Littelfuse 0312012.VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0312012.VXP is a 12 A, 32 V AC/DC glass cartridge fuse designed for 3AB and 3AG holder applications. This fast-blow fuse is rated for 300 A breaking capacity at rated voltage and operates across -55°C to 125°C. The part is Active status and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, holder compatibility, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	12 A
Voltage Rating (AC)	32 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0312012.VXP are qualified based on the following criteria:

Electrical Parameters: Current rating of 12 A and voltage rating of 32 V AC/DC must match exactly. Response time classification (Fast Blow) must be identical.

Mechanical Parameters: Package designation (3AB, 3AG) and physical dimensions (0.250" Dia x 1.250" L) must be identical to ensure compatibility with existing holder hardware.

Functional Parameters: Fuse type (Cartridge, Glass) and mounting requirement (Requires Holder) must match.

Compliance Parameters: Parts must maintain ROHS3 compliance and hold equivalent approval certifications (CSA, UL, or cULus).

All substitute parts listed meet these criteria and are direct functional equivalents suitable for replacement in the same circuit protection application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Approval Agency	Product Status	RoHS Status
0312012.VXP	Littelfuse Inc.	12	32	Fast Blow	300 A	234.6	0.0072	CSA, UL	Active	ROHS3 Compliant
0312012.HXP	Littelfuse Inc.	12	32	Fast Blow	300 A	234.6	0.0072	CSA, cULus	Active	ROHS3 Compliant
0312012.MXP	Littelfuse Inc.	12	32	Fast Blow	300 A	234.6	0.0072	CSA, cULus	Active	ROHS3 Compliant
BK/AGC-12-R	Eaton - Electronics Division	12	32	Fast Blow	1 kA	696.96	0.006	CSA, UL	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are Active status products with ROHS3 compliance and CSA/UL or cULus certifications. Selection among the Littelfuse 0312012 series variants (VXP, HXP, MXP) is based on approval agency requirements and internal sourcing preferences, as electrical and mechanical parameters are identical.

The Eaton BK/AGC-12-R is a cross-manufacturer equivalent with identical electrical ratings and mechanical compatibility. This part features higher breaking capacity (1 kA versus 300 A) and higher melting I²t (696.96 versus 234.6), which provides enhanced performance margin in the same physical package. Selection of the Eaton part is appropriate where higher breaking capacity is acceptable or required by circuit design specifications.

Frequently Asked Questions (FAQ)

Q: Can 0312012.HXP and 0312012.MXP be used interchangeably with 0312012.VXP?

A: Yes. All three Littelfuse parts share identical electrical ratings (12 A, 32 V), response time (Fast Blow), mechanical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG). Differences in approval certifications (UL versus cULus) do not affect functional interchangeability.

Q: Is the Eaton BK/AGC-12-R a direct substitute for the Littelfuse 0312012.VXP?

A: Yes, for holder compatibility and basic electrical function. The BK/AGC-12-R matches the 12 A current rating, 32 V voltage rating, Fast Blow response, and 3AB/3AG package dimensions. However, it provides higher breaking capacity (1 kA) and higher melting I²t (696.96). Verify that the higher performance parameters are acceptable for your application.

Q: What determines if a fuse can substitute for the 0312012.VXP?

A: Substitution requires matching current rating (12 A), voltage rating (32 V AC), response time (Fast Blow), physical dimensions (0.250" Dia x 1.250" L), and holder type (3AB, 3AG). All listed parts meet these criteria.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed—0312012.VXP, 0312012.HXP, 0312012.MXP, and BK/AGC-12-R—are ROHS3 compliant.

Q: What is the difference between the Littelfuse variants?

A: The 0312012.VXP, 0312012.HXP, and 0312012.MXP are electrically and mechanically identical. Differences are limited to approval certifications: VXP and HXP carry CSA/UL or CSA/cULus markings respectively. Selection is based on regional or customer certification requirements.

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