Bel Fuse Inc. 5SF 4 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5SF 4 is a 4 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor, designed for use with compatible fuse holders. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The 5SF 4 series provides overcurrent protection across industrial and commercial applications requiring fast response characteristics and international safety certifications.

Substiute Parts

5SF 4

Bel Fuse Inc.In Stock: 11065SF 4 Datasheet

Current PartRFQ

5SF 4-R

Bel Fuse Inc.In Stock: 239535SF 4-R Datasheet

Parametric EquivalentRFQ

0217004.HXP

Littelfuse Inc.In Stock: 56480217004.HXP Datasheet

DirectRFQ

0217004.MXBP

Littelfuse Inc.In Stock: 9510217004.MXBP Datasheet

DirectRFQ

0217004.MXP

Littelfuse Inc.In Stock: 270780217004.MXP Datasheet

DirectRFQ

0217004.TXP

Littelfuse Inc.In Stock: 10590217004.TXP Datasheet

DirectRFQ

0217004.VXP

LittelfuseIn Stock: 11100217004.VXP Datasheet

DirectRFQ

0034.1522

SCHURTER Inc.In Stock: 63290034.1522 Datasheet

SimilarRFQ

0034.3883

SCHURTER Inc.In Stock: 12010034.3883 Datasheet

SimilarRFQ

BK1/S500-4-R

Eaton - Electronics DivisionIn Stock: 1003BK1/S500-4-R Datasheet

SimilarRFQ

GDB-4A

Eaton - Electronics DivisionIn Stock: 692GDB-4A Datasheet

SimilarRFQ

S500-4-R

Eaton - Electronics DivisionIn Stock: 888S500-4-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 4 is determined by strict equivalence across the following parameters: current rating (4 A), voltage rating (250 V AC), response time (fast blow), physical package (5mm x 20mm), fuse type (cartridge glass), and mounting requirement (holder-based). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional compatibility within existing fuse holder assemblies.

Substitute parts are grouped into three categories:

Parametric Equivalent (Same Manufacturer): The 5SF 4-R from Bel Fuse Inc. maintains identical electrical and mechanical specifications with active product status and improved RoHS3 compliance.

Direct Manufacturer Equivalents (Littelfuse Inc.): Parts 0217004.HXP, 0217004.MXBP, 0217004.MXP, and 0217004.TXP, and 0217004.VXP from Littelfuse Inc. series 217 meet all core parameters with active status and enhanced international certifications.

Similar Manufacturer Alternatives (SCHURTER Inc. and Eaton): Parts 0034.1522, 0034.3883, BK1/S500-4-R, GDB-4A, and S500-4-R provide functional equivalence with variations in breaking capacity, melting I²t, and approval agencies. These parts are suitable where application-specific requirements align with their documented specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: The 5SF 4-R from Bel Fuse Inc. is the direct parametric equivalent with active product status and ROHS3 compliance. This part maintains manufacturer continuity and identical electrical characteristics while addressing obsolescence concerns.

Secondary Recommendations: Littelfuse Inc. 0217004 series parts (HXP, MXBP, MXP, TXP, VXP) provide active alternatives with comprehensive international certifications including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. These parts feature slightly elevated melting I²t values (29.165 versus 26) within acceptable tolerance for fast-blow applications.

Alternative Selections: SCHURTER Inc. 0034.1522 (FSF 5x20 series) and Eaton BK1/S500-4-R maintain core electrical specifications with active status. The SCHURTER 0034.3883 (FSK 5x20 series) features significantly higher breaking capacity (200 A) and lower melting I²t (13.31), suitable only for applications where these characteristics align with circuit protection requirements. The Eaton GDB-4A series provides functional equivalence with limited certification documentation.

Selection should prioritize parts with active product status and compliance certifications matching the target application's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5SF 4 be directly replaced with the 5SF 4-R?

A: Yes. The 5SF 4-R is a parametric equivalent from the same manufacturer with identical current rating (4 A), voltage rating (250 V), response time (fast blow), and physical package (5mm x 20mm). The primary difference is active product status and ROHS3 compliance versus the obsolete, non-compliant original part.

Q: Are Littelfuse 0217004 series parts fully compatible?

A: Yes, for electrical and mechanical compatibility. All Littelfuse 0217004 variants (HXP, MXBP, MXP, TXP, VXP) meet the core parameters: 4 A, 250 V, fast blow, 5mm x 20mm package. Minor differences exist in melting I²t (29.165 versus 26) and dimensional tolerances (5.20mm diameter versus 5.10mm), which remain within acceptable ranges for standard fuse holder applications.

Q: What is the difference between the SCHURTER 0034.1522 and 0034.3883?

A: Both maintain 4 A, 250 V, fast-blow specifications in 5mm x 20mm packages. The 0034.1522 (FSF series) has breaking capacity of 40 A and melting I²t of 25.6. The 0034.3883 (FSK series) has breaking capacity of 200 A and melting I²t of 13.31. Selection depends on circuit protection requirements; the FSK variant is suitable for applications requiring higher breaking capacity and faster response.

Q: Do all substitute parts fit existing 5SF 4 fuse holders?

A: All listed substitutes maintain the 5mm x 20mm cartridge form factor and require holder-based mounting, ensuring mechanical compatibility with standard 5x20mm fuse holders. Dimensional tolerances (5.10mm to 5.20mm diameter) fall within typical holder specifications.

Q: Which substitute offers the best compliance profile?

A: Littelfuse 0217004 series parts provide the most comprehensive certification coverage, including BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. These parts are suitable for applications requiring broad international regulatory compliance.

Q: Is the Eaton GDB-4A suitable as a replacement?

A: The GDB-4A meets core electrical and mechanical parameters (4 A, 250 V, fast blow, 5mm x 20mm). However, certification documentation is limited to VDE and UR. Selection should confirm alignment with application-specific regulatory requirements before implementation.