Littelfuse 0315.375H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0315.375H is a 375 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing circuit protection applications. Direct substitutes are available from the same manufacturer with identical electrical and mechanical specifications but current product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	1.23
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99 mm x 32.39 mm)
DC Cold Resistance	2.08 Ohms (main part); 2.095 Ohms (substitutes)

Substitute Part Grouping Explanation

Substitution of the obsolete 0315.375H is based on strict electrical and mechanical parameter matching. All substitute parts maintain identical current rating (375 mA), voltage rating (250 V AC), response time classification (slow blow), package format (3AB/3AG), physical dimensions (0.275" Dia x 1.275" L), breaking capacity (35 A), and melting I²t value (1.23). The three active substitute part numbers—0315.375HXP, 0315.375MXP, and 0315.375VXP—are direct parametric equivalents manufactured by Littelfuse Inc. and differ only in packaging configuration (bulk) and compliance certifications. DC cold resistance values across all substitutes remain within 0.005 Ohms of the original specification, representing negligible variance in circuit performance.

Parameter Comparison

Parameter	0315.375H (Main)	0315.375HXP	0315.375MXP	0315.375VXP
Current Rating (Amps)	375 mA	375 mA	375 mA	375 mA
Voltage Rating - AC	250 V	250 V	250 V	250 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, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Melting I²t	1.23	1.23	1.23	1.23
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99 mm x 32.39 mm)	0.275" Dia x 1.275" L (6.99 mm x 32.39 mm)	0.275" Dia x 1.275" L (6.99 mm x 32.39 mm)	0.275" Dia x 1.275" L (6.99 mm x 32.39 mm)
DC Cold Resistance	2.08 Ohms	2.095 Ohms	2.095 Ohms	2.095 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

Engineering Selection Recommendations

All three substitute parts (0315.375HXP, 0315.375MXP, 0315.375VXP) are direct functional replacements for the obsolete 0315.375H. Selection among these active alternatives should be based on supply chain availability and compliance requirements. The substitute parts carry active product status, ROHS3 compliance certification, and expanded approval agency recognition (CE, CSA, UL) compared to the original part. DC cold resistance variance (2.095 Ohms vs. 2.08 Ohms) is within acceptable engineering tolerance and does not affect circuit protection performance. All substitutes maintain identical electrical performance characteristics, breaking capacity, and thermal operating range.

Frequently Asked Questions (FAQ)

Q: Can the 0315.375HXP, 0315.375MXP, or 0315.375VXP be used as direct replacements for the 0315.375H?

A: Yes. All three substitute parts are parametric equivalents with identical current rating (375 mA), voltage rating (250 V AC), response time (slow blow), package format (3AB/3AG), physical dimensions, and breaking capacity. They are direct functional replacements.

Q: What is the difference between the three substitute part numbers?

A: The three substitute parts are electrically and mechanically identical. They differ only in packaging configuration (all bulk) and represent different manufacturing or distribution variants from Littelfuse Inc. All carry active product status and ROHS3 compliance.

Q: Is the DC cold resistance difference (2.08 Ohms vs. 2.095 Ohms) significant?

A: No. The variance of 0.015 Ohms represents a 0.72% difference and is within acceptable engineering tolerance for fuse applications. This does not affect circuit protection performance or thermal characteristics.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0315.375HXP, 0315.375MXP, 0315.375VXP) are ROHS3 compliant, whereas the original 0315.375H is RoHS non-compliant.

Q: Do the substitute parts have the same approval certifications?

A: The substitute parts carry expanded certifications (CE, CSA, UL) compared to the original part (CSA, UL). This provides additional regulatory coverage for international applications.

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

A: Yes. All parts are rated for 250 V AC/DC operation and are suitable for both circuit types within the specified voltage and current parameters.

Q: What is the physical compatibility of the substitute parts?

A: All substitute parts maintain the identical 3AB/3AG package format and physical dimensions (0.275" Dia x 1.275" L / 6.99 mm x 32.39 mm). They are mechanically interchangeable in existing through-hole fuse holders.

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