Littelfuse 0239003.MXF34P Glass Cartridge Fuse 3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0239003.MXF34P is a 3A 250VAC slow-blow glass cartridge fuse in 5x20mm form factor, designed for circuit protection in AC and DC applications. This Active product requires a fuse holder for installation and is compliant with CE, CSA, KC, PSE, and UL standards. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and regulatory approvals to ensure direct interchangeability in protected circuit designs.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	100A
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0239003.MXF34P are classified as parametric equivalents based on the following matching criteria:

Primary Substitution Parameters:

Current Rating: 3 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity @ Rated Voltage: 100A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed maintain identical electrical and mechanical specifications. Littelfuse variants (0239003.HXP, 0239003.MXP, 0239003.TXP, 0239003.VXP) differ only in internal construction or lead material while preserving all functional parameters. The OptiFuse TSC-3A represents a cross-manufacturer equivalent meeting the same performance envelope.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (AC)	Fuse Type	Response Time	Package	Breaking Capacity (A)	Operating Temp (°C)	RoHS Status	Inventory (Pcs)
0239003.MXF34P	Littelfuse Inc.	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	982
0239003.HXP	Littelfuse Inc.	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	2802
0239003.MXP	Littelfuse Inc.	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	2528
0239003.TXP	Littelfuse Inc.	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	903
0239003.VXP	Littelfuse Inc.	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	988
TSC-3A	OptiFuse	3	250	Cartridge, Glass	Slow Blow	5x20mm	100	-55 ~ 125	ROHS3 Compliant	8359

Engineering Selection Recommendations

All listed substitute parts are Active products with regulatory compliance suitable for direct replacement in circuit protection applications. Selection among Littelfuse variants (0239003.HXP, 0239003.MXP, 0239003.TXP, 0239003.VXP) may be based on inventory availability and lead material specifications. The OptiFuse TSC-3A provides an alternative cross-manufacturer source while maintaining UL 248 and cULus certifications. All parts carry ROHS3 compliance and are rated for the full -55°C to 125°C operating temperature range, supporting deployment in industrial and consumer protection circuits.

Frequently Asked Questions (FAQ)

Q: Can 0239003.HXP, 0239003.MXP, 0239003.TXP, and 0239003.VXP be used interchangeably with 0239003.MXF34P?

A: Yes. All Littelfuse variants share identical electrical ratings (3A, 250VAC), response characteristics (slow-blow), mechanical dimensions (5x20mm), and breaking capacity (100A). Differences in part number suffixes reflect internal construction or lead material variations that do not affect functional performance in circuit protection applications.

Q: Is TSC-3A from OptiFuse a direct substitute for the Littelfuse 0239003.MXF34P?

A: Yes. The TSC-3A meets all primary substitution parameters: 3A current rating, 250VAC voltage rating, 5x20mm package, slow-blow response, and 100A breaking capacity. Both products are ROHS3 compliant and rated for -55°C to 125°C operation. Regulatory certifications differ (OptiFuse holds cULus and UL 248; Littelfuse holds CE, CSA, KC, PSE, UL), but both are recognized standards for circuit protection devices.

Q: What mounting considerations apply to all substitute parts?

A: All substitute parts require a fuse holder for installation. The 5x20mm form factor is standardized across all listed parts, ensuring mechanical compatibility with existing fuse holder designs. No modifications to circuit board layout or holder specifications are necessary when substituting between listed parts.

Q: Are there inventory differences between substitute options?

A: Yes. Inventory levels vary: 0239003.HXP (2802 pcs), 0239003.MXP (2528 pcs), 0239003.VXP (988 pcs), 0239003.TXP (903 pcs), TSC-3A (8359 pcs), and 0239003.MXF34P (982 pcs). Selection may be influenced by supply chain requirements and lead time considerations.

Q: Do all substitute parts comply with the same regulatory standards?

A: All parts are ROHS3 compliant and REACH unaffected. Littelfuse variants carry CE, CSA, KC, PSE, and UL approvals. OptiFuse TSC-3A carries cULus and UL 248 certifications. Both certification sets are recognized for circuit protection applications in regulated markets.

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