FLSR125-ID - 125Amp Fuse

FLSR125-ID - 125Amp Fuse

Get serious protection and performance with the Littelfuse FLSR125 ID fuse — a 125‑amp, 600‑volt (AC) / 300‑volt (DC) Class RK5 indicating time‑delay fuse engineered for demanding industrial and commercial electrical systems. With its dual‑element, current‑limiting design and built‑in blown‑fuse indicator, the FLSR125 ID offers outstanding circuit protection while allowing fast fault detection to minimize downtime. Whether you’re running heavy motors, branch circuits, or switchgear mains, this fuse helps keep your system safe, reliable, and efficient.

Key Features and Benefits

• Time‑delay (slo‑blow) functionality: Keeps your equipment safe from nuisance trips due to inrush currents while still protecting it from sustained overloads.
• Built‑in visual indicator: Instantly shows when a fuse has blown — dramatically reducing troubleshooting time and labor.
• Dual‑element, current‑limiting technology: Offers excellent protection against short circuits and overloads, helping extend equipment life and reduce maintenance costs.
• Knife‑blade (bladed) terminals: Provide secure, dependable connections in high‑current or critical circuits.
• Designed for industrial or commercial applications: Where performance, uptime, and safety matter most.

Technical Specifications

• Catalog Number: FLSR125 ID
• Continuous Current Rating: 125 Amps
• Maximum Voltage Rating: 600 V AC / 300 V DC
• Fuse Class: RK5 (Time‑Delay / Slo‑Blow)
• Interrupting Capacity: Up to 200 kA at 600 V AC; 20 kA at 300 V DC
• Terminal Type: Knife‑blade/bladed design
• Indicating Feature: Yes (visual blown‑fuse indication)

Material Compliance and Certifications

• UL Listed and CSA Certified: To applicable fuse standards.
• RoHS compliant: And meets modern environmental and safety requirements.
• Manufactured to Littelfuse quality standards: Ensuring consistent performance and long service life.

Where It Works Best

• This fuse is ideal for heavy‑duty applications such as industrial machinery, commercial lighting circuits, feeder mains, transformers and motor control centers. If you’re an electrical contractor, OEM, or facility maintenance manager looking for a reliable solution to protect your circuits and minimize downtime, the FLSR125 ID is built for that purpose.