JLLN125 - 125Amp Fuse

JLLN125 - 125Amp Fuse

Engineered for industrial environments where space is at a premium and fault protection can’t be compromised, the Littelfuse JLLN125 delivers high‑speed overcurrent protection in a compact form. With its 125 A rating and Class T fast‑acting response, this fuse is designed to safeguard drives, UPS systems, power distribution panels and control assemblies with confidence. The blade‑style/bolt‑in mounting makes installation simple, while the current‑limiting performance ensures downstream devices experience minimal stress during a fault. Whether you’re upgrading your panel or designing a new motor‑control cabinet, this fuse gives you dependable performance in a small footprint.

Key Features and Benefits

• 125 Amp Fast‑Acting Performance: Clears short circuits and overloads quickly to protect sensitive components.
• Space‑Saving Design: The Class T form factor is significantly smaller than many traditional size‑R fuses, freeing up panel space without sacrificing protection.
• Knife‑Blade / Bolt‑In Termination: Provides secure connection in industrial settings, helping maintain reliable continuity under tough conditions.
• Current‑Limiting Operation: Lets‑through energy is minimized during a fault, which helps reduce thermal and mechanical stress on downstream equipment—and prolongs system life.
• High Interrupting Ratings: Built to handle large fault currents — ensuring your system stays safe even when unexpected events occur.

Technical Specifications

• Ampere Rating: 125 A continuous.
• Voltage Ratings: 300 VAC and 125 VDC.
• Interrupting Ratings:
  • Up to 200,000 A at 300 VAC
  • Up to 20,000 A at 125 VDC
• Response Type: Fast‑Acting (F).
• Mounting Style: Knife‑blade/bolt‑in construction (Class T cartridge form).
• Fuse Class Designation: UL Class T.
• Typical Size: Approx. 1.062″ diameter × 2.437″ length (for the 110–200 A section of the series).

Material Compliance and Certifications

• UL Listed: UL 248‑15 standard for Class T fuses.
• CSA Certified: For Canadian safety requirements.
• CE Marked: For international installations requiring CE compliance.
• RoHS Compliant: Free from restricted hazardous substances.

Where It Works Best

• Drive Panels & Motor Controls: Ideal for variable speed drives, motor starters and other control circuits where compact, high‑speed protection is critical.
• UPS / Inverter Systems: Perfect for backup systems, power conversion setups and any scenario where protecting electronics from destructive overcurrents matters.
• Compact Switchboards & Meter Stacks: Because of its reduced size, it fits well in tight enclosures or multi‑pole protection setups where panel space is limited.
• Main & Sub‑Panels in Commercial/Industrial Environments: Provides fast‑acting protection and robust interrupt capacity when used as the main protective element in a distribution system.