SIBA NH European Knife Blade Fuses: aM Motor Protection

Industrial motor circuits face extreme thermal stress during startup, requiring a protection solution that balances sensitivity with surge tolerance. The SIBA NH European Knife Blade Fuse System, specifically the Class aM variant, is engineered for partial-range protection of motor circuits, providing high breaking capacity while maintaining circuit integrity during transient inrush currents.

Product Overview

SIBA aM fuses are characterized by their "Live Metal Gripping Lugs" and "Combi-Indicator" systems. Unlike gG general-purpose fuses, the aM class is designed specifically for short-circuit protection in motor feeders, typically paired with a thermal overload relay. These fuses are rated for 690V and 1000V AC applications, conforming to international IEC and VDE standards for industrial power distribution.

Typical Applications

• Heavy Industrial Motor Feeders
• Switchgear and Controlgear Assemblies
• HVAC Chiller Protection Systems
• OEM Compressor and Pump Cabinets

Key Features & Benefits

• High Breaking Capacity: Tested up to 120kA at 690VAC to handle severe fault conditions.
• Combi-Indicator: Dual visual signaling for rapid fault identification at the front or top of the fuse.
• Live Metal Lugs: Facilitates secure extraction/insertion with standard NH handle tools.
• Partial Range protection (aM): Optimized time-current characteristics for motor startup curves.

Product Selection Guide - NH Sizes 000 to 0