Overview
The Gould Shawmut TRS20R is a Tri-Onic time-delay, current-limiting cartridge fuse engineered for critical motor and transformer circuit protection. Rated at 20A / 600V AC (300V DC), this fuse delivers UL Class RK5 performance with a 200kA AIC rating at 600V, making it ideal for demanding industrial and commercial electrical systems. The TRS20R features ferrule terminals and is constructed for both AC and DC applications with reliable, repeatable operation.
Key Features
- Current-limiting protection: Low peak let-thru current minimizes equipment damage during faults
- Time-delay / slow-blow operation: Tolerates motor inrush currents without nuisance trips
- UL Class RK5: Recognized for selective coordination and motor circuit protection
- Dual-voltage rated: 600V AC / 300V DC for flexible system integration
- Ferrule terminal construction: Secure, rejection-type design prevents insertion errors
- 200kA AIC rating: Handles high short-circuit currents safely
Technical Specifications
The TRS20R cartridge fuse meets industry standards for motor overcurrent protection and general-purpose circuit defense:
- Amperage: 20A
- Voltage Rating: 600V AC / 300V DC
- UL Classification: Class RK5
- AIC Rating: 200kA @ 600V AC; 20kA @ 300V DC
- Type: Time-Delay / Slow-Blow, Current-Limiting
- Terminal Type: Ferrule (Cartridge)
- Dimensions: 5″ L × 13/16″ Diameter
- Operating Temperature Range: −40°C to +85°C
- Application Current: AC and DC
Typical Applications
The Gould Shawmut TRS20R is widely specified for:
- Motor circuits: Primary overcurrent protection for AC / DC motors up to 20A
- Transformers: Secondary protection on transformer banks
- Service entrance equipment: Mains and feeder circuit defense
- Branch circuits: General-purpose equipment protection in industrial facilities
- Control panels: Switchboard and MCC (Motor Control Center) integration
Compatibility & Replacements
Compatible With
- Standard ferrule-type cartridge fuse holders rated 600V
- Motor control centers (MCC) and switchboards
- Service entrance and feeder protection systems
- Transformer protection schemes
- Industrial distribution panels
Replaces / Drop-In Replacement For
The TRS20R directly replaces other Tri-Onic TRS-series 20A fuses and is interchangeable with legacy Gould and Ferraz 20A Class RK5 time-delay cartridge fuses in standard ferrule holders. Always verify existing fuse specification and AIC rating match system requirements before replacement.
Works With
- UL Class RK5 ferrule-type fuse holders
- AC and DC electrical systems (600V AC / 300V DC)
- Standard industrial distribution equipment and motor starters
- Rejection-type fuse clips and mounting bases
