Littelfuse 0325.375H Ceramic Cartridge Fuse – Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325.375H is a 375 mA, 250 V AC ceramic cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This fuse is classified as obsolete, though 1,191 pieces remain in stock as new original inventory. The part operates with slow-blow response characteristics and is rated for 100 A breaking capacity at rated voltage. Due to its obsolete status, direct substitution with active production equivalents is necessary for new designs and ongoing procurement.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating – AC	250 V
Voltage Rating – DC	Not specified
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Ceramic
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	1.2
Size / Dimension	0.275" Dia x 1.288" L (6.99 mm x 32.72 mm)
DC Cold Resistance	2.14 Ohms
Product Status	Obsolete

Substitute Part Grouping Explanation

Three active production equivalents are available from Littelfuse within the 325 series: 0325.375HXP, 0325.375MXP, and 0325.375VXP. These substitutes maintain electrical and mechanical compatibility with the 0325.375H based on the following criteria:

Substitution-Determining Parameters:

Current Rating: 375 mA (identical)
Voltage Rating – AC: 250 V (identical)
Response Time: Slow Blow (identical)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (identical)
Fuse Type: Cartridge, Ceramic (identical)
Mounting Type: Through Hole (identical)
Melting I²t: 1.2 (identical)
Size / Dimension: 0.275" Dia x 1.288" L (6.99 mm x 32.72 mm) (identical)

All three substitute parts are currently in active production status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	0325.375H (Main)	0325.375HXP	0325.375MXP	0325.375VXP
Current Rating (Amps)	375 mA	375 mA	375 mA	375 mA
Voltage Rating – AC	250 V	250 V	250 V	250 V
Voltage Rating – DC	Not specified	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	100 A	100 A AC, 10 kA DC	100 A AC, 10 kA DC	100 A AC, 10 kA DC
Melting I²t	1.2	1.2	1.2	1.2
Size / Dimension	0.275" Dia x 1.288" L (6.99 mm x 32.72 mm)	0.275" Dia x 1.288" L (6.99 mm x 32.72 mm)	0.275" Dia x 1.288" L (6.99 mm x 32.72 mm)	0.275" Dia x 1.288" L (6.99 mm x 32.72 mm)
DC Cold Resistance	2.14 Ohms	2.155 Ohms	2.155 Ohms	2.155 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Inventory (Pcs)	1,191	924	975	1,139

Engineering Selection Recommendations

The 0325.375H is obsolete and should be replaced with one of the three active production equivalents: 0325.375HXP, 0325.375MXP, or 0325.375VXP. All three substitutes are electrically and mechanically identical to the main part across all critical fuse parameters.

Compliance Advantages of Substitutes:

All three substitutes are ROHS3 compliant, whereas the 0325.375H is RoHS non-compliant
All three substitutes carry CE certification in addition to CSA and UL approvals
All three substitutes include specified DC voltage rating (125 V) and operating temperature range (-55°C ~ 125°C), providing enhanced specification clarity
All three substitutes feature improved DC breaking capacity (10 kA DC) compared to the main part specification

For new designs and procurement, any of the three substitute parts (0325.375HXP, 0325.375MXP, 0325.375VXP) are suitable direct replacements. Selection among the three may be based on inventory availability or packaging preferences, as electrical and mechanical performance are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 0325.375HXP, 0325.375MXP, or 0325.375VXP be used as direct replacements for the 0325.375H?

A: Yes. All three substitute parts maintain identical current rating (375 mA), AC voltage rating (250 V), response time (slow blow), package format (3AB/3AG, 1/4" x 1-1/4" axial), and melting I²t (1.2). Physical dimensions and mounting type are identical, ensuring drop-in compatibility in through-hole applications.

Q: What is the difference between the three substitute parts?

A: The 0325.375HXP, 0325.375MXP, and 0325.375VXP are parametrically equivalent. All three are active production parts with identical electrical and mechanical specifications. Differences exist only in inventory levels and packaging designation (all listed as bulk packaging).

Q: Why do the substitute parts specify 125 V DC rating when the original part does not?

A: The substitute parts provide explicit DC voltage rating (125 V) and enhanced DC breaking capacity (10 kA DC), offering greater specification clarity for applications requiring DC operation. The original 0325.375H does not specify DC parameters. For AC-only applications, this difference is not relevant.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0325.375HXP, 0325.375MXP, 0325.375VXP) are ROHS3 compliant. The original 0325.375H is RoHS non-compliant.

Q: What certifications do the substitute parts carry?

A: All three substitute parts carry CE, CSA, and UL approvals. The original 0325.375H carries CSA and UL approvals only.

Q: Can these fuses be used in both AC and DC circuits?

A: The substitute parts are rated for 250 V AC and 125 V DC operation. The original part specifies 250 V AC only. For DC applications, the substitute parts provide explicit DC rating and higher breaking capacity.

Q: What is the operating temperature range?

A: The substitute parts operate from -55°C to 125°C. The original part does not specify an operating temperature range.

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