5SFP 250 Equivalent & Substitute Parts

Part Overview

The 5SFP 250 is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement. Substitute parts must maintain identical electrical ratings, response characteristics, and mechanical compatibility to ensure reliable circuit protection without design modification.

Substiute Parts

5SFP 250

Bel Fuse Inc.In Stock: 10005SFP 250 Datasheet

Current PartRFQ

0034.1510.PT

SCHURTER Inc.In Stock: 37440034.1510.PT Datasheet

DirectRFQ

0217.250MXEP

Littelfuse Inc.In Stock: 27340217.250MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5SFP 250 is determined by strict equivalence across the following parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Both identified substitute parts meet all mandatory electrical and mechanical criteria. Dimensional variations within the 5mm x 20mm axial envelope and differences in melting I²t values remain within acceptable tolerance for circuit protection function.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts satisfy the mandatory electrical and mechanical requirements for direct replacement of the 5SFP 250.

The 0034.1510.PT (SCHURTER FSF 5x20 series) is an active product with ROHS3 compliance and cURus certification. This part is suitable for applications requiring current regulatory compliance.

The 0217.250MXEP (Littelfuse 217 series) is an active product with ROHS3 compliance and comprehensive international certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. This part offers the broadest certification coverage and is suitable for applications with stringent global compliance requirements.

Selection between these two substitutes should be based on system certification requirements, supply chain availability, and existing component qualification within the target application.

Frequently Asked Questions (FAQ)

Q: Can the 0034.1510.PT and 0217.250MXEP be used interchangeably with the 5SFP 250?

A: Yes. Both parts meet all mandatory electrical parameters (250 mA, 250 V AC, fast-blow response, 35 A breaking capacity) and mechanical specifications (5mm x 20mm axial, through-hole mounting). Dimensional variations and melting I²t differences remain within acceptable tolerance for circuit protection function.

Q: What is the significance of the melting I²t difference between these parts?

A: Melting I²t defines the thermal energy required to melt the fuse element. The values provided (0.05, 0.0159, and 0.04) represent the thermal energy characteristics of each manufacturer's design. All three parts are rated for identical current and voltage, ensuring equivalent circuit protection performance at the specified 250 mA rating.

Q: Are there dimensional compatibility concerns with the different case sizes?

A: All three parts conform to the 5mm x 20mm axial package specification. Dimensional variations (5.40mm to 6.00mm diameter, 21.00mm to 22.50mm length) remain within the standard 5x20 envelope and are compatible with standard fuse holders designed for this form factor.

Q: What is the impact of RoHS compliance differences?

A: The 5SFP 250 is RoHS non-compliant, while both substitute parts are ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the 0034.1510.PT or 0217.250MXEP must be selected. For legacy systems without RoHS requirements, all three parts are functionally equivalent.

Q: Which substitute part has the broader certification coverage?

A: The 0217.250MXEP (Littelfuse) carries certifications from CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. The 0034.1510.PT (SCHURTER) carries cURus certification. The original 5SFP 250 carries CE, CSA, IMQ, SEMKO, UL, and VDE certifications. Selection should align with the specific certifications required by the target application or end market.