Littelfuse 0326015.MXDP Ceramic Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326015.MXDP is a 15 A ceramic fuse cartridge rated for 250 V AC and 60 V DC operation. This slow-blow cartridge fuse requires a compatible holder and is designed for applications requiring reliable overcurrent protection with controlled response characteristics. The part maintains active product status with full compliance to CE, CSA, and UL standards. Substitute parts are identified when electrical ratings, mechanical dimensions, and approval certifications align with the original specification, ensuring direct functional equivalence in protected circuits.

Key Parameters

Parameter	Value
Current Rating	15 A
Voltage Rating - AC	250 V
Voltage Rating - DC	60 V
Response Time	Slow Blow
Fuse Type	Cartridge, Ceramic
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	400 A AC, 500 A DC
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.250" Dia x 1.250" L (6.35 mm x 31.75 mm)
Approval Agencies	CE, CSA, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0326015.MXDP is determined by strict equivalence across the following critical parameters:

Current Rating: 15 A (exact match required)
Voltage Ratings: 250 V AC and 60 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Physical Dimensions: 0.250" Dia x 1.250" L (exact match required for holder compatibility)
Approval Certifications: Minimum CE, CSA, UL compliance

The substitute part 0326015.MXP meets all electrical and mechanical requirements for direct substitution. Both parts are manufactured by Littelfuse Inc., belong to the 326 series, and maintain identical current, voltage, and dimensional specifications. Differences in secondary parameters such as melting I²t, DC cold resistance, and extended approval certifications do not affect functional equivalence in standard circuit protection applications.

Parameter Comparison

Parameter	0326015.MXDP (Main Part)	0326015.MXP (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.
Series	326	326
Current Rating (Amps)	15 A	15 A
Voltage Rating - AC	250 V	250 V
Voltage Rating - DC	60 V	60 V
Response Time	Slow Blow	Slow Blow
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic
Package / Case	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 (6.35 mm x 31.75 mm)	0.250" Dia x 1.250" L (6.35 mm x 31.75 mm)
Breaking Capacity @ Rated Voltage	400 A AC, 500 A DC	400 A AC, 500 A DC
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Approval Agencies	CE, CSA, UL	CE, CSA, K-MARK, PSE, UL
Melting I²t	760	245
DC Cold Resistance	0.0083 Ohms	0.005 Ohms

Engineering Selection Recommendations

Both the 0326015.MXDP and 0326015.MXP are active products manufactured by Littelfuse Inc. with full compliance to CE, CSA, and UL standards. The 0326015.MXP provides extended approval certifications including K-MARK and PSE, which may be advantageous for applications requiring broader international compliance. Both parts maintain identical electrical ratings, mechanical dimensions, and breaking capacity specifications, ensuring functional equivalence in circuit protection applications. Selection between these parts should be based on availability, inventory levels, and specific regional certification requirements for the end application.

Frequently Asked Questions (FAQ)

Q: Can 0326015.MXP be used as a direct replacement for 0326015.MXDP?

A: Yes. Both parts are identical in current rating (15 A), voltage ratings (250 V AC, 60 V DC), response time (Slow Blow), fuse type (Cartridge, Ceramic), and physical dimensions (0.250" Dia x 1.250" L). They are mechanically and electrically interchangeable in any circuit designed for the 0326015.MXDP.

Q: Are there any holder compatibility differences between these parts?

A: No. Both parts use the same package designation (3AB, 3AG, 1/4" x 1-1/4") and identical physical dimensions. They are compatible with the same fuse holders.

Q: What is the significance of the different melting I²t values?

A: The melting I²t parameter (760 for 0326015.MXDP and 245 for 0326015.MXP) reflects internal thermal characteristics. Both parts maintain the same 15 A current rating and slow-blow response time, ensuring equivalent protection behavior in standard applications.

Q: Does the lower DC cold resistance of 0326015.MXP affect performance?

A: No. The DC cold resistance difference (0.0083 Ohms versus 0.005 Ohms) does not affect the protective function or response characteristics of the fuse in typical circuit protection applications.

Q: Which part should be selected for international applications?

A: The 0326015.MXP includes additional approval certifications (K-MARK and PSE) beyond the base CE, CSA, and UL certifications of the 0326015.MXDP. Selection should align with the specific regional requirements of the target market.

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