Overview
Bussmann LPN-RK-20SP is a Class RK1 low-peak dual-element time-delay fuse engineered for demanding industrial and commercial electrical circuits. Manufactured by Eaton Bussmann, this 20A fuse at 250V features current-limiting technology with a 300 kA interrupting rating at 250 Vac and 100 kA at 125 Vdc, delivering proven protection against both overloads and short circuits while minimizing peak let-through current.
Key Features
- Dual-Element Design: Separate overload and short-circuit elements provide coordinated, time-delayed response for motor and transformer circuits
- Low-Peak Technology: Current-limiting construction reduces peak fault current, protecting downstream equipment from damage
- Class RK1 Rating: UL/CSA-certified Class RK1 fuse meets stringent coordination requirements with motor starters and branch circuit breakers
- Non-Indicating Type: Cartridge design fits standard RK-class fuse holders without requiring additional hardware
- High Interrupt Capacity: 300 kA rating handles fault conditions safely in industrial panel installations
- Lot of 8 Units: Cost-effective bulk package reduces per-unit cost for maintenance stocks and panel builds
Technical Specifications
The LPN-RK-20SP meets or exceeds industry standards for reliability and performance across a range of electrical environments.
Typical Applications
The Bussmann LPN-RK-20SP is suitable for:
- Motor feeder and branch circuit protection
- Transformer primary and secondary protection
- Solenoid and control circuit fusing
- General-purpose distribution panel fusing
- Industrial machinery and process control circuits
Compatibility & Replacements
Compatible With
- Standard RK-class cartridge fuse holders (RK1 rated)
- Industrial control panels and electrical enclosures rated for 250V, 20A circuits
- Motor starter and soft-starter assemblies with RK-class fusing
- Distribution boards and switchgear with Class RK1 protection requirements
- UL/CSA-certified electrical systems (North American installations)
Replaces / Drop-In Replacement For
- Cooper Bussmann LPN-RK-20SP (older manufacturer designation)
- Eaton LPN-RK-20SP (current parent company)
Works With
- RK-class fuse holders and fuse blocks
- Electrical safety standards: UL 248-1 (General Requirements) and UL 248-14 (Class RK1 Fuses)
- IEC coordination with electromechanical and electronic motor starters
- NFPA 70 (National Electrical Code) compliant installations
