Overview
The Edison LESRK 4 1/2 Class RK1 fuses are dual-element, time-delay (slow-blow) fuses designed for AC power distribution and motor protection. This lot contains 7 fuses, each rated at 4.5 amperes, 600 VAC, with a 200 kA interrupting capacity. Edison LESRK fuses provide superior overload tolerance and are UL Listed and CSA certified for reliability in branch circuits, motor feeders, and general-purpose electrical systems.
Key Features
- Dual-element spring-trigger design allows motor backup protection at 125% full-load amperage (FLA)
- Current-limiting action provides short-circuit component protection
- Reliable time-delay operation minimizes nuisance trips from inrush currents
- Compact Edison-style body fits standard RK1 fuse holders and clips
- UL Class RK1 and CSA certified for code compliance
Technical Specifications
| Ampere Rating | 4.5 A |
| Voltage Rating | 600 VAC |
| Fuse Class | RK1 |
| Fuse Type | Dual-Element, Time-Delay |
| Interrupting Rating | 200,000 RMS Symmetrical Amps |
| Self-Certified Interrupting Rating | 300,000 RMS Symmetrical Amps |
| DC Rating (LESRK 4.5) | 200 VDC |
| Operating Temperature | –40 to +70°C |
| Mounting Style | Clip-on (Edison-style holder) |
| UL File Number | JDDZ.E4273 |
| Agency Approvals | UL 248-12, CSA C22.2 No. 248.12 |
| Quantity in Lot | 7 Fuses |
Typical Applications
- Motor branch circuits and feeders requiring soft-start tolerance
- AC power distribution system mains and feeders
- Lighting, heating, and general-purpose circuits
- Industrial equipment and machinery protection
- Type 2 protection for IEC components
Compatibility & Replacements
Compatible With
- Standard Class RK1 Edison-style fuse holders and clips
- Electrical distribution panels and fuse blocks rated for RK1 fuses
- NEMA and IEC-compliant power distribution systems
- Any AC system rated 600 VAC or less, 4.5 A circuits
Replaces / Drop-In Replacement For
- Cooper Bussmann LPS-RK 4.5 (electrically equivalent dual-element fuse)
- Other manufacturers’ Class RK1, 4.5 A, 600 VAC time-delay fuses of similar form factor
- Verify interchangeability with your fuse block manufacturer before ordering
Works With
- All UL Class RK1–rated fuse holders and clip assemblies
- Motor overload protection relays and combination starters
- Soft-start devices and variable frequency drives (VFDs) requiring time-delay protection
- Standard electrical distribution panels and switchboards
