Mersen 1B155.000000 NH1 63A gG 500V NH Fuse Link, Live Grip Lugs, Dual Indicator, 120kA Breaking Capacity

With a breaking capacity of 120 kA at 500 V AC, this Mersen NH1 fuse link delivers exceptional short-circuit protection for industrial power distribution. Rated at 63 A and built to IEC 60269-2 and VDE 0636-2, it ensures reliable operation in switchgear, distribution boards, and motor control centers. The dual indicator—visible from both top and side—provides clear blown-fuse status at a glance, while the live grip lugs allow safe installation and removal under load using standard fuse pullers.

Overview

The Mersen 1B155.000000 is a general-purpose (gG) NH fuse link in size NH1, engineered for full-range breaking capability. It protects cables, conductors, and equipment from overloads and short circuits in low-voltage AC networks up to 500 V. The ceramic body and silver-plated copper contacts ensure high thermal stability, low contact resistance, and long service life even under frequent load cycling.

What stands out

• High breaking capacity: 120 kA at 500 V AC for robust fault interruption.
• Dual indicator (top and side) for easy fuse status monitoring from multiple angles.
• Live grip lugs (spannungsführend) enable safe replacement with insulated tools while the circuit is energized.
• Compact NH1 size fits standard fuse bases and switch-disconnectors, saving panel space.
• Compliant with IEC 60269-2 and VDE 0636-2, ensuring global acceptance and safety.

Technical details

• Rated current (In): 63 A
• Rated voltage (Un): 500 V AC
• Utilization category: gG (general purpose, full-range breaking)
• Fuse size: NH1
• Breaking capacity: 120 kA at 500 V AC
• Standards: IEC 60269-2, VDE 0636-2
• Operating frequency: 50/60 Hz
• Mounting type: Blade contact (live grip lugs)
• Indicator type: Dual indicator (top and side)
• Rated power dissipation: 7.5 W at In
• Body material: Ceramic
• Contact material: Silver-plated copper
• Voltage type: AC
• Operating temperature range: -5°C to +40°C
• Construction: Enclosed, non-rewirable
• Fuse type: High Rupturing Capacity (HRC)

Our verdict

For industrial electricians and panel builders, the Mersen 1B155.000000 offers a perfect balance of performance, safety, and compliance. Its high breaking capacity and live grip lugs make it a dependable choice for demanding low-voltage distribution systems.