Overview
The Bussmann LPS-RK-30 is a Class RK1 dual-element, time-delay current-limiting fuse rated for 30A at 600VAC (300VDC). This three-pack of Low-Peak fuses provides fast short-circuit protection while tolerating normal motor inrush currents, making them essential for reliable circuit protection in industrial automation, power distribution, and equipment control systems.
Key Features
- Dual-Element, Time-Delay Design: Permits sizing as close as 130% of motor full load amps for selective coordination without nuisance trips
- High Interrupting Rating: 300 kA at 600VAC / 100 kA at 300VDC for dependable protection against severe faults
- Current-Limiting Protection: Protects downstream components from thermal and magnetic stress during short circuits
- Class RK1 Construction: Industry-standard UL and CSA certified cartridge fuse with 2:1 ampacity ratios for easy selective coordination
- Proven Low-Peak Performance: Reduces fuse inventory by up to 33% when replacing older H, K, or RK5 classes
Technical Specifications
- Voltage Rating: 600VAC / 300VDC
- Current Rating: 30A
- Fuse Class: RK1
- Type: Dual-element, time-delay
- Interrupting Rating: 300 kA @ 600VAC; 100 kA @ 300VDC
- Time Delay: 10 seconds at 500% overload
- Body Style: Cylindrical ferrule cartridge
- Dimensions: 0.815" Dia × 5.004" Long (20.6mm × 127mm)
- Weight: ~2.24 oz per fuse
- Certifications: UL, CSA, CE
- Manufacturer: Eaton Bussmann
- Standard Package: Lot of 3 fuses
Typical Applications
- Feeder and branch circuits in industrial control panels
- Motor starter protection and backup overload defense
- Transformer primary and secondary circuit protection
- Solenoid and contactor branch protection
- General-purpose industrial power distribution
- OEM equipment where selective coordination is required
Compatibility & Replacements
Compatible With
- Standard North American fused disconnect switches (Class RK1 compatible)
- Motor control centers (MCCs) with RK1 fuse holders
- Industrial panel boards and load centers rated for RK1 fuses
- Power distribution equipment utilizing 600V three-phase systems
- Backup overload protection for DOL and soft-starter motor circuits
Replaces / Drop-In Replacement For
- LPS-RK-30 (non-indicating variants)
- LPS-RK-30SP (current Eaton Bussmann designation)
- Older Bussmann class H, K, and RK5 fuses at 30A 600V ratings where RK1 compatibility is available
- Cooper Bussmann LPS-RK-30 legacy part numbers
Works With
- Class RK1 fuse holders and clips
- Standard North American electrical distribution systems
- Both AC and DC circuits (600VAC primary, 300VDC secondary)
- Selective coordination schemes using 2:1 ampacity spacing
- Standard IEC and UL-listed control equipment
