Eaton RES-40 Fuse - Class H Time Lag, 10 kAIC
Part Number: RES-40
Quick Summary
The Eaton Bussmann RES fuse is a time-delay protective device designed for industrial and commercial electrical distributions. Engineers often struggle with nuisance trips during motor starts and inrush currents, which disrupt uptime and increase maintenance costs. RoHS compliant and built as a Class H fuse, this 40 A device provides a 10 kAIC interrupt rating at 250 Vac and a 600 V rating to support common power systems. With ferrule-end connections and standard packaging, it simplifies installation, replacement, and stocking for panel builders and systems integrators. Together with the Bussmann lineage, it offers predictable protection, reduced spare parts, and easier procurement in demanding industrial environments.
Product Information
Extended Description
RES-40 Eaton: Eaton Bussmann series RES fuse, time lag, non current-limiting, Industrial and commercial structures, 40 A, Class H, Non-indicating, Ferrule end x ferrule end, 10 kAIC at 250 Vac, Standard, 10, 600 V
Product Name
Eaton Bussmann series RES fuse
Catalog Number
RES-40
UPC
051712110402
EAN
5027590243995
Product Length/Depth
0.78 in
Product Height
5.5 in
Product Width
0.78 in
Product Weight
0.29 lb
Warranty
Not Applicable
Compliances
RoHS Compliant
Amperage Rating
40 A
Interrupt rating
10 kAIC at 250 Vac
Voltage rating
600 V
Packaging type
Standard
Class
Class H
Connection
Ferrule end x ferrule end
Fuse indicator
Non-indicating
Quantity
10
Special features
Super lag, time lag, non current-limiting
Bussmann series complete full line catalog no. 1007
Bussmann series complete full line catalog no. 1007
Bussmann series Fuseology
Eaton Specification Sheet - RES-40
Feature: Time-delay design (time lag) allows short startup surges without tripping prematurely. Business Impact: Improves equipment uptime and reduces nuisance trips, lowering maintenance costs. Application: Motor control centers and feeders in industrial facilities benefit from smoother starts and reliable protection. Feature: 40 A amperage rating and 600 V rating with a 10 kAIC at 250 Vac interrupt capability. Business Impact: Provides robust overcurrent protection for medium-load circuits while tolerating startup inrush. Application: Distribution panels and commercial power systems require dependable protection for feeders and branch circuits. Feature: Class H fuse construction. Business Impact: Enables selective coordination and higher instantaneous protection, improving safety margins and reducing upstream nuisance trips. Application: Service entrances and critical load centers in automation facilities. Feature: Ferrule end x ferrule end connections. Business Impact: Delivers reliable, easy-to-terminate connections that speed installation and reduce field torque concerns. Application: Standard panel assemblies and replacement with Bussmann compatible blocks. Feature: RoHS compliant and standard packaging. Business Impact: Supports regulatory compliance and streamlined procurement with readily available spares. Application: Manufacturing environments and data centers implementing green compliance and efficient supply chains. Feature: Packaging type Standard with 10 pieces per quantity. Business Impact: Simplifies stocking, reduces ordering complexity, and lowers part-number proliferation. Application: Procurement teams managing maintenance inventories across multiple sites.
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FAQs
To install the RES-40, use a compatible Bussmann fuse holder or block designed for ferrule-end fuses. Ensure the panel is de-energized, insert the ferrule ends fully into the terminals, and tighten to the manufacturer's torque specification. Verify a 600 V rating is suitable for the circuit and confirm the overall system can support up to 10 kAIC at 250 Vac.
The RES-40 is rated for 40 A, with a voltage rating of 600 V and an interrupt rating of 10 kAIC at 250 Vac. This combination supports protection for standard industrial feeders while tolerating startup inrush in many commercial and industrial panel applications.
Yes, thanks to its time-delay (time-lag) design, the RES-40 accommodates brief inrush currents common during motor starts without unnecessary tripping. It is best applied to circuits where controlled startup is desired, such as motor control centers and feeder protection in automation systems.
The RES-40 is RoHS compliant, aligning with environmental and regulatory requirements for many manufacturing and industrial environments. This helps ease procurement for designs prioritizing restricted substance limits while maintaining reliable protection performance.
Official RES-40 documentation is available from Eaton/Bussmann sources, including the Bussmann catalog 1007, the Eaton specification sheet for RES-40, and related Fuseology media. These resources provide detailed specs, installation guidance, and compatibility notes for integration into control panels and distribution boards.