Equivalent & Substitute Parts for 5SF 2 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5SF 2 is a 2 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 necessary to maintain circuit protection functionality in applications where the original 5SF 2 is no longer available. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and response characteristics to ensure proper circuit protection without modification to fuse holders or circuit design.

Key Parameters

Parameter	Value
Current Rating	2 A
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	35 A (primary specification)
Operating Temperature Range	-55°C to 125°C

Substitute Part Grouping Explanation

Substitution is determined by strict equivalence in the following parameters:

Current Rating: 2 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

Parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical and mechanical specifications, including breaking capacity of 35 A at rated voltage. These parts are direct replacements.

Parametric Equivalents: Parts meeting all core electrical and mechanical requirements but with different breaking capacity ratings. These parts function identically in circuit protection but may differ in fault current handling capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
5SF 2	Bel Fuse Inc.	2	250	Fast Blow	5x20mm	35	6.4	Obsolete	Non-compliant
5SF 2-R	Bel Fuse Inc.	2	250	Fast Blow	5x20mm	35	6.4	Active	ROHS3 Compliant
5MF 2-R	Bel Fuse Inc.	2	250	Fast Blow	5x20mm	200	4.4	Active	ROHS3 Compliant
0034.1519	SCHURTER Inc.	2	250	Fast Blow	5x20mm	35	5.28	Active	ROHS3 Compliant
0217002.MXBP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	35	5.73	Active	ROHS3 Compliant
0217002.MXP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	35	5.73	Active	ROHS3 Compliant
0217002.TXP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	35	5.73	Active	ROHS3 Compliant
0217002.VXP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	35	5.73	Active	ROHS3 Compliant
0217002.HXP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	35	5.73	Active	ROHS3 Compliant
0235002.HXP	Littelfuse Inc.	2	250	Fast Blow	5x20mm	100	2.645	Active	ROHS3 Compliant
BK1/S500-2-R	Eaton - Electronics Division	2	250	Fast Blow	5x20mm	35	4.2	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: 5SF 2-R (Bel Fuse Inc.)

The 5SF 2-R is the direct equivalent of the obsolete 5SF 2. It maintains identical electrical specifications, breaking capacity, and melting I²t characteristics. The part is in active production status with ROHS3 compliance. Inventory availability is substantial at 41,701 pieces. This part requires no circuit design modification and provides the most direct replacement path.

Alternative Direct Equivalents: 0217002.MXBP, 0217002.MXP, 0217002.TXP, 0217002.VXP, 0217002.HXP (Littelfuse Inc.), 0034.1519 (SCHURTER Inc.), and BK1/S500-2-R (Eaton - Electronics Division)

All listed alternatives maintain the 35 A breaking capacity specification and are in active production with ROHS3 compliance. These parts are electrically and mechanically equivalent and require no circuit modification. Selection among these alternatives may be based on supply chain availability, lead time, or existing supplier relationships.

Parametric Equivalent: 5MF 2-R (Bel Fuse Inc.)

The 5MF 2-R meets all core electrical and mechanical requirements but features a higher breaking capacity of 200 A at rated voltage compared to the 35 A specification of the original 5SF 2. The melting I²t is lower at 4.4 versus 6.4. This part is suitable for applications where higher fault current withstand capability is beneficial or required by circuit design. Verify circuit requirements before selection.

Parametric Equivalent: 0235002.HXP (Littelfuse Inc.)

The 0235002.HXP meets all core electrical and mechanical requirements but features a higher breaking capacity of 100 A at rated voltage. The melting I²t is significantly lower at 2.645 versus 6.4. This part is suitable for applications where higher fault current withstand capability is beneficial. Verify circuit requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can I use 5SF 2-R as a direct replacement for the obsolete 5SF 2?

A: Yes. The 5SF 2-R is electrically and mechanically identical to the 5SF 2, with identical current rating, voltage rating, response time, package dimensions, and breaking capacity. No circuit modification is required.

Q: What is the difference between direct equivalents and parametric equivalents?

A: Direct equivalents maintain the 35 A breaking capacity specification of the original 5SF 2. Parametric equivalents (5MF 2-R and 0235002.HXP) meet all core electrical and mechanical requirements but feature higher breaking capacity ratings. Selection depends on circuit fault current requirements.

Q: Are all substitute parts compatible with existing 5x20mm fuse holders?

A: Yes. All listed substitute parts maintain the 5mm x 20mm package dimension and are designed for standard 5x20mm fuse holders. No holder modification is required.

Q: What is the significance of RoHS compliance for substitute selection?

A: The original 5SF 2 is RoHS non-compliant. All listed substitute parts are ROHS3 compliant, meeting current environmental and regulatory requirements for new equipment designs and procurement.

Q: How do melting I²t values affect fuse selection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent conditions. Substitute parts with different melting I²t values (such as 5MF 2-R at 4.4 or 0235002.HXP at 2.645) provide different thermal response characteristics. Verify that circuit protection coordination requirements are maintained with alternative melting I²t values.

Q: Which substitute part has the highest inventory availability?

A: The 5SF 2-R (Bel Fuse Inc.) has the highest inventory at 41,701 pieces in stock, followed by 0217002.MXP (Littelfuse Inc.) at 30,200 pieces.

Q: Can I mix different substitute parts in the same circuit or equipment?

A: All listed substitute parts are electrically and mechanically equivalent and can be used interchangeably. However, for consistency in circuit protection coordination and maintenance procedures, using a single part number across identical circuit positions is recommended.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message