5SFP 4-R Equivalent & Substitute Parts

Part Overview

The 5SFP 4-R is a 4A 250VAC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 5mm x 20mm form factor applications. This component is active in production and widely used in industrial and consumer electronics for circuit protection. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in circuit designs without functional compromise.

Substiute Parts

5SFP 4-R

Bel Fuse Inc.In Stock: 19215SFP 4-R Datasheet

Current PartRFQ

0034.1522.PT

SCHURTER Inc.In Stock: 26960034.1522.PT Datasheet

DirectRFQ

0217004.MXEP

Littelfuse Inc.In Stock: 8580217004.MXEP Datasheet

DirectRFQ

BK/S500-V-4-R

Eaton - Electronics DivisionIn Stock: 704BK/S500-V-4-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5SFP 4-R are qualified based on the following criteria:

Electrical Parameters (Critical):

• Current Rating: 4 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 40A (exact match required)

Mechanical Parameters (Critical):

• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)

Environmental & Compliance Parameters:

• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
• RoHS Status: ROHS3 Compliant (minimum requirement)

All three substitute parts—0034.1522.PT (SCHURTER Inc.), 0217004.MXEP (Littelfuse Inc.), and BK/S500-V-4-R (Eaton - Electronics Division)—meet these criteria and are direct functional equivalents.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with confirmed inventory availability and meet the core electrical and mechanical requirements for direct replacement of the 5SFP 4-R.

0034.1522.PT (SCHURTER Inc.): Holds cURus certification and maintains ROHS3 compliance. Melting I²t value of 25.6 is closest to the original 5SFP 4-R specification of 26, indicating comparable thermal response characteristics.

0217004.MXEP (Littelfuse Inc.): Offers the broadest approval agency coverage (BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE) and highest inventory availability among substitutes. Melting I²t of 29.165 indicates slightly slower thermal response compared to the original part.

BK/S500-V-4-R (Eaton - Electronics Division): Maintains compliance certifications (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE) consistent with the original 5SFP 4-R. Melting I²t of 22 indicates faster thermal response. Operating temperature range not specified in available data.

Selection should be based on specific application requirements, regional certification needs, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can 0034.1522.PT be used as a direct replacement for 5SFP 4-R? A: Yes. Both parts share identical electrical ratings (4A, 250VAC), response time (Fast Blow), breaking capacity (40A), and package dimensions (5mm x 20mm). Both are ROHS3 compliant and rated for -55°C to 125°C operation.

Q: What is the significance of the Melting I²t parameter in fuse substitution? A: Melting I²t determines the thermal energy required to melt the fuse element. The 5SFP 4-R specifies 26, while substitutes range from 22 to 29.165. Variations within this range are acceptable for equivalent fast-blow cartridge fuses at the same current rating, as they reflect manufacturing tolerances and design variations across manufacturers.

Q: Are there dimensional differences between the substitute parts? A: Minor dimensional variations exist. The 5SFP 4-R measures 0.217" Dia x 0.827" L (5.50mm x 21.00mm). The 0034.1522.PT measures 0.213" Dia x 0.886" L (5.40mm x 22.50mm), and the 0217004.MXEP measures 0.228" Dia x 0.886" L (5.80mm x 22.50mm). These variations remain within the 5mm x 20mm nominal package specification and do not affect through-hole mounting compatibility.

Q: Which substitute part has the best certification coverage? A: The 0217004.MXEP (Littelfuse) carries the most comprehensive approval agency certifications: BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. This makes it suitable for applications requiring multi-regional compliance.

Q: Is DC Cold Resistance a critical parameter for substitution? A: DC Cold Resistance affects voltage drop during normal operation. The 5SFP 4-R specifies 0.017 Ohms, while substitutes range from 0.0165 to 0.021 Ohms. These variations are minimal and do not impact circuit protection function in standard applications.

Q: Can BK/S500-V-4-R be used if operating temperature range is not specified? A: The BK/S500-V-4-R meets all critical electrical and mechanical parameters. However, if your application requires confirmed operation across the full -55°C to 125°C range, the 5SFP 4-R, 0034.1522.PT, or 0217004.MXEP are preferred due to explicit temperature range documentation.