Equivalent & Substitute Parts for 5SF 250-R Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5SF 250-R is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in industrial and commercial applications. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility while meeting current availability and compliance requirements.

Key Parameters

Parameter	Value
Current Rating	250 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (250 mA), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), fuse type (cartridge glass), and mounting requirement (requires holder). All substitute parts listed meet these core electrical and mechanical criteria.

Direct substitutes are classified into two categories:

Direct Substitutes (Identical Electrical & Mechanical Specifications): Parts that match all key parameters and are functionally interchangeable without design modification. These include SCHURTER 0034.1510, Littelfuse 0217.250MXBP, 0217.250MXP, 0217.250TXP, 0217.250VXP, and Eaton BK/S500-250-R.

Similar Substitutes (Equivalent Function with Minor Variations): Parts that maintain electrical compatibility but differ in mounting configuration or series designation. These include SCHURTER 0034.1510.PT (through-hole variant), Littelfuse 0217.250HXP and 0235.250HXP, and Eaton S500-250-R.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
5SF 250-R	Bel Fuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.05	0.84	Obsolete
0034.1510	SCHURTER Inc.	250	250	Fast Blow	5mm x 20mm	35	0.0159	—	Active
0217.250MXBP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.04	1.2325	Active
0217.250MXP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.04	1.2325	Active
0217.250TXP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.04	1.2325	Active
0217.250VXP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.04	1.2325	Active
BK/S500-250-R	Eaton - Electronics Division	250	250	Fast Blow	5mm x 20mm	35	0.28	4.3	Active
0217.250HXP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.04	1.2325	Active
0235.250HXP	Littelfuse Inc.	250	250	Fast Blow	5mm x 20mm	35	0.0166	2.25	Active
S500-250-R	Eaton - Electronics Division	250	250	Fast Blow	5mm x 20mm	35	0.28	4.3	Active
0034.1510.PT	SCHURTER Inc.	250	250	Fast Blow	5mm x 20mm (Axial)	35	0.0159	—	Active

Engineering Selection Recommendations

All listed substitute parts are ROHS3 compliant and maintain the 35A breaking capacity and -55°C to 125°C operating temperature range of the original 5SF 250-R. Selection should prioritize active product status to ensure long-term availability and supply chain continuity.

Littelfuse 0217.250MXP, 0217.250TXP, 0217.250VXP, and 0217.250HXP offer the broadest regulatory approval coverage, including CCC, CE, CSA, K-MARK/KC, SEMKO, UL, and VDE certifications. SCHURTER 0034.1510 provides an alternative with active status and CCC, cURus, and VDE approvals. Eaton BK/S500-250-R and S500-250-R variants maintain BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE certifications.

The through-hole variant 0034.1510.PT differs in mounting configuration (axial through-hole versus cartridge requiring holder) and should be selected only when PCB-mounted fuse applications are required.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts as a direct replacement for the 5SF 250-R?

A: Yes, all direct substitute parts listed maintain identical current rating (250 mA), voltage rating (250 V AC), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (35A). Physical installation requires the same holder configuration as the original part.

Q: What is the difference between the Littelfuse 0217.250MXBP, 0217.250MXP, 0217.250TXP, 0217.250VXP, and 0217.250HXP variants?

A: All five Littelfuse variants share identical electrical specifications (250 mA, 250 V AC, fast blow, 35A breaking capacity, 0.04 Melting I²t, 1.2325 Ω DC cold resistance). Differences are designated by series suffix codes (MXBP, MXP, TXP, VXP, HXP) and may reflect internal construction or manufacturing process variations. All are functionally equivalent for circuit protection applications.

Q: Why does the Eaton BK/S500-250-R show a higher DC cold resistance (4.3 Ω) and Melting I²t (0.28) compared to other substitutes?

A: The Eaton S500 series exhibits different thermal and electrical characteristics while maintaining the same current and voltage ratings. These variations reflect different fuse element construction and response characteristics. Compatibility is determined by matching current rating, voltage rating, response time classification, and package dimensions, which are identical across all listed substitutes.

Q: Should I use the SCHURTER 0034.1510.PT through-hole variant?

A: The 0034.1510.PT is a through-hole axial-mounted variant with slightly larger dimensions (5.40mm diameter x 22.50mm length versus 5.20mm x 20.00mm). Use this variant only if your application requires PCB-mounted fuse installation. For cartridge holder applications, use the standard 0034.1510.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance restrictions.

Q: Which substitute offers the best regulatory approval coverage?

A: Littelfuse 0217.250MXP, 0217.250TXP, 0217.250VXP, and 0217.250HXP provide the most comprehensive certification coverage, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals, suitable for global market applications.

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