Overview
The Gould Shawmut TRS50R is a current-limiting, dual-element time-delay cartridge fuse for industrial overcurrent protection. Rated 50 amps at 600VAC / 300VDC, this RK5 class fuse is part of the industry-standard Tri-Onic family, now manufactured by Mersen (formerly Ferraz Shawmut and Gould Fuses). The TRS50R safely handles harmless motor starting and inrush currents while providing fast-clearing protection against true short-circuit faults.
Key Features
- Dual-element construction with time-delay characteristic for safe motor inrush handling
- Current-limiting design reduces arc energy and minimizes equipment damage during fault events
- 600VAC / 300VDC rating with 200kA AIC (Available Interrupting Current) at 600V
- Rejection-type cartridge body prevents improper insertion into fuse holders
- UL and CSA listed for North American industrial electrical installations
- Lot of 4 units provides backup protection stock for distributed systems and MCCs
Technical Specifications
- Current Rating: 50 Amps
- Voltage Rating: 600VAC / 300VDC
- Class: RK5 (current-limiting, fast-acting)
- Type: Time-delay (dual-element)
- Interrupt Rating: 200,000A @ 600VAC; 20,000A @ 250VDC
- Body Material: Polyester with ferrule terminals
- Dimensions: 1.06″ Dia. × 5.5″ L (26.92 × 139.7 mm)
- Weight: 5.6 oz per unit
- Certifications: UL, CSA
- Family: Tri-Onic TRS
Typical Applications
The TRS50R excels in motor circuit protection, industrial feeder and branch circuits, transformer primary protection, and service entrance equipment. The inherent time-delay characteristic safely accommodates starting currents and load inrush transients while maintaining fast response to genuine overcurrent and short-circuit events. Common installations include motor control centers (MCCs), electrical distribution panels, dedicated motor feeders, and transformer circuits rated for 50A service in industrial facilities.
Compatibility & Replacements
Compatible With
- Fuse holders rated for Class RK5 cartridge fuses
- 600VAC electrical distribution systems and motor control equipment
- Industrial control systems requiring UL/CSA-listed overcurrent protection
- Service entrance equipment and main distribution panels
- Motor control centers (MCCs) with cartridge fuse blocks
- Legacy and modern industrial electrical infrastructure
Replaces / Drop-In Replacement For
- Bussmann FRS-R 50A (functionally equivalent, RK5 class)
- Littelfuse FLSR 50A (time-delay cartridge fuse alternative)
- Other 50A RK5 class dual-element time-delay cartridge fuses in 600V applications
Works With
- 600VAC electrical distribution systems and equipment
- Motor starter circuits and soft-start installations
- Transformer feeder protection systems
- Standard North American electrical infrastructure (NEC-compliant)
- Modern and legacy industrial automation and control systems
