Mersen 1B639.000000 NH000 25A gG 500V NH Fuse Link, Live Working Safe, 120kA Breaking Capacity

With a breaking capacity of 120 kA at 500 V AC, this Mersen NH000 fuse link delivers exceptional short-circuit protection for industrial low-voltage distribution systems. The 25 A gG operating class ensures reliable protection of cables and lines against overload and short-circuit currents, while the live working safe (sf) design allows for safe installation and removal under voltage using appropriate tools.

Overview

The Mersen 1B639.000000 is a high-performance NH fuse link in size 000, rated 25 A and 500 V AC. It belongs to the gG (general purpose) operating class, suitable for full-range protection of cables and conductors. The fuse features a compact ceramic body with silver-plated copper contacts, ensuring low power dissipation and long service life. The live working safe (spannungsführend) designation indicates that the fuse can be safely handled while the circuit is energized, provided proper insulated tools and personal protective equipment are used.

What stands out

• High breaking capacity of 120 kA for robust short-circuit protection
• Live working safe design for safe replacement under voltage
• Compact NH000 size fits standard fuse bases and switch-disconnectors
• Low power dissipation reduces energy losses and heat generation
• Reliable gG protection for cables and lines in industrial networks

Technical details

• Rated current: 25 A
• Rated voltage: 500 V AC
• Operating class: gG (general purpose)
• Size: NH000
• Breaking capacity: 120 kA
• Live working safe: Yes (spannungsführend)
• Contact material: Silver-plated copper
• Body material: Ceramic

Our verdict

The Mersen 1B639.000000 NH fuse link is a top-tier choice for industrial low-voltage protection. Its 120 kA breaking capacity and live working safe design provide both safety and performance, making it ideal for demanding applications where downtime must be minimized.