5SF 630 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5SF 630 is a 630 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure direct interchangeability in existing applications.

Key Parameters

Parameter	Value
Current Rating	630 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	35 A

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 630 is determined by strict equivalence across the following parameters:

Current Rating: 630 mA (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)
Breaking Capacity: 35 A (exact match required)

Parts are classified as Direct Manufacturer Substitutes when all parameters match exactly and are manufactured by the same or different OEM. Parts classified as Similar are included for reference but may have minor variations in secondary parameters such as melting I²t or DC cold resistance that do not affect primary electrical function within the specified ratings.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance (Ohms)	Product Status
5SF 630	Bel Fuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.64	0.19	Obsolete
5SF 630-R	Bel Fuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.64	0.152	Active
0217.630MXBP	Littelfuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.41	0.19	Active
0217.630MXP	Littelfuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.41	0.19	Active
0217.630TXP	Littelfuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.41	0.19	Active
0217.630VXP	Littelfuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.41	0.19	Active
0034.1514	SCHURTER Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.303	—	Active
0217.630HXP	Littelfuse Inc.	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.41	0.19	Active
GDB-630MA	Eaton - Electronics Division	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.35	0.2	Active
S500-630-R	Eaton - Electronics Division	630 mA	250 V	Fast Blow	5mm x 20mm	35 A	0.35	0.2	Active

Engineering Selection Recommendations

For applications requiring the 5SF 630, the following active-status alternatives are available:

Primary Direct Substitute: 5SF 630-R (Bel Fuse Inc.) maintains identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part is the direct replacement from the original manufacturer.

Littelfuse Series 217 Options: Parts 0217.630MXBP, 0217.630MXP, 0217.630TXP, 0217.630VXP, and 0217.630HXP are all active, ROHS3-compliant alternatives with identical primary ratings. These parts carry expanded approval certifications including CCC, CE, CSA, and UL. Melting I²t values (0.41) differ from the original part (0.64), indicating faster thermal response characteristics within the fast-blow classification.

SCHURTER FSF 5x20 Series: Part 0034.1514 is an active alternative with identical electrical ratings and ROHS3 compliance. This part carries cURus and VDE certifications. The melting I²t value (0.303) indicates the fastest thermal response among all listed alternatives.

Eaton Series Options: Parts GDB-630MA and S500-630-R are active alternatives with identical primary ratings. S500-630-R carries the broadest certification portfolio including BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE, with ROHS3 compliance.

All listed substitutes are mechanically and electrically compatible with the original 5SF 630 within the specified 5mm x 20mm holder requirement.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the 5SF 630?

A: Yes. All listed parts maintain identical current rating (630 mA), voltage rating (250 V AC), response time (fast blow), and mechanical form factor (5mm x 20mm). They are designed for use in the same holder type and are electrically interchangeable.

Q: What is the significance of different melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values indicate faster thermal response. All listed parts are classified as fast-blow fuses and operate within the 35 A breaking capacity specification. Variations in melting I²t do not affect compatibility with standard 5mm x 20mm holders or the primary 630 mA / 250 V rating.

Q: Why is the original 5SF 630 marked as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Bel Fuse Inc. Active alternatives from other manufacturers provide equivalent functionality and are recommended for new designs and ongoing maintenance.

Q: Are there any compliance differences between the substitutes?

A: Yes. The 5SF 630 is RoHS non-compliant. All active substitutes listed are ROHS3 compliant. Certification portfolios vary by manufacturer; S500-630-R carries the most comprehensive approval agency certifications (BSI, CCC, CSA, cURus, IMQ, SEMKO, VDE).

Q: Does the 5mm x 20mm package dimension apply to all substitutes?

A: Yes. All substitutes are specified with identical 5mm x 20mm dimensions and require the same holder type as the original 5SF 630.

Q: Can I substitute the 0034.1524 (6.3 A) for the 5SF 630 (630 mA)?

A: No. The 0034.1524 has a current rating of 6.3 A, which is ten times higher than the required 630 mA. This part is not electrically equivalent and would not provide the same circuit protection function.

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