FLNR125-ID - 125 Amp Fuse

FLNR125-ID - 125 Amp Fuse

Experience dependable, high‑performance circuit protection with the FLNR125‑ID 125 Amp Fuse. Built for demanding industrial and commercial power systems, this Class RK5 dual‑element time‑delay (Slo‑Blo) fuse from Littelfuse features knife‑blade terminals designed for secure, vibration‑resistant installation. With a 250 V AC / 125 V DC rating and interruption capabilities up to 300,000 A AC or 20,000 A DC, it’s engineered to handle both heavy inrush currents and catastrophic fault events. The built‑in visual blow indicator simplifies maintenance by instantly showing when a fuse has opened—minimizing downtime and cut‑over complexity. Whether you're protecting motors, transformers, control panels, or large commercial HVAC lines, the FLNR125‑ID delivers reliable protection that keeps your system running strong, even under severe stress.

This fuse is designed for systems where safety, reliability, and quick servicing matter most—and it’s optimized for industrial builds, commercial energy distribution, and mission‑critical infrastructure.

Key Features and Benefits

• Built‑in Visual Indicator: A clear blown‑fuse flag allows maintenance teams to identify open fuses instantly, cutting diagnostic time and reducing unplanned downtime.
• Time‑Delay (Slo‑Blo) Operation: The dual‑element design tolerates temporary overloads (like motor start‑up) without nuisance openings, yet still responds quickly to true short‑circuit events.
• High Interrupting Capacity: Rated up to 300,000 A AC and 20,000 A DC, this fuse handles severe fault currents without failure, providing peace of mind in high‑demand installations.
• Heavy‑Duty Knife‑Blade Terminals: Vibration‑resistant terminals allow for secure connections in industrial‑grade hardware, helping maintain consistent performance in rugged environments.
• Dual‑Element Design: Combines overload protection with short‑circuit response—offering longer equipment life and fewer false trips in demanding circuits.
• Trusted Brand Quality: From Littelfuse—an industry leader in overcurrent protection—this product meets rigorous standards and has a proven track record in mission‑critical settings.

Technical Specifications

• Catalog Number: FLNR125‑ID
• Current Rating: 125 Amps continuous
• Voltage Rating: 250 V AC / 125 V DC
• Interrupting Rating: Up to 300,000 A AC; 20,000 A DC
• Fuse Type: Time‑Delay (Slo‑Blo), Dual‑Element
• Class: RK5
• Terminal Style: Knife‑Blade (Indicating version)
• Family/Series: FLNR/FLNR_ID Indicating Fuse Line

Material Compliance and Certifications

• RoHS‑Compliant: Manufactured without restricted substances, supporting environmentally responsible installations.
• UL Listed (UL 248‑12) and CSA Certified: Conforms to North American electrical safety standards for Class RK5 fuses.
• NEC Compliance: Designed in compliance with the National Electrical Code (NEC) for appropriate use in industrial and commercial power systems.

Where It Works Best

• The FLNR125‑ID shines in applications where heavy machinery, industrial motors, large control panels, and transformer feeds are present. It’s particularly effective in motor branch circuits, HVAC systems, switchboard mains and feeders, and in any facility where frequent high‑inrush or fault‑current events occur. If you operate a manufacturing plant, commercial building, or critical infrastructure site where equipment uptime and safety cannot be compromised, this is an excellent choice for protecting your investment and maintaining system performance.