Littelfuse 0239.750MXP Glass Cartridge Fuse 750mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239.750MXP is an active-status glass cartridge fuse rated for 750 mA at 250 V AC/DC with slow-blow response characteristics. This fuse is designed for applications requiring overcurrent protection in 5mm x 20mm form factor holders. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and regulatory approvals to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	750 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, KC, UL

Substitute Part Grouping Explanation

Substitution eligibility for the 0239.750MXP is determined by the following critical parameters:

Current Rating: 750 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and operating temperature ranges are noted but do not preclude substitution when the primary parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (Amps)	Voltage Rating - AC	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Operating Temperature	Approval Agency	RoHS Status
0239.750MXP	Littelfuse Inc.	750 mA	250 V	Slow Blow	5mm x 20mm	35A	5.425	0.471	-55°C ~ 125°C	CE, CSA, KC, UL	ROHS3 Compliant
0239.750TXP	Littelfuse Inc.	750 mA	250 V	Slow Blow	5mm x 20mm	35A	5.425	0.471	-55°C ~ 125°C	CE, CSA, KC, UL	ROHS3 Compliant
5TT 750-R	Bel Fuse Inc.	750 mA	250 V	Slow Blow	5mm x 20mm	100A	5.25	0.492	-55°C ~ 125°C	CE, CSA, cULus	ROHS3 Compliant
0034.3773	SCHURTER Inc.	750 mA	250 V	Slow Blow	5mm x 20mm	35A	5.54	—	-40°C ~ 85°C	cULus	ROHS3 Compliant
BK/GMD-750-R	Eaton - Electronics Division	750 mA	250 V	Slow Blow	5mm x 20mm	35A	4.7	0.4425	—	CSA, UL	ROHS3 Compliant
BK1/GMD-750-R	Eaton - Electronics Division	750 mA	250 V	Slow Blow	5mm x 20mm	35A	4.7	0.4425	—	CSA, UL	ROHS3 Compliant
TSC-750MA	OptiFuse	750 mA	250 V	Slow Blow	5mm x 20mm	100A	0.835	—	-55°C ~ 125°C	cULus, UL 248	ROHS3 Compliant

Engineering Selection Recommendations

All substitute parts listed maintain active product status and ROHS3 compliance. Selection among equivalents should be based on regulatory approval alignment with the target application:

For applications requiring CE, CSA, KC, and UL certifications, the Littelfuse 0239.750TXP provides parametric equivalence with identical electrical characteristics and approval scope.
For applications requiring extended breaking capacity (100A), the Bel Fuse 5TT 750-R and OptiFuse TSC-750MA both provide higher fault current ratings while maintaining core electrical parameters.
For applications with operating temperature constraints between -40°C and 85°C, the SCHURTER 0034.3773 is suitable with cULus certification.
For applications requiring CSA and UL certifications, the Eaton GMD series (BK/GMD-750-R and BK1/GMD-750-R) provide equivalent protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0239.750MXP be directly replaced with any of these substitute parts?

A: Yes, all listed parts are direct substitutes based on matching current rating (750 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm). Physical installation in existing holders is compatible.

Q: What is the difference between the 0239.750MXP and 0239.750TXP?

A: Both are Littelfuse products with identical electrical ratings, response characteristics, and approval certifications. They are parametric equivalents suitable for direct substitution.

Q: Why do some substitute parts have higher breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Higher ratings (100A vs. 35A) provide additional safety margin in high-fault-current applications but do not affect normal operation at the 750 mA rated current.

Q: Are there operating temperature differences I should consider?

A: The 0239.750MXP operates across -55°C to 125°C. The SCHURTER 0034.3773 has a narrower range (-40°C to 85°C). Verify application temperature requirements before selection.

Q: Do all substitute parts have the same regulatory approvals?

A: No. The 0239.750MXP carries CE, CSA, KC, and UL approvals. Substitute parts vary in approval scope. Verify that the selected part meets all required certifications for your application jurisdiction and standards.

Q: What is the significance of melting I²t values?

A: Melting I²t characterizes the thermal energy required to melt the fuse element. Variations among substitutes reflect different element designs but do not affect interchangeability at the rated 750 mA current.

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