Overview
The Gould Shawmut TR125R is an industry-standard Class RK5 time-delay fuse engineered for overcurrent protection in motor circuits, transformers, service entrance equipment, and feeder/branch circuits. The Tri-Onic TR series combines time-delay characteristics with current-limiting technology to safely handle harmless starting and inrush currents typical in modern motors and transformer applications while providing reliable protection against overcurrent conditions.
Key Features
- Time-Delay Characteristics: Dual-element construction safely passes temporary inrush and starting currents without nuisance fusing
- Current-Limiting Technology: Reduces energy and damage during fault conditions
- Class RK5 Certified: UL-recognized for use in motor circuits and general-purpose industrial applications
- Blade Terminal Design: Standard knife-blade cartridge mounting for quick insertion and removal
- High Interrupting Rating: 200kA AC / 20kA DC for reliable fault interruption
- Industrial-Grade Construction: Metal-embossed date and catalog number for traceability and lasting identification
Technical Specifications
- Amperage Rating: 125A
- Voltage Rating: 250V AC/DC
- Class: RK5
- Series: Tri-Onic TR
- Type: Time-Delay (Dual-Element)
- Interrupting Capacity: 200kA AC / 20kA DC
- Length: 7 1/8 inches
- Diameter: 1 9/16 inches
- Terminal Style: Blade (Knife-Blade Cartridge)
- Material: Copper element with fiberglass body
Typical Applications
- Motor circuit protection in industrial machinery and HVAC systems
- Transformer overcurrent protection for power distribution
- Service entrance and main disconnect protection
- Feeder and branch circuit protection
- Commercial and industrial power distribution equipment
- General-purpose equipment requiring dual-element time-delay fuse protection
Compatibility & Replacements
Compatible With
- Standard fuse blocks accepting Class RK5 blade cartridges (250V applications)
- Motor disconnect switches with 250V fuse holders
- Industrial service entrance equipment rated 250V
- Transformer protection enclosures for 250V circuits
- General-purpose industrial electrical panels and switchboards
Replaces / Drop-In Replacement For
- Ferraz Shawmut TR125R (current manufacturer designation)
- Mersen TR125R (successor brand)
- Gould TR-R 125A 250V fuses
Works With
- Class RK5-certified fuse blocks and holders
- 250V single-phase and three-phase power distribution systems
- Motor protection relays and overload devices
- Standard industrial electrical control systems
