5MT 1-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5MT 1-R 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 alternatives for continued 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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), and mounting requirement (holder-based). Response time characteristics (medium blow vs. slow blow) and breaking capacity values define functional subcategories within the substitute pool.

Direct equivalents maintain identical response time (medium blow) and breaking capacity (100 A). Similar substitutes share core electrical and mechanical specifications but differ in response time or breaking capacity, requiring circuit-level compatibility verification.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status
5MT 1-R	Bel Fuse Inc.	1	250	Medium Blow	100	4.2	0.177	Obsolete
0234001.MXP	Littelfuse Inc.	1	250	Medium Blow	100	1.975	0.175	Active
0232001.MXP	Littelfuse Inc.	1	250	Medium Blow	100	1.373	0.0923	Active
20111000001	Littelfuse Inc.	1	250	Medium Blow	80	2	—	Active
20111000021	Littelfuse Inc.	1	250	Medium Blow	80	2	—	Active
0213001.MXP	Littelfuse Inc.	1	250	Slow Blow	35	19.2	0.1165	Active
0218001.MXP	Littelfuse Inc.	1	250	Slow Blow	35	6.73	0.0613	Active
0218001.TXP	Littelfuse Inc.	1	250	Slow Blow	35	6.73	0.0613	Active
0239001.HXP	Littelfuse Inc.	1	250	Slow Blow	35	11.295	0.2965	Active
BK1/GMD-1-R	Eaton - Electronics Division	1	250	Slow Blow	100	12	0.3065	Active

Engineering Selection Recommendations

Direct Equivalents (Medium Blow, 100 A Breaking Capacity):

0234001.MXP and 0232001.MXP are active Littelfuse products with identical electrical ratings and response characteristics to the 5MT 1-R. Both maintain 100 A breaking capacity and medium blow response time. 0234001.MXP carries broader approval agency coverage (CE, CSA, K-MARK, PSE, UL) compared to 0232001.MXP (CE, KC, PSE). Selection between these two depends on required certification scope for the target application.

Alternative Medium Blow Options (Reduced Breaking Capacity):

20111000001 and 20111000021 are Littelfuse Series 201 fuses with medium blow response but reduced breaking capacity (80 A vs. 100 A). These are suitable for applications where 80 A breaking capacity is sufficient. Both carry cULus certification and operate within -25°C to 70°C, a narrower temperature range than the original specification.

Slow Blow Alternatives:

0213001.MXP, 0218001.MXP, 0218001.TXP, 0239001.HXP, and BK1/GMD-1-R are slow blow variants with reduced breaking capacity (35 A, except BK1/GMD-1-R at 100 A). These are functionally distinct from the medium blow 5MT 1-R and require circuit compatibility verification before substitution.

Compliance Considerations:

All active substitutes maintain ROHS3 compliance and REACH unaffected status. Approval agency certifications vary; applications requiring specific regional certifications (K-MARK, KC, UL, CSA, PSE) should reference the certification matrix in the parameter comparison table.

Frequently Asked Questions (FAQ)

Q: Can 0234001.MXP directly replace 5MT 1-R without circuit modification?

A: Yes. 0234001.MXP matches the 5MT 1-R across all critical parameters: 1 A current rating, 250 V AC voltage, medium blow response time, 100 A breaking capacity, and 5mm x 20mm package dimensions. Both require the same holder type. Mechanical and electrical compatibility is confirmed.

Q: What is the difference between medium blow and slow blow fuses?

A: Response time defines the fuse's thermal response to overcurrent. Medium blow fuses (5MT 1-R, 0234001.MXP, 0232001.MXP) tolerate brief inrush currents before melting. Slow blow fuses (0213001.MXP, 0218001.MXP, 0239001.HXP) withstand longer overcurrent durations. Substituting a slow blow fuse for a medium blow application may delay fault protection; substituting medium blow for slow blow may cause nuisance trips during normal inrush events.

Q: Why do some substitutes have lower breaking capacity (35 A vs. 100 A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt without rupturing the cartridge. Lower breaking capacity fuses are suitable for circuits with inherently limited fault current. Applications with higher available fault current require fuses with matching or higher breaking capacity to ensure safe operation.

Q: Are all substitutes available in the same packaging format?

A: Yes. All listed substitutes are 5mm x 20mm glass cartridge fuses requiring a holder. Mechanical fit and holder compatibility are identical across all alternatives.

Q: Which substitute has the broadest international certification coverage?

A: 0218001.TXP carries the most comprehensive approval agency list (CCC, CE, CSA, KC, PSE, SEMKO, UL, VDE), making it suitable for applications requiring multi-regional compliance. However, it is a slow blow variant and requires circuit compatibility verification.

Q: What is the operating temperature range consideration for substitution?

A: The 5MT 1-R operates from -55°C to 125°C. Most Littelfuse substitutes (0234001.MXP, 0232001.MXP, 0213001.MXP, 0218001.MXP, 0218001.TXP, 0239001.HXP) maintain this full range. Series 201 fuses (20111000001, 20111000021) operate within -25°C to 70°C, a narrower range. Applications requiring full -55°C to 125°C operation should avoid Series 201 alternatives.

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