Equivalent & Substitute Parts for 5MT 4 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5MT 4 is a 4A 125VAC glass cartridge fuse with a 5mm x 20mm form factor, designed for medium-blow response applications. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. The fuse requires a compatible holder for installation and operates across a temperature range of -55°C to 125°C.

Substiute Parts

5MT 4

Bel Fuse Inc.In Stock: 11835MT 4 Datasheet

Current PartRFQ

0233004.MXP

Littelfuse Inc.In Stock: 51190233004.MXP Datasheet

SimilarRFQ

0239004.HXP

Littelfuse Inc.In Stock: 68920239004.HXP Datasheet

SimilarRFQ

BK1/GMC-4-R

Eaton - Electronics DivisionIn Stock: 766BK1/GMC-4-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5MT 4 is determined by strict alignment with the following parameters:

• Current Rating: 4 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)
• Mounting Type: Requires Holder (exact match required)
• Breaking Capacity @ Rated Voltage: 10kA (exact match required)

All identified substitutes meet these core electrical and mechanical requirements. Response time characteristics (Medium Blow vs. Slow Blow) and resistance values vary among substitutes and must be evaluated based on circuit-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the mandatory electrical and mechanical specifications for direct replacement of the 5MT 4. Selection should be based on the following criteria:

0233004.MXP (Littelfuse 233 Series): Active product status with medium-blow response matching the original part. Offers ROHS3 compliance and expanded approval certifications including UL and KC. Suitable for applications requiring medium-blow characteristics with modern regulatory compliance.

0239004.HXP (Littelfuse 239 Series): Active product status with slow-blow response. Appropriate for circuits requiring extended response time and inrush current tolerance. ROHS3 compliant with comprehensive approval certifications. Melting I²t value of 270.703 indicates significantly delayed response compared to the original part.

BK1/GMC-4-R (Eaton GMC Series): Active product status with medium-blow response. ROHS3 compliant with CSA, KC, MITI, and UL approvals. Lowest DC cold resistance at 0.019 Ohms and lowest melting I²t at 36, indicating fastest response among the substitutes.

Frequently Asked Questions (FAQ)

Q: Can the 0239004.HXP substitute for the 5MT 4 in all applications?

A: The 0239004.HXP meets all mandatory electrical and mechanical parameters but features slow-blow response versus the original medium-blow characteristic. It is suitable only for applications where slow-blow behavior is acceptable or beneficial for inrush current handling.

Q: What is the significance of the melting I²t values in the parameter comparison?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Lower values result in faster response times. The BK1/GMC-4-R (36) responds fastest, followed by 0233004.MXP (51.61), while 0239004.HXP (270.703) provides the slowest response. Selection depends on circuit protection requirements.

Q: Are all substitutes physically compatible with existing fuse holders?

A: All substitutes maintain the 5mm x 20mm form factor and require a compatible holder, identical to the original 5MT 4. Physical compatibility is assured; however, verify that the holder is rated for the selected fuse's electrical characteristics.

Q: Which substitute offers the best regulatory compliance for new designs?

A: All three substitutes are ROHS3 compliant. The 0233004.MXP and 0239004.HXP offer the broadest approval certifications (CE, CSA, KC, PSE, UL), making them suitable for global market applications.

Q: How do DC cold resistance values affect circuit performance?

A: DC cold resistance affects voltage drop across the fuse during normal operation. The BK1/GMC-4-R exhibits the lowest resistance (0.019 Ohms), minimizing voltage drop, while the 0239004.HXP exhibits the highest (0.0312 Ohms). For low-voltage or high-current circuits, lower resistance values are preferable.