5MT 100 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5MT 100 is a 100 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse requires a dedicated holder for installation and provides medium-blow response characteristics suitable for general circuit protection applications.

Substiute Parts

5MT 100

Bel Fuse Inc.In Stock: 9775MT 100 Datasheet

Current PartRFQ

20101000001

LittelfuseIn Stock: 87920101000001 Datasheet

SimilarRFQ

20101000021

Littelfuse Inc.In Stock: 105620101000021 Datasheet

SimilarRFQ

BK1/GMC-100-R

Eaton - Electronics DivisionIn Stock: 770BK1/GMC-100-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MT 100 is determined by strict equivalence across the following parameters:

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

All identified substitute parts meet these core electrical and mechanical criteria. Variations in secondary parameters such as breaking capacity, melting I²t, operating temperature range, and approval agencies do not disqualify substitution but may influence selection based on application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (20101000001, 20101000021, and BK1/GMC-100-R) are electrically and mechanically equivalent to the 5MT 100 and are suitable for direct replacement in holder-based installations.

For applications requiring RoHS3 compliance, select from Littelfuse 20101000001, Littelfuse 20101000021, or Eaton BK1/GMC-100-R, as the original 5MT 100 is non-compliant.

For applications operating within the -25°C to 70°C temperature range, Littelfuse parts 20101000001 and 20101000021 are appropriate. The Eaton BK1/GMC-100-R does not specify an operating temperature range.

For applications requiring higher breaking capacity (80 A), select Littelfuse 20101000001 or 20101000021. The original 5MT 100 and Eaton BK1/GMC-100-R both provide 35 A breaking capacity.

All substitute parts carry active product status, ensuring ongoing availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 20101000001 or 20101000021 directly replace the 5MT 100?

A: Yes. Both Littelfuse parts are electrically and mechanically equivalent. They share identical current rating (100 mA), voltage rating (250 V), fuse type (cartridge, glass), package dimensions (5mm x 20mm), and response time (medium blow). Both require the same holder type.

Q: What is the difference between Littelfuse 20101000001 and 20101000021?

A: Both parts are electrically and mechanically identical. They share the same current rating, voltage rating, package dimensions, breaking capacity, melting I²t, operating temperature range, and RoHS compliance status. Selection between them is based on packaging preference (both available in bulk) and inventory availability.

Q: Can the Eaton BK1/GMC-100-R replace the 5MT 100?

A: Yes. The Eaton part meets all core substitution criteria: 100 mA current rating, 250 V voltage rating, cartridge glass fuse type, 5mm x 20mm package, medium-blow response, and holder-based mounting. It is RoHS3 compliant and carries active product status.

Q: Are there differences in breaking capacity between the substitute parts?

A: Yes. The Littelfuse 20101000001 and 20101000021 provide 80 A breaking capacity, while the original 5MT 100 and Eaton BK1/GMC-100-R provide 35 A. Higher breaking capacity does not affect substitution eligibility but may be advantageous in applications with higher fault current levels.

Q: Which substitute part has the widest operating temperature range?

A: The original 5MT 100 operates from -55°C to 125°C. The Littelfuse 20101000001 and 20101000021 operate from -25°C to 70°C. The Eaton BK1/GMC-100-R does not specify an operating temperature range. For applications requiring extended low-temperature operation below -25°C, the original 5MT 100 specifications should be reviewed against application requirements.

Q: Are all substitute parts RoHS compliant?

A: The Littelfuse 20101000001, Littelfuse 20101000021, and Eaton BK1/GMC-100-R are all ROHS3 compliant. The original 5MT 100 is RoHS non-compliant. For new designs or applications with RoHS compliance requirements, any of the three substitute parts are suitable.

Q: What approval agencies certify each part?

A: The 5MT 100 carries CE, CSA, and cULus approvals. The Littelfuse 20101000001 and 20101000021 carry cULus approval. The Eaton BK1/GMC-100-R carries CSA, KC, MITI, and UL approvals. Application-specific regulatory requirements should determine final part selection.