Eaton FRS-R-1/8 Fuse - RK5 Class, 0.125A, 200kAIC
Part Number: FRS-R-1/8
Quick Summary
The Eaton FRS-R-1/8 fuse is a time-delay, current-limiting device designed to protect small control circuits in industrial equipment. Its dual-element construction tolerates short surges without nuisance trips, helping keep critical equipment online. Designers often struggle to balance fast fault clearance with reliability when selecting branch-circuit fuses for variable loads. This model is CE marked and classified as RK5, offering predictable performance in panel installations and service environments. It complements standard Bussmann series inventories and is compatible with common control-panel layouts, reducing spare-part complexity. By choosing this fuse, manufacturers gain safer protection, straightforward replacement, and a compact form-factor suitable for crowded electrical enclosures.
Product Information
Extended Description
FRS-R-1/8 Eaton: Eaton Bussmann Series Class RK5 fuse, FRS-R, time-delay, dual-element, current limiting fuse, 0.125 A, non-indicating fuse, interrupting rating of 200 kA at 600 Vac and 20 kA at 300 Vdc
Product Name
Eaton Bussmann series FRS-R fuse
Catalog Number
FRS-R-1/8
UPC
051712507981
Product Length/Depth
5 in
Product Height
0.81 in
Product Width
0.81 in
Product Weight
0.15 lb
Warranty
Not Applicable
Compliances
CE Marked
Amperage Rating
0.125A
Interrupt rating
20 kAIC at 300 Vdc 200 kAIC at 600 Vac
Response time
10 sec at 500%
Voltage rating
600 Vac, 300 Vdc
Number of elements
Dual
Packaging type
Standard
Class
Class RK5
Fuse indicator
Non-indicating
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Bussmann series FRS-R 600 V Class R up to 60 A fuse data sheet no. 1017
Feature: Time-delay, dual-element, current-limiting fuse. Benefit: Reduces nuisance trips while preserving circuit protection during short surges, improving overall equipment uptime. Application: Control panels and small automation circuits where load profiles vary and reliability matters. Feature: High interrupt rating of 200 kAIC at 600 Vac and 20 kAIC at 300 Vdc. Benefit: Proven fault-current handling protects wiring and components in both AC mains and DC filtered loops, minimizing cascade failures. Application: Power distribution and motor-control circuits subject to high fault currents. Feature: RK5 class, non-indicating construction. Benefit: Standardized protection with straightforward replacement and maintenance across multiple panels. Application: Installed fleets of Bussmann-series fuses in industrial sites seeking uniform protection. Feature: 5 in length, 0.81 in width, 0.15 lb weight. Benefit: Compact footprint for crowded enclosures and easy inventory management. Application: Retrofit projects and space-constrained control cabinets. Feature: Voltage rating of 600 Vac / 300 Vdc and 10 sec response at 500% overload. Benefit: Reliable coordination for mixed-voltage systems and predictable outage timing. Application: Mixed-supply automation equipment and programmable logic controllers.
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FAQs
Install the FRS-R-1/8 fuse into a compatible RK5 fuse holder with the correct orientation for the circuit. Ensure the panel is de-energized and that wiring conforms to local code. The 5 in length and 0.81 in width fit standard Bussmann series holders, and replacement is straightforward due to the non-indicating design, which simplifies field swaps without additional indicators.
The fuse provides 200 kAIC interrupt rating at 600 Vac and 20 kAIC at 300 Vdc, with a voltage rating of 600 Vac / 300 Vdc. Its time-delay or slow-blow characteristics accommodate short surges, with a specified 10-second response at 500% overload, delivering reliable protection without nuisance trips in typical applications.
Yes, for many automation and control-panel applications. The time-delay, dual-element design is well-suited for motor-start surges, while the RK5 class provides standardization across panels. Ensure the amperage rating (0.125 A) aligns with the protected circuit, and verify coordination with upstream protection to avoid unnecessary disconnections during faults.
The FRS-R-1/8 is CE marked, meeting European electrical protection requirements. It is part of the RK5 class fuse family, which is widely adopted for standardized protection in control circuits. For additional RoHS compliance information, Eaton provides resources via their RoHS search tools and technical bulletins.
With a non-indicating design and a compact 5 in x 0.81 in form factor, it simplifies replacement in dense panels, reducing downtime during maintenance. The RK5 compatibility supports a single spare-part strategy across multiple panels, lowering inventory costs. The time-delay feature minimizes false trips during startup surges, improving machine availability and overall ROI.