Fuse link - NH3C gTr 231A/400V/160kVA - transformer type 004115404

Characteristics and application of the transformer fuse link

The NH3C gTr fuse link with a rated current of 231A is a professional solution for protecting transformers against the effects of short circuits and overloads in industrial installations. The device has been specifically designed for transformer applications where partial-range protection with gTr characteristics is required.

The product operates at a rated voltage of 400V AC and is adapted to protect transformers with a power of up to 160kVA, making it an ideal solution for medium and large power installations. The fuse link belongs to the WT-NH series from ETI POLAM - a manufacturer operating since 1997, specializing in modern electrical apparatus.

The gTr characteristic ensures optimal transformer protection by reacting selectively to various types of disturbances - from long-term overloads to high-current short circuits. Thanks to this, the device protects valuable transformer windings from thermal and electrodynamic damage.

Technical parameters and protective characteristics

The rated breaking capacity is 100kA, which guarantees effective interruption even of the largest short-circuit currents occurring in typical industrial installations. Power losses of 17W ensure energy efficiency during normal operation, minimizing additional system load.

The let-through Joule integral of 585000 A²s and the pre-arc Joule integral of 220000 A²s define the thermal energy released respectively during the interrupting process and in the phase before the electric arc inception. These parameters are crucial for assessing the device's ability to safely interrupt circuits under load.

The device complies with the VDE 0636-21 standard, confirming its compliance with European safety standards for fuse links. The NH3C size ensures compatibility with standard fuse bases of this class.

Construction and functional features

The fuse link is equipped with a combined (double) indicator, which allows for rapid identification of the device's status - both visually and mechanically. This signaling system allows for an immediate assessment of whether the fuse has operated or remains functional, significantly facilitating installation operation and maintenance.

The NH-type construction ensures high operational reliability and ease of replacement in the event of operation. The product weighs 585g, which, combined with its compact dimensions (54×150×84 mm), facilitates installation in industrial switchboards.

The availability of EAN codes (5904722988880) enables easy product tracking in warehouse systems, and a wide range of packaging (from single units to pallets containing 624 units) adapts to various logistical needs - from small workshops to large industrial investments.