Mersen NH3 500A gG 500V AC NH Fuse Link with Live Top Indicator, Size 3, Blade Contacts, Ceramic Body

Mersen's NH fuse link in size 3 with a 500 A rating stands apart through its gG utilization category, delivering dependable general-purpose protection for cable and line applications. Built to IEC 60269-2 and VDE 0636-2, this fuse interrupts fault currents up to 120 kA at 500 V AC, while the live top indicator provides immediate visual confirmation of a blown condition. The ceramic body and silver-plated copper blade contacts ensure stable performance and low contact resistance even under continuous load.

Highlights

• Rated current 500 A, rated voltage 500 V AC, size NH3
• Utilization category gG for general-purpose protection
• High breaking capacity of 120 kA AC
• Live top indicator for fast fault detection
• Blade contacts made of silver-plated copper
• Robust ceramic body for thermal and mechanical stability
• Complies with IEC 60269-2 and VDE 0636-2

In daily use

Installed in NH fuse switch-disconnectors or fuse bases, this fuse link protects feeders, distribution boards, and industrial equipment from overloads and short circuits. The gG characteristic allows it to handle moderate inrush currents while maintaining precise time-current behaviour. The live top indicator changes state when the fuse element melts, enabling maintenance personnel to identify the faulty circuit at a glance without voltage testing. With a power dissipation of only 58 W at rated current, heat generation remains controlled, contributing to longer service life of adjacent components.

Full specifications

• Fuse type: NH fuse link
• Fuse size: NH3 (Size 3)
• Rated current: 500 A
• Rated voltage: 500 V AC
• Utilization category: gG (general purpose)
• Breaking capacity: 120 kA AC
• Indicator type: live top indicator
• Standard compliance: IEC 60269-2, VDE 0636-2
• Power dissipation: 58 W
• Mounting type: blade contacts
• Body material: ceramic
• Contact material: silver-plated copper
• Application: cable and line protection, general industrial protection
• Voltage type: AC
• Operating temperature range: -5 °C to +40 °C (ambient)

Final note

For reliable overcurrent protection in demanding industrial environments, this Mersen NH3 fuse link combines proven gG characteristics with high breaking capacity and a clear status indicator, ensuring both safety and uptime.