Introduction
The NT-M series fuse links are high-performance, knife-type fuse links designed for industrial automation and motor circuit protection. They cover sizes NT00, NT1, and NT3 and are rated for AC 800V, meeting IEC 60269 standards. As gM (motor) series fuses with full-range (gG) characteristics, NT-M links provide reliable overload protection and short-circuit protection in low-voltage panels and switchgear. Constructed with a robust ceramic fuse body and blade-shaped contacts, these knife fuses form a compact NH fuse link assembly that plugs into standard fuse holders and fuse bases in industrial cabinets.
This NH-compatible, DIN-standard design enables NT-M fuses to replace legacy NH00/NH1/NH2 blade fuses, providing a modern, low-voltage, high-performance fuse solution for global markets.
Structure and Features
Compact ceramic fuse link with knife blade contacts. The NT-M fuse link consists of a square ceramic body and plated copper alloy knife blade contacts. Inside, a high-purity silver/copper fuse element is precisely calibrated for current interruption.
The entire assembly is a low-voltage fuse link that mates with NH00–NH3 cartridge fuse holders. Key features include built-in pre-arc extinguishing, minimizing energy during faults, robust insulation, and a fuse breaking capacity rated to meet demanding industrial safety requirements. The NT-M design supports both fixed mounting and fuse switch-disconnectors, making it suitable for panelboards, busbar systems, and energy system applications.
Advantages
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Full-Range Protection: gG-rated fuse link provides both overload and short-circuit protection in one device.
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High Interrupting Capacity: Up to 100 kA breaking capacity handles high fault currents without damage.
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Global Standards Compliance: Conforms to IEC 60269-2 and DIN 43620, ensuring worldwide interoperability (NH fuse IEC 60269-2).
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Premium Materials: Ceramic fuse body and silver-plated copper melt elements yield fast response and low power dissipation.
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Easy NH Replacement: Fits existing NH fuse holders and bases (NH fuse cartridge form), simplifying NH fuse replacement in switchgear and panel fuse blocks.
NT-M links are certified for industrial safety (RoHS, CE) and have been rigorously tested for voltage, temperature rise, and breaking performance. This ensures reliable AC fuse protection in global automation systems, while reducing maintenance downtime.
FAQs
What does “M” indicate in the NT-M fuse series?
“M” denotes a motor-protection gM type fuse, meaning the internal structure is optimized for motor circuits. It behaves like a gG fuse but withstands motor surge loads.
What are the voltage and current ratings?
NT-M fuse links are rated up to 800VAC. Available currents span 2A to 315A across NT00, NT1, and NT3 sizes. Smaller links (NT00) interrupt up to ~30kA, while larger (NT3) links are rated ~100kA.
What standards and features does it meet?
These fuse links comply with IEC 60269-2 and Chinese GB/T 13539. They offer gG full-range protection with high breaking capacity and pre-arcing I²t control.
Is NT-M compatible with standard NH fuse holders?
Yes. NT-M fuses are dimensionally compatible with NH fuse holders and fuse bases. They can replace older NH fuse links without modifying the panel hardware.
What is the difference between the NT-M and NT-P series?
The NT-P series is rated for higher voltage (1140VAC) and typically supports larger amp ranges. NT-M is rated to 800VAC, whereas NT-P is rated to 1140VAC. Both share similar knife-blade construction.
