Littelfuse 0326012.MXDP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326012.MXDP is a 12 A, 250 V AC / 60 V DC ceramic fuse cartridge designed for slow-blow applications requiring holder mounting. This Active product is ROHS3 compliant and carries multiple international approvals (CE, CSA, UL). Substitute parts are necessary when inventory constraints, regional certification requirements, or specific performance characteristics necessitate alternative sourcing while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	12 A
Voltage Rating - AC	250 V
Voltage Rating - DC	60 V
Fuse Type	Cartridge, Ceramic
Response Time	Slow 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)
Breaking Capacity @ Rated Voltage	400A AC, 500A DC
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for ceramic fuse cartridges 0326012.MXDP is determined by strict equivalence across the following parameters:

Critical Matching Parameters:

Current Rating: 12 A (exact match required)
Voltage Rating - AC: 250 V (exact match required)
Voltage Rating - DC: 60 V (exact match required for DC applications)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required for holder compatibility)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required for mechanical fit)

Permitted Variation Parameters:

Melting I²t: Variation permitted within application-specific tolerance
DC Cold Resistance: Variation permitted within application-specific tolerance
Breaking Capacity: Variation permitted if equal to or exceeding rated voltage specification
Approval Agencies: Variation permitted; additional certifications acceptable

All substitute parts listed meet these criteria and are direct functional equivalents for the 0326012.MXDP.

Parameter Comparison

Parameter	0326012.MXDP (Main)	0326012.HXP	0326012.MXP	GSA 12-R
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bel Fuse Inc.
Current Rating (Amps)	12 A	12 A	12 A	12 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Voltage Rating - DC	60 V	60 V	60 V	Not specified
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
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"	3AB, 3AG, 1/4" x 1-1/4"
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)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)
Breaking Capacity @ Rated Voltage	400A AC, 500A DC	400A AC, 500A DC	400A AC, 500A DC	750A
Melting I²t	445	129	129	1277
DC Cold Resistance (Ohms)	0.0011	0.0067	0.0067	0.008
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CE, CSA, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, cURus, PSE
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

0326012.HXP and 0326012.MXP (Littelfuse Inc.)

These Littelfuse ceramic fuse cartridges are parametric equivalents to the 0326012.MXDP with identical electrical ratings and mechanical specifications. Both parts carry expanded international certifications (K-MARK, PSE) in addition to CE, CSA, and UL approvals. The 0326012.MXP offers significantly higher inventory availability (23,902 pcs) compared to the main part (2,300 pcs). Selection between these variants and the main part should be based on regional certification requirements and supply chain considerations.

GSA 12-R (Bel Fuse Inc.)

The GSA 12-R is a manufacturer-recommended substitute from Bel Fuse Inc. with identical current rating, AC voltage rating, fuse type, response time, and package specifications. This part carries CE, CSA, cURus, and PSE certifications. The GSA 12-R exhibits higher breaking capacity (750A) and melting I²t (1277) compared to the Littelfuse variants. Dimensional tolerance is within acceptable limits (0.250" Dia x 1.252" L vs. 0.250" Dia x 1.250" L). DC voltage rating is not specified for the GSA 12-R; applications requiring DC operation should confirm compatibility with the equipment manufacturer.

All substitute parts are ROHS3 compliant and carry Active product status.

Frequently Asked Questions (FAQ)

Q: Can 0326012.HXP and 0326012.MXP be used interchangeably with 0326012.MXDP?

A: Yes. Both parts are parametric equivalents with identical current rating (12 A), voltage ratings (250 V AC / 60 V DC), fuse type (ceramic cartridge), response time (slow blow), and package specifications (3AB, 3AG, 1/4" x 1-1/4"). All three are Littelfuse products with Active status and ROHS3 compliance.

Q: What is the difference between 0326012.MXDP and 0326012.HXP regarding melting I²t and DC cold resistance?

A: The 0326012.MXDP has a melting I²t of 445 and DC cold resistance of 0.0011 Ohms. The 0326012.HXP has a melting I²t of 129 and DC cold resistance of 0.0067 Ohms. These variations are permitted within the substitution criteria and do not affect compatibility for applications matching the specified electrical ratings.

Q: Is GSA 12-R suitable for DC applications?

A: The GSA 12-R specification does not include a DC voltage rating. Applications requiring DC operation should confirm compatibility with the equipment manufacturer before substitution.

Q: What is the significance of the dimensional difference between GSA 12-R and 0326012.MXDP?

A: The GSA 12-R length is 1.252" (31.80mm) compared to 1.250" (31.75mm) for the 0326012.MXDP. This 0.002" (0.05mm) difference is within acceptable mechanical tolerance for 3AB/3AG holder compatibility and does not affect functional performance.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The 0326012.MXDP, 0326012.HXP, 0326012.MXP, and GSA 12-R are all ROHS3 compliant.

Q: Which substitute part has the highest inventory availability?

A: The 0326012.MXP has the highest inventory availability at 23,902 pcs, compared to 1,656 pcs for 0326012.HXP and 2,174 pcs for GSA 12-R.

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