Littelfuse 0239003.MXEP Glass Cartridge Fuse 3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239003.MXEP is a 3A 250VAC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 5mm x 20mm form factor. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when applications require alternative sourcing due to inventory constraints, supply chain considerations, or manufacturer preference while maintaining identical electrical and mechanical specifications.

Substiute Parts

0239003.MXEP

Littelfuse Inc.In Stock: 10590239003.MXEP Datasheet

Current PartRFQ

0239003.HXEP

Littelfuse Inc.In Stock: 10460239003.HXEP Datasheet

DirectRFQ

5TTP 3-R

Bel Fuse Inc.In Stock: 14355TTP 3-R Datasheet

DirectRFQ

BK/GMD-V-3-R

Eaton - Electronics DivisionIn Stock: 792BK/GMD-V-3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0239003.MXEP are qualified based on the following mandatory parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 100A (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, and dimensional tolerances remain within acceptable engineering ranges for this product category.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed—0239003.MXEP, 0239003.HXEP, 5TTP 3-R, and BK/GMD-V-3-R—are Active product status and meet the core electrical and mechanical requirements for direct substitution in 3A 250VAC slow-blow fuse applications with 5mm x 20mm through-hole mounting.

The 0239003.HXEP (Littelfuse) is a direct manufacturer equivalent to the 0239003.MXEP, sharing identical electrical characteristics and dimensional specifications. Both parts carry the same approval agencies (CE, CSA, KC, PSE, UL) and melting I²t value of 129.51.

The 5TTP 3-R (Bel Fuse) and BK/GMD-V-3-R (Eaton) are qualified cross-manufacturer substitutes. Both maintain the required current, voltage, response time, and package specifications. Dimensional variations are within acceptable tolerances for through-hole mounting. The 5TTP 3-R carries CSA, CE, cULus, and PSE certifications. The BK/GMD-V-3-R carries CSA, PSE/JET, and UL certifications. Selection between these alternatives may be based on supply availability, inventory status, or established supplier relationships.

Frequently Asked Questions (FAQ)

Q: Can 0239003.HXEP be used as a direct replacement for 0239003.MXEP?

A: Yes. Both parts are manufactured by Littelfuse Inc., carry identical electrical specifications (3A, 250VAC, slow-blow), and share the same melting I²t value of 129.51 and DC cold resistance of 0.04877 Ohms. They are functionally equivalent.

Q: What are the key differences between the Littelfuse parts and the cross-manufacturer substitutes?

A: The Littelfuse 0239003.MXEP and 0239003.HXEP share identical melting I²t (129.51) and DC cold resistance (0.04877 Ohms). The 5TTP 3-R (Bel Fuse) has a lower melting I²t of 55.6 and DC cold resistance of 0.043 Ohms. The BK/GMD-V-3-R (Eaton) has a higher melting I²t of 145 and DC cold resistance of 0.0655 Ohms. All parts meet the 100A breaking capacity requirement and maintain compatibility with the 5mm x 20mm through-hole package.

Q: Are there approval agency differences between these parts?

A: The Littelfuse parts (0239003.MXEP and 0239003.HXEP) carry CE, CSA, KC, PSE, and UL approvals. The 5TTP 3-R carries CE, CSA, cULus, and PSE approvals. The BK/GMD-V-3-R carries CSA, PSE/JET, and UL approvals. Selection should align with regional compliance requirements for the end application.

Q: Do dimensional tolerances affect interchangeability?

A: All parts are specified for 5mm x 20mm (Axial) package mounting. Dimensional variations (0239003.MXEP: 5.50mm x 21.50mm; 5TTP 3-R: 5.50mm x 21.00mm; BK/GMD-V-3-R: 5.54mm x 21.10mm) remain within acceptable tolerances for standard through-hole fuse holders and do not affect mechanical interchangeability.

Q: Which part should be selected for new designs?

A: Selection is based on supply availability, approval agency requirements, and established supplier relationships. All four parts meet the core electrical and mechanical specifications for 3A 250VAC slow-blow fuse applications in 5mm x 20mm through-hole mounting.