 100kA at 690V AC, which guarantees the safe interruption of even very high short-circuit currents.

The aM characteristic (according to IEC 60269) was developed specifically for the protection of electric motors. Unlike standard gL or gG characteristics, it provides optimal protection for driving devices, taking into account the specifics of inrush currents and the requirements for protecting contactor contacts from damage in the event of a short circuit.

Construction and materials

The fuse is manufactured using industrial ceramic technology, which ensures high resistance to environmental conditions and long-term stability of electrical parameters. The NH00 size is an industrial standard, guaranteeing compatibility with a wide range of fuse bases.

The product is equipped with a dual combined indicator, which enables fast and unambiguous diagnostics of the fuse link's status—both visually and mechanically. This type of signaling significantly facilitates the operation and maintenance of the installation.

Application and operational benefits

The primary purpose is the protection of switchgear and electric motor supply circuits. The fuse link allows for the full utilization of switchgear devices regarding inrush currents, while simultaneously protecting contact elements from the destructive effects of short-circuit currents.

The product belongs to the WT-NH series from ETI POLAM—a renowned manufacturer operating since 1997, specializing in modern electrical protection solutions. The ceramic construction and precise aM characteristic make the fuse link perform reliably in demanding industrial applications where both technical parameters and long-term operational stability are crucial.