Overview
The Cooper Bussmann LPS-RK-5SP is a Low-Peak series Class RK1 time-delay fuse designed for industrial and commercial circuit protection. Each fuse is rated at 5 amperes and 600VAC (300VDC), with a 300 kAIC interrupting rating at 600V. The dual-element, current-limiting design allows momentary inrush currents (typical in motor and transformer circuits) while reliably interrupting sustained overcurrents. This lot contains 5 individual units.
Key Features
- Time-Delay, Dual-Element Design: Tolerates temporary inrush without nuisance tripping; responds quickly to true faults
- Current-Limiting: Reduces let-through energy and minimizes equipment damage in high-fault-current environments
- Class RK1 Rating: Approved for use in Class RK1 fuseholders; interchangeable within RK1 footprint
- Non-Indicating: Ferrule-end construction; visual inspection required to confirm operation
- High Interrupting Capacity: 300 kAIC at 600Vac; 100 kAIC at 300Vdc
- Compact Form Factor: 0.81" diameter × 5" length; fits standard fuse clips and blocks
Technical Specifications
- Rated Current: 5 Amperes
- Voltage (AC): 600VAC
- Voltage (DC): 300VDC
- Interrupting Rating (AC): 300 kAIC @ 600Vac
- Interrupting Rating (DC): 100 kAIC @ 300Vdc
- Fuse Class: RK1
- Type: Time-Delay, Dual-Element, Current-Limiting
- Terminal Style: Ferrule End × Ferrule End
- Diameter: 0.81 inches
- Length: 5 inches
- Time-Delay Response: Approximately 10 seconds at 500% rated load
- Quantity: 5 fuses per lot
- Approvals: UL, CSA C22.2, CE
Typical Applications
- Feeder and branch circuit protection
- Motor branch circuits
- Transformer primaries
- Solenoid and coil protection
- General-purpose industrial electrical systems
- Control panel and equipment circuits where momentary inrush is expected
Compatibility & Replacements
Compatible With
- Class RK1 fuseholders and clips (standard 600V industrial fuse blocks)
- Control panels and distribution equipment rated 600VAC
- Motor control centers and starter assemblies
- Power distribution systems with RK1-compliant fuse blocks
Replaces / Drop-In Replacement For
- Eaton Bussmann LPS-RK-5SP (identical part under Eaton ownership)
- Legacy Cooper Bussmann LPS-RK-5 (non-SP variant; verify interchangeability with your equipment)
- Other Class RK1 5A dual-element fuses rated 600V (confirm identical footprint and time-delay curve)
Works With
- Class RK1 fuse-based protection schemes
- Standard 600VAC industrial electrical systems
- Motor starter and transformer protection circuits
- Any application designed for 5A RK1-rated fuses
