Equivalent & Substitute Parts for 5SF 1 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5SF 1 is a 1 A, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This part is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, ensuring continued availability for replacement and new designs.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution for the 5SF 1 is determined by strict equivalence in the following parameters:

Current Rating: 1 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

Parts are classified into two categories:

Parametric Equivalents maintain all critical electrical and mechanical parameters with active product status and modern compliance certifications.

Direct Substitutes are functionally equivalent parts from alternative manufacturers that meet all specified parameters.

Similar Parts share the same electrical ratings and package but may have different breaking capacity or melting I²t characteristics; these are listed for reference only and require application-specific validation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
5SF 1	Bel Fuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.6	Obsolete	Non-compliant
5MF 1-R	Bel Fuse Inc.	1	250	5mm x 20mm	Fast Blow	200	0.88	Active	ROHS3 Compliant
5SF 1-R	Bel Fuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.6	Active	ROHS3 Compliant
0034.1516	SCHURTER Inc.	1	250	5mm x 20mm	Fast Blow	35	1.13	Active	ROHS3 Compliant
0217001.MXBP	Littelfuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.045	Active	ROHS3 Compliant
0217001.MXP	Littelfuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.045	Active	ROHS3 Compliant
0217001.TXP	Littelfuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.045	Active	ROHS3 Compliant
0217001.VXP	Littelfuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.045	Active	ROHS3 Compliant
0217001.HXP	Littelfuse Inc.	1	250	5mm x 20mm	Fast Blow	35	1.045	Active	ROHS3 Compliant
0235001.HXP	Littelfuse	1	250	5mm x 20mm	Fast Blow	100	0.4675	Active	ROHS3 Compliant
BK1/S500-1-R	Eaton - Electronics Division	1	250	5mm x 20mm	Fast Blow	35	0.6	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 5SF 1, the following parts are recommended based on product status and compliance:

Primary Recommendation: 5SF 1-R (Bel Fuse Inc.) maintains identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part preserves the original breaking capacity (35 A) and melting I²t (1.6), ensuring equivalent circuit protection characteristics.

Alternative from Bel Fuse: 5MF 1-R offers higher breaking capacity (200 A) and lower melting I²t (0.88) while maintaining all other parameters. This part is suitable for applications where enhanced breaking capacity is beneficial.

Cross-Manufacturer Alternatives: Parts from Littelfuse Inc. (0217001 series), SCHURTER Inc. (0034.1516), and Eaton (BK1/S500-1-R) meet all specified electrical and mechanical parameters with active product status and ROHS3 compliance. Selection among these alternatives depends on supply chain availability and existing design qualification.

Similar Parts for Reference: 0235001.HXP and 0217001.HXP differ in breaking capacity and melting I²t characteristics and are listed for informational purposes only.

Frequently Asked Questions (FAQ)

Q: Can 5MF 1-R be used as a direct replacement for 5SF 1?

A: 5MF 1-R is electrically and mechanically equivalent in current rating, voltage, package, and response time. However, it has higher breaking capacity (200 A vs. 35 A) and lower melting I²t (0.88 vs. 1.6). Application-specific validation is required to confirm suitability.

Q: What is the difference between the Littelfuse 0217001 variants (MXBP, MXP, TXP, VXP, HXP)?

A: All 0217001 variants share identical electrical specifications (1 A, 250 V, fast-blow, 5mm x 20mm). The suffix designations indicate different packaging or internal construction variants. All are functionally equivalent for the specified parameters.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed are ROHS3 compliant. The original 5SF 1 is RoHS non-compliant due to its obsolete status.

Q: Does package size vary among substitutes?

A: All substitute parts maintain the 5mm x 20mm package specification. Minor dimensional variations (e.g., 0.201" vs. 0.205" diameter) are within standard manufacturing tolerances and do not affect holder compatibility.

Q: Which substitute has the closest melting I²t to the original 5SF 1?

A: 5SF 1-R maintains identical melting I²t (1.6). Among cross-manufacturer alternatives, SCHURTER 0034.1516 (1.13) and Littelfuse 0217001 series (1.045) provide the closest values.

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