5SF 8 Glass Cartridge Fuse 8A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The 5SF 8 is an 8A 250VAC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor. This component is classified as obsolete, requiring identification of active equivalent alternatives for new designs and ongoing maintenance applications. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure direct interchangeability in existing circuits.

Substiute Parts

5SF 8

Bel Fuse Inc.In Stock: 7415SF 8 Datasheet

Current PartRFQ

5SF 8-R

Bel Fuse Inc.In Stock: 215035SF 8-R Datasheet

DirectRFQ

0217008.MXBP

Littelfuse Inc.In Stock: 8010217008.MXBP Datasheet

DirectRFQ

0217008.MXP

Littelfuse Inc.In Stock: 41200217008.MXP Datasheet

DirectRFQ

0217008.TXP

Littelfuse Inc.In Stock: 10130217008.TXP Datasheet

DirectRFQ

0217008.VXP

Littelfuse Inc.In Stock: 11030217008.VXP Datasheet

DirectRFQ

0034.1525

SCHURTER Inc.In Stock: 60270034.1525 Datasheet

SimilarRFQ

0217008.HXP

Littelfuse Inc.In Stock: 26090217008.HXP Datasheet

SimilarRFQ

GDB-8A

Eaton - Electronics DivisionIn Stock: 823GDB-8A Datasheet

SimilarRFQ

S500-8-R

Eaton - Electronics DivisionIn Stock: 714S500-8-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (8A), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), physical dimensions (5mm x 20mm), and breaking capacity (80A). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional interchangeability within circuits designed for the 5SF 8.

The substitute parts are categorized as follows:

Direct Substitutes (Same Manufacturer): 5SF 8-R from Bel Fuse Inc. is an active-status variant of the original part with identical electrical specifications and improved RoHS3 compliance.

Cross-Manufacturer Direct Equivalents: Parts from Littelfuse Inc. (0217008.MXBP, 0217008.MXP, 0217008.TXP, 0217008.VXP) and SCHURTER Inc. (0034.1525) meet all core electrical and mechanical parameters.

Similar Alternatives: Parts from Eaton Electronics Division (GDB-8A, S500-8-R) and additional Littelfuse variants (0217008.HXP) provide functional equivalence with minor variations in secondary parameters such as DC cold resistance or approval agency certifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5SF 8-R (Bel Fuse Inc.) is the direct active replacement, maintaining manufacturer continuity while achieving RoHS3 compliance. This part is preferred for applications requiring minimal design validation.

Cross-Manufacturer Alternatives: Littelfuse 0217008 series parts (MXBP, MXP, TXP, VXP, HXP) provide equivalent electrical performance with broader international certification coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE) and are suitable for global applications. Higher melting I²t values (198.16 vs. 103) indicate slightly different thermal response characteristics within the fast-blow classification.

Secondary Alternatives: SCHURTER 0034.1525 and Eaton GDB-8A / S500-8-R maintain all core electrical and mechanical parameters. Selection among these should consider specific certification requirements for the target application region and existing supply chain relationships.

Compliance Consideration: All active substitute parts achieve RoHS3 compliance, addressing regulatory requirements for new designs. The original 5SF 8 (obsolete, non-compliant) should not be specified for new applications.

Frequently Asked Questions (FAQ)

Q: Can 5SF 8-R directly replace 5SF 8 in existing circuits?

A: Yes. 5SF 8-R maintains identical electrical ratings (8A, 250VAC), response time (fast blow), and mechanical dimensions (5x20mm). Both require the same holder type. The primary difference is product status (active vs. obsolete) and RoHS3 compliance.

Q: What is the difference between Littelfuse 0217008.MXBP and 0217008.MXP?

A: Both parts meet identical electrical specifications (8A, 250VAC, fast blow, 5x20mm). Differences exist only in melting I²t values and specific approval agency certifications. Selection should be based on regional certification requirements and supply availability.

Q: Are Eaton GDB-8A and S500-8-R interchangeable with Littelfuse parts?

A: Yes, within the constraints of this product category. All parts maintain 8A, 250VAC, fast-blow response, and 5x20mm dimensions. Minor variations in DC cold resistance (0.01Ω vs. 0.0068Ω) and approval certifications exist but do not affect functional interchangeability in standard circuit protection applications.

Q: Does melting I²t variation affect substitution suitability?

A: Melting I²t values (ranging from 93.4 to 198.16 across the substitute list) represent thermal energy absorption characteristics. All listed parts maintain fast-blow response classification and 8A current rating. Substitution is valid based on the provided electrical specifications; however, circuit designers should verify that thermal response characteristics align with specific application requirements.

Q: Which substitute part offers the best compliance profile?

A: All active substitute parts achieve RoHS3 compliance. Littelfuse 0217008 series parts provide the broadest international certification coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE), making them suitable for multi-region applications. 5SF 8-R offers manufacturer continuity with Bel Fuse Inc.

Q: Can these parts be used in both AC and DC circuits?

A: The 5SF 8 and all listed substitutes are rated for 250V AC. DC application suitability is not specified in the provided parameters and must be verified against specific circuit requirements and manufacturer datasheets.