Overview
The Cooper Bussmann LPS-RK-4-1/2SP is a Class RK1 Low-Peak cartridge fuse rated 4.5A at 600VAC / 300VDC. This dual-element, time-delay fuse provides current-limiting protection and meets UL and CSA safety standards. The LPS-RK series is widely used in industrial control panels, motor circuits, transformer protection, and general-purpose branch circuits where coordinated overload and short-circuit protection is required.
Key Features
- Dual-element time-delay design reduces nuisance trips from inrush current
- Current-limiting Class RK1 fuse—300 kAIC interrupting rating at 250V
- UL Listed (JDDZ File E4273) and CSA Certified per C22.2 No. 248.12
- Non-indicating cartridge format fits standard RK1 fuse blocks
- Compact 0.81″ diameter × 2″ length dimensions for space-constrained panels
Technical Specifications
- Ampere Rating: 4.5A (also labeled 4-1/2A)
- Voltage Rating: 600VAC / 300VDC
- Interrupting Capacity: 300 kAIC @ 250V; 100 kAIC @ 125VDC
- Fuse Type: Dual-Element, Time-Delay, Current-Limiting
- Class: RK1 per UL 248-10 and CSA C22.2 No. 248.12
- Time-Delay: 8 seconds at 500% rated current
- Diameter × Length: 0.81″ × 2″ (20.6 mm × 51 mm)
- Approvals: UL Listed, CSA Certified, CE Marked
- Quantity: Box of 10 fuses
Typical Applications
- Motor starter circuits and variable frequency drive (VFD) branch circuits
- Feeder and subfeed protection in distribution switchboards and panelboards
- Transformer and solenoid coil protection
- Industrial machinery and equipment control circuits
- Any RK1-rated low-voltage circuit requiring coordinated time-delay protection
Compatibility & Replacements
Compatible With
- Standard RK1 cartridge fuse blocks and clips
- Motor control centers (MCCs) with RK1 fuse accommodation
- Industrial distribution panels and switchboards rated for Class RK1 fuses
- Power distribution equipment up to 600VAC / 300VDC
Replaces / Drop-In Replacement For
- Eaton Bussmann LPS-RK-4-1/2SP
- Previous Cooper Bussmann LPS-RK-4-1/2SP inventory
Works With
- RK1-class fuse blocks and cartridge holders per UL 248-10
- Distribution switchboard and panelboard assemblies rated for Class RK1
- Motor control circuits and VFD input protection schemes
- Any equipment designed for 600VAC / 300VDC dual-element time-delay fuses
