Bel Fuse Inc. 5MF 250 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5MF 250 is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse in a 5mm x 20mm form factor. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The fuse requires a holder for installation and is designed for applications requiring fast response time protection in the 250 mA current range.

Key Parameters

Parameter	Value
Current Rating	250 mA
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
Breaking Capacity @ Rated Voltage	200A

Substitute Part Grouping Explanation

Substitution for the 5MF 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)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not preclude substitution when the above parameters are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Fuse Type	Package / Case	Response Time	Mounting Type	Operating Temperature	Product Status	RoHS Status
5MF 250	Bel Fuse Inc.	250	250	Cartridge, Glass	5mm x 20mm	Fast Blow	Requires Holder	-55°C ~ 125°C	Obsolete	RoHS non-compliant
0034.1510	SCHURTER Inc.	250	250	Cartridge, Glass	5mm x 20mm	Fast Blow	Requires Holder	-55°C ~ 125°C	Active	ROHS3 Compliant
0034.1510.PT	SCHURTER Inc.	250	250	Cartridge, Glass	5mm x 20mm (Axial)	Fast Blow	Through Hole	-55°C ~ 125°C	Active	ROHS3 Compliant
0217.250HXP	Littelfuse Inc.	250	250	Cartridge, Glass	5mm x 20mm	Fast Blow	Requires Holder	-55°C ~ 125°C	Active	ROHS3 Compliant
0235.250HXP	Littelfuse Inc.	250	250	Cartridge, Glass	5mm x 20mm	Fast Blow	Requires Holder	-55°C ~ 125°C	Active	ROHS3 Compliant
S500-250-R	Eaton - Electronics Division	250	250	Cartridge, Glass	5mm x 20mm	Fast Blow	Requires Holder	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

The 5MF 250 is obsolete; direct replacements from active product lines are available. Selection among substitute parts should consider:

Product Status: All substitute parts are in active production status, ensuring long-term availability and supply chain stability compared to the obsolete 5MF 250.

Regulatory Compliance: The original 5MF 250 is RoHS non-compliant. All substitute parts (0034.1510, 0034.1510.PT, 0217.250HXP, 0235.250HXP, and S500-250-R) are ROHS3 compliant, meeting current environmental and regulatory requirements.

Approval Agencies: Substitute parts carry multiple international certifications (CE, CSA, UL, VDE, cURus, CCC, K-MARK, SEMKO, KC, BSI, IMQ). The original 5MF 250 carries CE, CSA, and UL certifications. Verify that the selected substitute meets the specific approval requirements for your application region and end-use industry.

Mounting Consideration: The 0034.1510.PT variant differs in mounting type (Through Hole vs. Requires Holder) and physical dimensions (5.40mm x 22.50mm vs. 5.10mm x 20.00mm). This part is suitable only if your design accommodates axial through-hole mounting. For direct mechanical replacement, use 0034.1510, 0217.250HXP, 0235.250HXP, or S500-250-R.

Inventory Availability: All substitute parts are in stock. SCHURTER 0034.1510.PT offers the highest inventory level (3,728 pcs), followed by Littelfuse 0217.250HXP (2,215 pcs).

Frequently Asked Questions (FAQ)

Q: Can I use 0034.1510.PT as a direct replacement for 5MF 250?

A: No. The 0034.1510.PT has a different mounting type (Through Hole vs. Requires Holder) and different physical dimensions (5.40mm x 22.50mm vs. 5.10mm x 20.00mm). It is not a direct mechanical replacement. Use 0034.1510 instead for identical mounting and form factor.

Q: What is the difference between 0034.1510 and 0034.1510.PT?

A: Both are SCHURTER FSF 5x20 series fuses with identical electrical ratings (250 mA, 250 V AC, fast-blow). The 0034.1510 requires a holder for installation, while 0034.1510.PT is designed for through-hole axial mounting on PCBs. Physical dimensions also differ: 0034.1510 is 5.20mm x 20.00mm; 0034.1510.PT is 5.40mm x 22.50mm.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed (0034.1510, 0034.1510.PT, 0217.250HXP, 0235.250HXP, and S500-250-R) are ROHS3 compliant. The original 5MF 250 is RoHS non-compliant.

Q: Do all substitute parts have the same breaking capacity as the original 5MF 250?

A: No. The original 5MF 250 has a breaking capacity of 200A at rated voltage. Substitute parts from SCHURTER, Littelfuse, and Eaton have breaking capacities of 35A. Breaking capacity differences do not affect substitution eligibility when all other electrical and mechanical parameters match.

Q: Which substitute part has the lowest DC cold resistance?

A: Littelfuse 0217.250HXP has a DC cold resistance of 1.2325 Ohms, the lowest among all parts listed. The original 5MF 250 has 2.4 Ohms; other substitutes range from 2.25 to 4.3 Ohms.

Q: Can I substitute based on melting I²t values?

A: Melting I²t is not a substitution criterion for this product category. All parts listed meet the core electrical and mechanical parameters required for substitution. Melting I²t variations (ranging from 0.014 to 0.28) reflect design differences between manufacturers but do not preclude functional equivalence in applications requiring 250 mA, 250 V AC/DC fast-blow protection.

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