Littelfuse 031301.2VXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 031301.2VXP is a 1.2 A, 250 V AC/DC slow-blow glass cartridge fuse designed for 3AB and 3AG holder applications. This fuse is classified as Active product status and carries multiple international approvals including CE, CSA, PSE, and UL certifications. Equivalent substitute parts are available to support procurement flexibility, inventory management, and supply chain continuity while maintaining identical electrical and mechanical specifications.

Key Parameters

Parameter	Specification
Current Rating	1.2 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	21.5
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.278 Ohms
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Approval Agencies	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 031301.2VXP are determined by strict equivalence across all critical electrical and mechanical parameters. The following parts are direct parametric equivalents:

Substitution Criteria:

Current Rating: 1.2 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)
Melting I²t: 21.5 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
DC Cold Resistance: 0.278 Ohms (exact match required)
Approval Agencies: CE, CSA, PSE, UL (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Equivalent Part Numbers:

031301.2HXP
031301.2MXP

Parameter Comparison

Parameter	031301.2VXP	031301.2HXP	031301.2MXP
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	1.2 A	1.2 A	1.2 A
Voltage Rating - AC	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A
Melting I²t	21.5	21.5	21.5
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.278 Ohms	0.278 Ohms	0.278 Ohms
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Approval Agency	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active
Mounting Type	Requires Holder	Requires Holder	Requires Holder

Engineering Selection Recommendations

All three part numbers—031301.2VXP, 031301.2HXP, and 031301.2MXP—are Active product status and carry identical international regulatory approvals (CE, CSA, PSE, UL). Each part maintains ROHS3 compliance and REACH Unaffected status. Selection between these equivalent parts may be based on inventory availability and procurement lead times, as all electrical and mechanical parameters are identical. All parts are suitable for direct substitution in applications requiring a 1.2 A, 250 V AC/DC slow-blow glass cartridge fuse with 3AB/3AG holder compatibility.

Frequently Asked Questions (FAQ)

Q: Can 031301.2HXP and 031301.2MXP be used interchangeably with 031301.2VXP?

A: Yes. All three part numbers are parametric equivalents with identical electrical ratings (1.2 A, 250 V AC/DC), response time (Slow Blow), breaking capacity (100 A), melting I²t (21.5), operating temperature range (-55°C ~ 125°C), and physical dimensions (0.250" Dia x 1.250" L). They are approved by the same regulatory agencies and carry identical compliance certifications.

Q: What holder types are compatible with these fuses?

A: These fuses are designed for 3AB and 3AG holder applications. The physical dimensions of 1/4" diameter by 1-1/4" length ensure compatibility with standard 3AB and 3AG fuse holders.

Q: Are there any differences in DC cold resistance between the substitute parts?

A: No. All three part numbers maintain identical DC cold resistance of 0.278 Ohms, ensuring consistent electrical performance in DC applications.

Q: Do all substitute parts carry the same international approvals?

A: Yes. All three part numbers carry CE, CSA, PSE, and UL approvals, confirming compliance with international safety and performance standards.

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

A: The operating temperature range for all three equivalent parts is -55°C to 125°C, supporting operation across industrial and commercial temperature environments.

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