Equivalent & Substitute Parts for 5MT 5-R Fuse Cartridge

Part Overview

The Bel Fuse Inc. 5MT 5-R is a 5A 125VAC glass cartridge fuse in 5mm x 20mm form factor, designed for applications requiring medium-blow response characteristics. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component procurement.

Substiute Parts

5MT 5-R

Bel Fuse Inc.In Stock: 7875MT 5-R Datasheet

Current PartRFQ

0234005.MXP

Littelfuse Inc.In Stock: 76000234005.MXP Datasheet

DirectRFQ

0232005.MX125P

Littelfuse Inc.In Stock: 11320232005.MX125P Datasheet

SimilarRFQ

0233005.MXP

LittelfuseIn Stock: 19010233005.MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5MT 5-R are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Current Rating: 5 A (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Response Time: Medium Blow (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Compatibility Criteria:

• Voltage Rating (AC): 125 V minimum
• Fuse Type: Cartridge (Glass or Ceramic acceptable)
• RoHS Compliance: ROHS3 Compliant

The 5MT 5-R has three identified substitutes from Littelfuse Inc., all meeting the primary matching criteria. Two substitutes (0232005.MX125P and 0233005.MXP) are glass cartridge fuses with identical voltage ratings. One substitute (0234005.MXP) is a ceramic cartridge fuse with elevated voltage rating (250VAC), suitable for applications where higher voltage margin is acceptable.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Glass Cartridge, 125VAC):

The Littelfuse 0232005.MX125P and 0233005.MXP are direct functional equivalents to the 5MT 5-R. Both are active products with identical electrical ratings and form factors. Selection between these two glass cartridge options depends on application-specific requirements for melting I²t characteristics and DC cold resistance values. Both carry broader regulatory approvals (CE, CSA, KC, PSE, UL for 0233005.MXP; CE, KC, PSE for 0232005.MX125P) compared to the obsolete original part.

Alternative Substitute (Ceramic Cartridge, 250VAC):

The Littelfuse 0234005.MXP is a ceramic cartridge fuse with elevated voltage rating (250VAC). This part is suitable for applications where higher voltage margin is required or where ceramic fuse characteristics are preferred. The ceramic construction provides different breaking capacity (200A vs. 10kA) and melting I²t characteristics (20.645 vs. 56.72–89.975). This substitute is appropriate only when system design permits the voltage rating upgrade and ceramic fuse behavior is compatible with circuit protection requirements.

All substitute parts are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the 0234005.MXP ceramic fuse replace the 5MT 5-R in any application?

A: The 0234005.MXP meets all primary matching criteria (5A current, 5mm x 20mm package, medium-blow response, operating temperature range). However, it differs in fuse material (ceramic vs. glass) and voltage rating (250VAC vs. 125VAC). Substitution is valid only when the application circuit design permits ceramic fuse characteristics and the higher voltage rating does not conflict with system specifications.

Q: What is the difference between the two glass cartridge substitutes (0232005.MX125P and 0233005.MXP)?

A: Both are glass cartridge fuses with identical current, voltage, and package specifications. They differ in melting I²t values (56.72 vs. 89.975) and DC cold resistance (0.0134 vs. 0.0217 Ohms). The 0233005.MXP carries additional regulatory approvals (CSA, UL). Selection depends on whether the application requires specific I²t or resistance characteristics.

Q: Why is the original 5MT 5-R classified as obsolete?

A: The 5MT 5-R is marked obsolete by the manufacturer. Littelfuse equivalents (0232005.MX125P and 0233005.MXP) are active products with identical specifications, making them the recommended alternatives for new designs and ongoing component procurement.

Q: Are all substitute parts compatible with the same fuse holder as the 5MT 5-R?

A: All substitute parts use the 5mm x 20mm cartridge form factor and require a holder, matching the original part's mounting requirements. Physical compatibility with existing fuse holders is confirmed by identical package dimensions.

Q: Do the substitute parts meet the same regulatory approvals as the original?

A: The substitute parts meet or exceed the original part's regulatory requirements. The 0233005.MXP carries CE, CSA, K-MARK, PSE, and UL approvals, providing broader compliance coverage than the original 5MT 5-R (CE, CSA, cURus, PSE).