5MF 100-R Equivalent & Substitute Parts

Part Overview

The 5MF 100-R is a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package format. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing fuse holder assemblies.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict compliance with the following parameters:

Current Rating: 100 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Configuration: Requires Holder (exact match required)

All substitute parts listed below meet these mandatory criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies do not affect functional substitutability within the specified electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status
5MF 100-R	Bel Fuse Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	200 A	0.0009	6.95	Obsolete
0235.100HXP	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.00312	8.4	Active
0034.1506	SCHURTER Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0014	—	Active
0034.1506.G	SCHURTER Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0014	—	Active
0217.100HXP	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0045	5.6965	Active
0217.100MXP	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0045	5.6965	Active
0235.100MXP	Littelfuse Inc.	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.00312	8.4	Active
BK/GDB-100MA	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.003	3.8	Active
BK/GMA-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0001	7.84	Active
BK/S500-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.003	3.8	Active
BK1/GMA-100-R	Eaton - Electronics Division	100 mA	250 V	5mm x 20mm	Fast Blow	35 A	0.0001	7.84	Active

Engineering Selection Recommendations

All listed substitute parts are active products with current manufacturing status, providing supply continuity for the obsolete 5MF 100-R. Selection should prioritize parts with the broadest approval agency coverage to ensure compliance with regional regulatory requirements.

Parts with comprehensive certifications include 0034.1506.G (CCC, CE, CSA, cURus, UKCA, UL, VDE) and 0217.100HXP (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE), offering maximum flexibility for global applications. Littelfuse 217 series parts (0217.100HXP, 0217.100MXP) maintain the highest inventory availability at 3017 and 5500 units respectively, supporting consistent procurement.

For applications requiring specific approval agencies, cross-reference the substitute part's certification list against system requirements before final selection.

Frequently Asked Questions (FAQ)

Q: Can I use any substitute part listed in the Parameter Comparison table as a direct replacement for the 5MF 100-R?

A: Yes. All listed parts meet the mandatory substitution criteria: 100 mA current rating, 250 V AC voltage rating, 5mm x 20mm package dimensions, fast-blow response, and cartridge glass fuse type. Physical installation in existing fuse holders is compatible.

Q: What is the significance of the different melting I²t values shown in the comparison table?

A: Melting I²t represents the thermal energy required to melt the fuse element. While values vary among substitutes, all parts maintain the same current rating and response time classification. The variation reflects different internal element designs but does not affect substitutability within the specified electrical parameters.

Q: Do all substitute parts have the same approval certifications as the original 5MF 100-R?

A: No. The original part carries CE, CSA, and cULus approvals. Substitute parts have varying certification profiles. Verify that your selected substitute meets the specific regulatory requirements for your application region before implementation.

Q: Why do some substitute parts show different DC cold resistance values?

A: DC cold resistance variation results from differences in element material composition and internal construction among manufacturers. This parameter does not affect fuse operation within the specified AC voltage and current ratings.

Q: Is the 5mm x 20mm package dimension critical for substitution?

A: Yes. The package dimension is critical. This fuse type requires a specific holder assembly. Any substitute must maintain exact 5mm x 20mm dimensions to ensure proper mechanical fit and electrical contact within the holder.

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