Overview
The Bussmann LPN-RK-30SP is an industrial-grade, Class RK1 dual-element time-delay fuse designed for reliable overcurrent protection in electrical systems. Rated at 30A and 250V AC/DC, this current-limiting fuse provides selective coordination and fast short-circuit protection while allowing brief inrush currents typical in motor and transformer circuits. The LPN-RK-30SP features rejection properties that prevent installation of incompatible fuse types, ensuring proper system protection and personnel safety.
Key Features
- Dual-element, time-delay design: Responds to sustained overloads within 8 seconds at 500% of rated current while withstanding momentary inrush; ideal for inductive loads.
- Current-limiting technology: Limits fault current and reduces stress on downstream equipment during short circuits.
- Class RK1 rating: Standard industrial rejection fuse with simple 2:1 selective coordination ratio across the Low-Peak series.
- 300 kA interrupting rating: Supports safe interruption of high-fault-current systems up to 300 kA at 250V AC.
- UL, CSA, and CE certified: Meets North American and European safety standards for industrial and commercial use.
- Non-indicating cartridge: Standard ferrule-terminal cylindrical design; fits standard RK-class fuse holders.
Technical Specifications
- Amperage: 30A
- Voltage: 250V AC / 125V DC
- Class: RK1
- Speed: Time-delay (slow-blow)
- Type: Dual-element, current-limiting
- Interrupting Rating: 300 kA @ 250V AC; 100 kA @ 125V DC
- Body Diameter: 0.56 inches (14.22 mm)
- Body Length: 2.0 inches (50.8 mm)
- Weight: 0.64 oz
- Termination: Ferrule terminal
- Certifications: UL, CSA, CE
Typical Applications
Bussmann Low-Peak LPN-RK-30SP fuses are commonly used in:
- Motor feeder and branch circuits
- Transformer protection in industrial control systems
- Solenoid and inductive load circuits
- General-purpose DC and AC power distribution
- Equipment requiring selective coordination with other Low-Peak fuses
Compatibility & Replacements
Compatible With
- RK1 class fuse holders and clips (all standard ferrule-terminal cartridge fuse holders)
- 250V AC / 125V DC power distribution systems
- Industrial electrical panels and motor control centers
- Any circuit designed for Class RK1 30A protection
Replaces / Drop-In Replacement For
- LPN-RK30, LPN-RK-30, LPN-RK30A, LPN-RK-30A (all variant naming conventions)
- Older Bussmann LPN-RK series 30A units
- Note: This is the 250V variant; do not substitute LPS-RK-30SP (600V) in low-voltage circuits
Works With
- All RK1 class fuses and holders (enables simple 2:1 ampacity ratio coordination)
- Standard ferrule-terminal cartridge fuse systems
- AC and DC systems up to rated voltage
- System integrators and electrical contractors performing selective coordination
