Littelfuse 0229004.MXSP Glass Cartridge Fuse 4A 125VAC/VDC 2AG Equivalent & Substitute Parts

Part Overview

The Littelfuse 0229004.MXSP is a 4 A, 125 V AC/DC glass cartridge fuse in 2AG package format (5mm x 15mm). This fuse is designed for circuit protection in applications requiring slow-blow response characteristics. The part is Active status and widely used in industrial and consumer electronics where reliable overcurrent protection is essential. Substitute parts are identified when equivalent electrical and mechanical specifications are required for procurement flexibility, inventory management, or regional availability.

Key Parameters

Parameter	Specification
Current Rating	4 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	400 A
Melting I²t	148
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0258 Ohms
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, PSE, UL

Substitute Part Grouping Explanation

Substitute parts for the 0229004.MXSP are determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters define substitutability:

Current Rating: 4 A (exact match required)
Voltage Rating: 125 V AC and 125 V DC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 2AG, 5mm x 15mm (exact match required)
Response Time: Slow Blow (exact match required)
Breaking Capacity: 400 A (exact match required)
Melting I²t: 148 (exact match required)
Operating Temperature: -55°C to 125°C (exact match required)
DC Cold Resistance: 0.0258 Ohms (exact match required)
Compliance: CE, CSA, PSE, UL certifications (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc. under the same Series 229 designation.

Parameter Comparison

Parameter	0229004.MXSP	0229004.HXP	0229004.HXSP	0229004.MXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	4 A	4 A	4 A	4 A
Voltage Rating - AC	125 V	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm	2AG, 5mm x 15mm
Breaking Capacity @ Rated Voltage	400 A	400 A	400 A	400 A
Melting I²t	148	148	148	148
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.0258 Ohms	0.0258 Ohms	0.0258 Ohms	0.0258 Ohms
Series	229	229	229	229
Product Status	Active	Active	Active	Active
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Approval Agency	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All substitute parts listed—0229004.HXP, 0229004.HXSP, and 0229004.MXP—are direct parametric equivalents to the 0229004.MXSP. Each part maintains identical electrical ratings, mechanical dimensions, response characteristics, and regulatory compliance certifications (CE, CSA, PSE, UL). All parts are Active status products manufactured by Littelfuse Inc. under Series 229.

Selection among these equivalents may be based on inventory availability and regional procurement channels. The 0229004.HXP variant currently has the highest inventory level at 5070 pieces, while 0229004.HXSP and 0229004.MXP maintain 980 and 1819 pieces respectively. The original 0229004.MXSP maintains 954 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can 0229004.HXP, 0229004.HXSP, and 0229004.MXP be used interchangeably with 0229004.MXSP?

A: Yes. All parts are parametric equivalents with identical current ratings (4 A), voltage ratings (125 V AC/DC), fuse type (cartridge glass), package format (2AG, 5mm x 15mm), response time (slow blow), breaking capacity (400 A), and regulatory certifications. They are direct substitutes for circuit protection applications.

Q: What determines if a fuse can substitute for the 0229004.MXSP?

A: Substitution requires exact equivalence across current rating, voltage rating (AC and DC), fuse type, package dimensions, response time, breaking capacity, melting I²t value, operating temperature range, and regulatory approvals. Any deviation in these parameters disqualifies a part as a substitute.

Q: Are all substitute parts ROHS3 compliant and internationally certified?

A: Yes. All listed substitute parts are ROHS3 compliant and carry identical regulatory approvals: CE, CSA, PSE, and UL. All parts are REACH Unaffected.

Q: Does the fuse require a holder for installation?

A: Yes. The 0229004.MXSP and all substitute parts require a holder for installation. The 2AG package format (5mm x 15mm) is designed for use with standard 2AG fuse holders.

Q: What is the operating temperature range for these fuses?

A: All parts operate within the range of -55°C to 125°C, ensuring functionality across industrial and consumer application environments.

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