5SF 80-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5SF 80-R is an 80 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 substitute parts necessary for ongoing system maintenance and new design implementations. The fuse requires a compatible holder for installation and is designed for circuit protection applications requiring fast response characteristics.

Key Parameters

Parameter	Value
Current Rating	80 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 80-R is determined by strict equivalence across the following parameters:

Current Rating: 80 mA (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)
Breaking Capacity: 35A (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these criteria. Parts are categorized as Direct Manufacturer equivalents or Similar alternatives based on electrical parameter alignment and approval agency certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status
5SF 80-R	Bel Fuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.003	6.8	Obsolete
0034.1531	SCHURTER Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00102	Not Specified	Active
0217.080MXBP	Littelfuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00083	7.89	Active
0217.080MXP	Littelfuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00083	7.89	Active
0217.080TXP	Littelfuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00083	7.89	Active
0217.080VXP	Littelfuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00083	7.89	Active
0217.080HXP	Littelfuse Inc.	80	250	5mm x 20mm	Fast Blow	35	0.00083	7.89	Active
BK/S500-80-R	Eaton - Electronics Division	80	250	5mm x 20mm	Fast Blow	35	0.0012	5	Active
GDB-80MA	Eaton - Electronics Division	80	250	5mm x 20mm	Fast Blow	35	0.0012	5	Active

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 5SF 80-R across current rating, voltage rating, package dimensions, and response characteristics. Selection among active alternatives should prioritize parts with the broadest approval agency certifications for regulatory compliance requirements.

Littelfuse 217 series parts (0217.080MXBP, 0217.080MXP, 0217.080TXP, 0217.080VXP, 0217.080HXP) carry certifications including CCC, CE, CSA, SEMKO, UL, and VDE, providing comprehensive global compliance coverage. The SCHURTER 0034.1531 offers active product status with CCC, cURus, and VDE certifications. Eaton parts (BK/S500-80-R, GDB-80MA) maintain active status with ROHS3 compliance but do not specify approval agencies.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements equivalent to the original 5SF 80-R specification.

Frequently Asked Questions (FAQ)

Q: Can the 5SF 80-R be directly replaced with any of these substitute parts?

A: Yes. All listed parts meet the mandatory electrical and mechanical parameters: 80 mA current rating, 250 V AC voltage rating, 5mm x 20mm package, fast-blow response, and 35A breaking capacity. Physical dimensions and holder compatibility are identical.

Q: What is the difference between "Direct Manufacturer" and "Similar" substitute classifications?

A: Direct Manufacturer equivalents are parts explicitly listed in the 5SF 80-R substitution chain with confirmed cross-reference relationships. Similar alternatives meet all electrical and mechanical specifications but may have different approval agency certifications or resistance characteristics. Both categories are electrically and mechanically interchangeable.

Q: Do all substitute parts require the same holder as the 5SF 80-R?

A: Yes. All substitute parts are specified as 5mm x 20mm cartridge fuses requiring a holder. Existing 5mm x 20mm fuse holders are compatible with all listed alternatives.

Q: How do melting I²t values affect part selection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Variations in this parameter (ranging from 0.00083 to 0.003 in this list) reflect different fuse element designs. All parts maintain the same 80 mA current rating and fast-blow response, ensuring equivalent circuit protection performance.

Q: Which substitute part has the broadest global certification coverage?

A: Littelfuse 217 series parts carry the most comprehensive certifications, including CCC, CE, CSA, K-MARK or SEMKO, and UL, providing coverage across North American, European, and Asian regulatory requirements.

Q: Is the 5SF 80-R still available for purchase?

A: The 5SF 80-R is classified as obsolete. Active substitute parts with current inventory include all Littelfuse 217 series variants, SCHURTER 0034.1531, and Eaton S500 and GDB series parts.

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