5SFP 2.5 Equivalent & Substitute Parts

Part Overview

The 5SFP 2.5 is a 2.5 A 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The 5SFP 2.5 series has been superseded by active production alternatives that maintain electrical and mechanical compatibility while offering improved compliance status.

Substiute Parts

5SFP 2.5

Bel Fuse Inc.In Stock: 11415SFP 2.5 Datasheet

Current PartRFQ

5SFP 2.5-R

Bel Fuse Inc.In Stock: 25095SFP 2.5-R Datasheet

DirectRFQ

5MFP 2.5-R

Bel Fuse Inc.In Stock: 20705MFP 2.5-R Datasheet

Parametric EquivalentRFQ

0034.1520.PT

SCHURTER Inc.In Stock: 18240034.1520.PT Datasheet

DirectRFQ

021702.5MXEP

Littelfuse Inc.In Stock: 2287021702.5MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5SFP 2.5 is determined by strict equivalence in the following parameters: current rating (2.5 A), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm axial), fuse type (cartridge glass), and mounting configuration (through hole). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional replacement in circuit protection applications.

The substitute parts are grouped as follows:

Direct Manufacturer Equivalent: 5SFP 2.5-R (Bel Fuse Inc.) — identical part number with active production status and improved RoHS3 compliance.

Parametric Equivalent: 5MFP 2.5-R (Bel Fuse Inc.) — same electrical ratings and package, different series designation with active status.

Cross-Manufacturer Direct Equivalent: 0034.1520.PT (SCHURTER Inc.) — maintains all critical electrical and mechanical parameters with active production.

Cross-Manufacturer Similar Equivalent: 021702.5MXEP (Littelfuse Inc.) — equivalent electrical and mechanical specifications with comprehensive international certifications.

Parameter Comparison

Engineering Selection Recommendations

5SFP 2.5-R (Bel Fuse Inc.) is the primary recommended substitute. This part maintains identical electrical specifications and package form factor while offering active production status and ROHS3 compliance. It includes expanded approval certifications (CCC, cULus) compared to the original 5SFP 2.5, making it suitable for applications requiring current regulatory compliance.

5MFP 2.5-R (Bel Fuse Inc.) serves as an alternative within the same manufacturer ecosystem. While electrically equivalent, it features a higher breaking capacity (200 A versus 35 A) and different melting I²t characteristics. This part is appropriate for applications where enhanced breaking capacity provides additional safety margin.

0034.1520.PT (SCHURTER Inc.) provides cross-manufacturer equivalence with active production status and ROHS3 compliance. Dimensional variations exist (5.40mm diameter x 22.50mm length versus 5.50mm x 21.00mm), requiring physical verification of fit within existing fuse holders before deployment.

021702.5MXEP (Littelfuse Inc.) offers the broadest international certification coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE) and is suitable for applications requiring multi-regional compliance. Dimensional differences (5.80mm diameter x 22.50mm length) must be confirmed for mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can 5SFP 2.5-R directly replace 5SFP 2.5 in existing designs?

A: Yes. The 5SFP 2.5-R maintains identical electrical ratings (2.5 A, 250 V AC), response time (fast blow), and package dimensions (5mm x 20mm axial). It is a direct form-fit-function replacement with improved compliance status.

Q: What is the difference between 5SFP 2.5-R and 5MFP 2.5-R?

A: Both parts share identical current and voltage ratings. The primary difference is breaking capacity: 5SFP 2.5-R provides 35 A breaking capacity, while 5MFP 2.5-R provides 200 A. The 5MFP 2.5-R is suitable for applications requiring higher fault current handling capability.

Q: Are there dimensional differences between substitute parts?

A: Yes. The original 5SFP 2.5 and 5SFP 2.5-R measure 5.50mm diameter x 21.00mm length. The SCHURTER 0034.1520.PT measures 5.40mm x 22.50mm, and the Littelfuse 021702.5MXEP measures 5.80mm x 22.50mm. Physical verification of fuse holder compatibility is required before substitution.

Q: Which substitute part has the best compliance certifications?

A: The Littelfuse 021702.5MXEP (021702.5MXEP) carries the most comprehensive international certifications: BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. This part is optimal for applications requiring multi-regional regulatory approval.

Q: Is the 5SFP 2.5 still available for purchase?

A: The 5SFP 2.5 is classified as obsolete. Active production alternatives (5SFP 2.5-R, 5MFP 2.5-R, 0034.1520.PT, and 021702.5MXEP) are available from component distributors and are recommended for new designs and ongoing maintenance.

Q: What is the melting I²t specification and why does it vary between substitutes?

A: Melting I²t is a thermal characteristic indicating the energy required to melt the fuse element. The original 5SFP 2.5 specifies 10.2, while substitutes range from 7.6 to 10. These variations reflect different fuse element designs but do not affect functional equivalence at the specified 2.5 A rating.