Equivalent & Substitute Parts for 5MT 1 Glass Cartridge Fuse

Part Overview

The 5MT 1 is a 1 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package format. This component is classified as obsolete, requiring identification of active equivalent parts for ongoing system support and procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 1 A (mandatory match)
Voltage Rating: 250 V AC (mandatory match)
Package / Case: 5mm x 20mm (mandatory match for holder compatibility)
Fuse Type: Cartridge, Glass (mandatory match)
Mounting Type: Requires Holder (mandatory match)

Response time classification (Medium Blow vs. Slow Blow) and breaking capacity variations are secondary parameters that may differ between substitutes depending on application requirements. All substitute parts listed maintain the core electrical and mechanical compatibility required for direct replacement in standard 5mm x 20mm fuse holders.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
5MT 1	Bel Fuse Inc.	1	250	Medium Blow	100	4.2	Obsolete	Non-compliant
0213001.MXP	Littelfuse Inc.	1	250	Slow Blow	35	19.2	Active	ROHS3 Compliant
0218001.MXP	Littelfuse Inc.	1	250	Slow Blow	35	6.73	Active	ROHS3 Compliant
0218001.TXP	Littelfuse Inc.	1	250	Slow Blow	35	6.73	Active	ROHS3 Compliant
0232001.MXP	Littelfuse Inc.	1	250	Medium Blow	100	1.373	Active	ROHS3 Compliant
0239001.HXP	Littelfuse Inc.	1	250	Slow Blow	35	11.295	Active	ROHS3 Compliant
20111000001	Littelfuse Inc.	1	250	Medium Blow	80	2	Active	ROHS3 Compliant
20111000021	Littelfuse Inc.	1	250	Medium Blow	80	2	Active	ROHS3 Compliant
BK1/GMD-1-R	Eaton - Electronics Division	1	250	Slow Blow	100	12	Active	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain mandatory electrical and mechanical compatibility with the 5MT 1. Selection should be based on the following criteria:

Medium Blow Response Time (Closest Match to Original):

0232001.MXP: Active status, ROHS3 compliant, 100 A breaking capacity, CE/KC/PSE approvals
20111000001 and 20111000021: Active status, ROHS3 compliant, 80 A breaking capacity, cULus approval

Slow Blow Response Time (Alternative Characteristic):

0218001.MXP and 0218001.TXP: Active status, ROHS3 compliant, 35 A breaking capacity, multiple international approvals (CCC, CE, CSA, UL, VDE)
0239001.HXP: Active status, ROHS3 compliant, 35 A breaking capacity, CE/CSA/KC/PSE/UL approvals
0213001.MXP: Active status, ROHS3 compliant, 35 A breaking capacity, extended approval agency coverage
BK1/GMD-1-R: Active status, ROHS3 compliant, 100 A breaking capacity, CSA/PSE/UL approvals

All substitute parts are RoHS3 compliant, addressing the non-compliant status of the original 5MT 1. Selection between Medium Blow and Slow Blow variants depends on circuit protection requirements and application-specific timing characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use a Slow Blow substitute in place of the Medium Blow 5MT 1?

A: Slow Blow and Medium Blow fuses have different response time characteristics. Slow Blow fuses tolerate temporary overcurrent conditions longer than Medium Blow fuses. Substitution is possible only if the application circuit design accommodates the extended response time. Verify circuit protection requirements before selection.

Q: Are all substitute parts compatible with existing 5mm x 20mm fuse holders?

A: Yes. All substitute parts maintain the 5mm x 20mm package specification and require the same holder type. Physical and electrical compatibility with standard holders is maintained across all listed substitutes.

Q: What is the difference between breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at rated voltage. The 5MT 1 has 100 A breaking capacity. Substitutes range from 35 A to 100 A. Selection should match or exceed the circuit's maximum available fault current.

Q: Why do melting I²t values differ between substitutes?

A: Melting I²t is a thermal characteristic that determines fuse response speed under overcurrent conditions. Lower I²t values indicate faster response. Differences reflect variations in fuse element design and response time classification. Application thermal protection requirements determine acceptable I²t ranges.

Q: Which substitute offers the best compliance coverage?

A: 0218001.MXP and 0218001.TXP provide the broadest international approval coverage (CCC, CE, CSA, K-MARK/KC, PSE, SEMKO, UL, VDE). These parts are suitable for global applications requiring multiple regional certifications.

Q: Is the 5MT 1 still available for procurement?

A: The 5MT 1 is classified as obsolete. Active substitutes from Littelfuse Inc. and Eaton are recommended for new designs and ongoing procurement to ensure supply chain continuity and compliance with current manufacturing standards.

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