5SFP 250-R Equivalent & Substitute Parts

Part Overview

The 5SFP 250-R is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse in a 5mm x 20mm axial package manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability in existing circuit protection applications.

Substiute Parts

5SFP 250-R

Bel Fuse Inc.In Stock: 11625SFP 250-R Datasheet

Current PartRFQ

0034.1510.PT

SCHURTER Inc.In Stock: 37440034.1510.PT Datasheet

DirectRFQ

BK/S500-V-250-R

Eaton - Electronics DivisionIn Stock: 843BK/S500-V-250-R Datasheet

DirectRFQ

0217.250MXEP

Littelfuse Inc.In Stock: 27340217.250MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 250-R are qualified based on the following mandatory parameters:

• Current Rating: 250 mA (exact match required)
• Voltage Rating (AC): 250 V (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 @ Rated Voltage: 35 A (exact match required)

All substitute parts listed below meet these criteria and are sourced from active manufacturers with current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0034.1510.PT (SCHURTER Inc.), BK/S500-V-250-R (Eaton - Electronics Division), and 0217.250MXEP (Littelfuse Inc.)—are direct functional equivalents to the 5SFP 250-R. Selection should be based on the following factors:

Certification Coverage: BK/S500-V-250-R offers the broadest approval agency coverage (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE), making it suitable for applications requiring multiple regional compliance certifications. The 0217.250MXEP includes K-MARK and UL certifications in addition to CCC, CE, CSA, SEMKO, and VDE. The 0034.1510.PT carries cURus certification.

Inventory Availability: 0034.1510.PT has the highest current stock (3,728 pcs), followed by 0217.250MXEP (2,690 pcs) and BK/S500-V-250-R (766 pcs).

Physical Dimensions: All parts fit the 5mm x 20mm package specification. Minor dimensional variations exist within tolerance: 5SFP 250-R measures 0.217" Dia x 0.827" L; 0034.1510.PT measures 0.213" Dia x 0.886" L; BK/S500-V-250-R measures 0.218" Dia x 0.831" L; 0217.250MXEP measures 0.236" Dia x 0.886" L.

Electrical Characteristics: DC cold resistance values vary: 5SFP 250-R (0.95 Ohms), 0034.1510.PT (not specified), BK/S500-V-250-R (4.3 Ohms), and 0217.250MXEP (1.2325 Ohms). Melting I²t values also differ slightly across manufacturers.

Frequently Asked Questions (FAQ)

Q: Can 0034.1510.PT, BK/S500-V-250-R, and 0217.250MXEP be used interchangeably with the 5SFP 250-R?

A: Yes. All three parts meet the mandatory electrical and mechanical parameters: 250 mA current rating, 250 V AC voltage rating, fast-blow response, 35 A breaking capacity, and 5mm x 20mm axial package. They are direct functional equivalents for circuit protection applications.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The 5SFP 250-R is obsolete, meaning Bel Fuse Inc. no longer manufactures it. The three substitute parts are active products with current manufacturing and inventory support from SCHURTER Inc., Eaton - Electronics Division, and Littelfuse Inc., respectively.

Q: Are there differences in approval certifications between the substitute parts?

A: Yes. BK/S500-V-250-R carries the most comprehensive certification set (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE). Selection should align with the specific regional compliance requirements of your application.

Q: Do the physical dimension variations affect mechanical compatibility?

A: All parts conform to the 5mm x 20mm axial package specification and are designed for through-hole mounting. Minor diameter and length variations fall within standard tolerance ranges for this package type and do not affect mechanical interchangeability in standard fuse holders.

Q: What is the difference between melting I²t values across these parts?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations (0.05 for 5SFP 250-R, 0.0159 for 0034.1510.PT, 0.28 for BK/S500-V-250-R, and 0.04 for 0217.250MXEP) reflect different fuse element designs. All parts maintain the same 250 mA current rating and fast-blow response characteristic.

Q: Which substitute part should I select for new designs?

A: Selection depends on certification requirements, supply chain preferences, and inventory availability. For applications requiring broad international compliance, BK/S500-V-250-R is recommended. For maximum inventory availability, 0034.1510.PT is preferred. For applications requiring UL or K-MARK certification, 0217.250MXEP is suitable.