Overview
The Gould Shawmut TRS50R is a Tri-Onic dual-element, time-delay cartridge fuse designed for industrial motor and transformer circuit protection. Produced by Mersen (formerly Ferraz Shawmut and Gould Fuses), this fuse stands as an industry-leading solution for motor circuit protection. Rated for 50 amps at 600 volts with a UL Class RK5 designation and 200kA AIC rating, the TRS50R delivers current-limiting, time-delay characteristics ideal for general plant electrical systems.
Key Features
- Dual-Element Time-Delay Design: The time-delay characteristics safely handle harmless starting currents and inrush currents associated with motors and transformers.
- Current-Limiting Protection: Engineered with advanced material technology for effective overcurrent protection of motors, transformers, service entrance equipment, feeder circuits, and branch circuits.
- UL Class RK5 Rated: Meets industrial standards for power distribution and motor protection applications.
- Non-Indicating, Rejection-Type: Ferrule terminal cartridge style for standard fuse holders marked “K”.
- Lot of 4 Units: Convenient bulk purchase for maintenance stock or equipment protection needs.
Technical Specifications
- Ampere Rating: 50A
- Voltage Rating: 600VAC / 300VDC
- Class: RK5
- Interrupt Rating: 200kA @ 600V
- Speed: Time Delay (Dual Element)
- Body Material: Fiberglass
- Body Style: Cartridge (Cylindrical)
- Diameter: 1-1/16 inch (26.92mm)
- Length: 5-1/2 inch (139.7mm)
- Weight: 5.6 oz per unit
- Terminal Type: Ferrule
- Fuse Holder Code: K
- Standards: UL, CSA
Typical Applications
Ideal for motor circuits, mains, feeders, branch circuits, transformers, service entrance equipment, and general-purpose equipment. The TRS50R is commonly used in:
- Motor control centers and starter circuits
- Industrial machinery and equipment branch protection
- Transformer primary circuits
- Feeder and service entrance circuits in manufacturing facilities
- Backup stock for preventive maintenance programs
Compatibility & Replacements
Compatible With
- Standard RK5-rated fuse holders (Code K)
- 600V distribution systems and control circuits
- Motor starter circuits and control panels
- Industrial power distribution equipment
- Equipment designed for 50A circuit protection
Replaces / Drop-In Replacement For
- Bussmann FRS-R series (FRS-R-50 equivalent)
- Littelfuse FLSR series (FLSR-50 equivalent)
- Ferraz Shawmut TR50R (previous designation)
Works With
- Any UL Class RK5 fuse holder rated for 50A or higher
- Motor control centers (MCCs) with standard cartridge fuse clips
- Industrial control systems requiring dual-element time-delay fuses
- Electrical equipment built to UL, CSA, and IEC standards
