Overview
The Reliance ECSR40 is a dual-element Class RK5 time delay fuse engineered for industrial motor circuits and equipment protection. With a 40-ampere rating at 600VAC, this fuse combines reliable overcurrent protection with a 10-second response time at 500% overload, making it ideal for circuits with motor surge currents and inductive loads. The 200kA short circuit interrupting rating provides comprehensive fault protection while reducing the risk of nuisance trips common in traditional fast-blow fuses.
Key Features
- Dual-Element Design: Time delay capability handles motor inrush currents without false interruptions
- 40A Current Rating: Sized for medium-duty industrial motor and control circuits
- 600VAC Rated: Suitable for standard three-phase and single-phase industrial distributions
- Class RK5 Standard: Meets UL 248-12 and CSA C22.2 No. 248.12 for motor overload and short-circuit protection
- 200kA Interrupting Rating: High breaking capacity for fault conditions and equipment protection
- Ferrule Terminals: Secure, standardized connections for fused disconnect switches and panel-mount holders
Technical Specifications
The ECSR40 meets Class RK5 standards with compact ferrule-end construction for use in standard cartridge fuse holders. Its time delay characteristic allows engineers to select fuse ratings much closer to full-load amperage than non-time-delay alternatives, reducing component size and cost across switchgear and control panels.
Typical Applications
- AC motor circuit protection in industrial machines and production lines
- Control panel and transformer circuits subject to inrush currents
- Equipment with inductive loads requiring surge protection
- Industrial distribution circuits rated 600V and below
- OEM and retrofit installations in process equipment and automation systems
Compatibility & Replacements
Compatible With
- Standard Class RK5 cartridge fuse holders rated 600VAC
- Industrial disconnect switches, motor starters, and control panels
- Fused equipment designed for 600V three-phase and single-phase circuits
- Power distribution systems with ferrule-end fuse mounting
Replaces / Drop-In Replacement For
- Edison ECSR40 (same fuse, alternative brand marking)
- Bussmann ECSR40 (Cooper Bussmann original manufacture)
- Other Class RK5 40A 600V dual-element time delay fuses with identical ferrule dimensions
Works With
- Class RK5 fuse holders and cartridge clips
- 660V, 480V, 460V, 440V, and 380V three-phase systems
- Any circuit protection scheme requiring Class RK5 dual-element fuses
- System designs requiring 40A overcurrent protection with motor-grade time delay
