5MT 5 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5MT 5 is a 5A 125VAC glass cartridge fuse manufactured by Bel Fuse Inc., designed for circuit protection in applications requiring a 5mm x 20mm form factor. This fuse operates with medium blow response characteristics and is rated for breaking capacity of 10kA at rated voltage. The product is currently obsolete, making identification of equivalent substitute parts essential for ongoing maintenance and repair applications where this fuse type is specified in original equipment designs.

Substiute Parts

5MT 5

Bel Fuse Inc.In Stock: 10405MT 5 Datasheet

Current PartRFQ

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 are qualified based on the following critical parameters that determine functional equivalence:

• Current Rating: 5 A (exact match required)
• Voltage Rating - AC: 125 V (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Medium Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 10kA (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The substitute parts listed below meet all these critical parameters and are therefore direct functional equivalents suitable for replacement in applications originally designed for the 5MT 5.

Parameter Comparison

Engineering Selection Recommendations

Both Littelfuse substitute parts (0232005.MX125P and 0233005.MXP) are active products with current manufacturing support, addressing the obsolescence status of the original 5MT 5. The 0233005.MXP offers the broadest regulatory approval coverage, including UL certification in addition to CE, CSA, KC, and PSE certifications. Both substitute parts are ROHS3 compliant, providing environmental compliance advantages over the original non-compliant part.

The dimensional variance between the original part (5.10mm diameter) and the substitute parts (5.20mm diameter) remains within acceptable tolerance for standard 5mm x 20mm fuse holders. All three parts share identical electrical ratings and breaking capacity specifications, ensuring functional equivalence in circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 0232005.MX125P or 0233005.MXP be used as direct replacements for the 5MT 5?

A: Yes. Both parts meet all critical electrical and mechanical parameters: 5A current rating, 125V AC voltage rating, 10kA breaking capacity, medium blow response, and 5mm x 20mm package dimensions. Both are compatible with standard fuse holders designed for this form factor.

Q: What is the difference between the two Littelfuse substitute parts?

A: The primary differences are melting I²t values (56.72 for 0232005.MX125P versus 89.975 for 0233005.MXP) and regulatory certifications. The 0233005.MXP includes UL certification and CSA approval, while the 0232005.MX125P includes KC approval. Both are ROHS3 compliant and active products.

Q: Are there dimensional compatibility concerns with the substitute parts?

A: The substitute parts have a slightly larger diameter (5.20mm versus 5.10mm for the original), but this difference is within standard tolerance for 5mm x 20mm fuse holder specifications. Physical fit in existing holders is not affected.

Q: Why is the original 5MT 5 listed as obsolete?

A: The 5MT 5 is no longer manufactured by Bel Fuse Inc. The listed substitute parts from Littelfuse are active products with ongoing production and support, making them the appropriate choice for new applications and replacements.

Q: Which substitute part should be selected for new designs?

A: Selection between 0232005.MX125P and 0233005.MXP depends on specific regulatory requirements. The 0233005.MXP is suitable for applications requiring UL certification. Both parts are functionally equivalent for standard circuit protection applications.