Overview
The Edison LESRK-4-1/2 is a Class RK1 dual-element, time-delay fuse designed for 600Vac circuits. This 4.5A fuse provides excellent selectivity and protection in motor-driven equipment and inductive loads, making it a standard choice for industrial electrical systems. Manufactured by Eaton’s Bussmann division (Edison brand), this fuse combines proven time-delay technology with current-limiting performance.
Key Features
- Dual-element, time-delay design for motor circuit protection
- Class RK1 current-limiting fuse with 200 kAIC interrupting rating
- Rated 600Vac; compatible with 300Vdc at lower amperage ranges
- Non-indicating (closed-end cap) design
- UL 248-12 and CSA C22.2 No. 248.12 certified
- Selective coordination for improved circuit breaker protection
Technical Specifications
The LESRK-4-1/2 meets strict UL and CSA standards for branch circuit protection in industrial and commercial environments:
- Ampere Rating: 4.5A
- Voltage Rating: 600Vac / 300Vdc (at lower ratings)
- Fuse Class: RK1 (current-limiting)
- Operating Type: Dual-element, time-delay
- Interrupting Rating: 200 kAIC @ 600Vac
- Certifications: UL 248-12, CSA C22.2 No. 248.12
- Package Quantity: 3 units per lot
Typical Applications
Class RK1 time-delay fuses like the LESRK-4-1/2 are widely used for:
- Motor branch circuits and motor control centers (MCC)
- Industrial machinery requiring inrush current tolerance
- Equipment with high starting currents (compressors, pumps, fans)
- Circuits where improved selectivity and short-circuit protection is required
- Legacy electrical panels and motor protection assemblies
Compatibility & Replacements
Compatible With
- Class RK1 fuse clips and fuse holders (industry standard)
- Electrical panels and motor control centers rated for Class RK1 fuses
- 660V and 600V AC industrial distribution systems
- Motor circuits with induction and synchronous motors
- NEMA-rated circuit protection assemblies
Replaces / Drop-In Replacement For
- Bussmann LPS-RK-SP 4.5A time-delay fuse
- Mersen/Gould A6DR 4.5A Class RK1 fuse
- Littelfuse LLSRK 4.5A dual-element time-delay fuse
- Other equivalent 4.5A Class RK1 time-delay units from legacy inventory
Works With
- Class RK1 fuse cartridge holders and blocks
- Standard industrial electrical systems up to 600Vac
- Motor protection circuits and soft-starter applications
- UL 489 and CSA-listed circuit breaker assemblies (as recommended by OEM)
