FRN-R-25 Equivalent & Substitute Parts

Part Overview

The FRN-R-25 is a cartridge fuse manufactured by Eaton - Bussmann Electrical Division, rated for 25A at 250VAC/125VDC with slow-blow response characteristics. This component is classified as RK5 and is actively produced. Substitute parts become necessary when the primary manufacturer's stock is unavailable, when alternative certifications are required for specific regional applications, or when packaging preferences differ between procurement channels.

Substiute Parts

FRN-R-25

Eaton - Bussmann Electrical DivisionIn Stock: 1124FRN-R-25 Datasheet

Current PartRFQ

FLNR025.T

Littelfuse Inc.In Stock: 1030FLNR025.T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FRN-R-25 is determined by strict equivalence across the following parameters:

• Current Rating: 25A (exact match required)
• Voltage Rating: 250VAC / 125VDC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Class: RK5 (exact match required)
• Breaking Capacity: 200kA AC / 20kA DC (exact match required)
• Physical Form Factor: Cartridge, Non-Standard (exact match required)

The FLNR025.T from Littelfuse Inc. meets all substitution criteria. Minor dimensional variations (0.560" vs 0.563" diameter) remain within acceptable mechanical tolerances for cartridge fuse holders and do not affect electrical performance or safety ratings.

Parameter Comparison

Engineering Selection Recommendations

Both the FRN-R-25 and FLNR025.T are active products with full regulatory approvals (CE, CSA, UL). The FLNR025.T carries additional QPL certification and achieves ROHS3 compliance, making it suitable for applications with enhanced environmental or procurement requirements. The FRN-R-25 remains the primary choice where RoHS non-compliance is acceptable or where Eaton-specific supply chain requirements apply. Both parts are mechanically and electrically interchangeable within standard cartridge fuse holder assemblies.

Frequently Asked Questions (FAQ)

Q: Can FLNR025.T replace FRN-R-25 in existing installations?

A: Yes. Both parts are electrically and mechanically equivalent. The 0.003" diameter difference (14.22mm vs 14.30mm) is within standard cartridge fuse holder tolerances and does not affect fit or performance.

Q: What is the significance of the RoHS compliance difference?

A: The FLNR025.T is ROHS3 compliant while the FRN-R-25 is not. This distinction is relevant only for applications subject to RoHS regulations. Both parts function identically in electrical circuits.

Q: Are there any certification differences that affect substitution?

A: The FLNR025.T includes QPL certification in addition to CE, CSA, and UL approvals. This additional certification may be required for specific military or aerospace applications but does not restrict its use in general industrial applications.

Q: What packaging differences exist between these parts?

A: The FRN-R-25 is supplied in bulk packaging, while the FLNR025.T is supplied in box packaging. This affects procurement and storage but not component performance.

Q: Are both parts suitable for 250VAC and 125VDC applications?

A: Yes. Both parts are rated for 250VAC and 125VDC and are suitable for dual-voltage circuit protection applications.