Littelfuse 0315.500H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0315.500H is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This fuse is classified as obsolete product status. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available through standard distribution channels.

Key Parameters

Parameter	Value
Current Rating	500 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	2.55
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	1.25 Ohms

Substitute Part Grouping Explanation

Substitute parts for the 0315.500H are qualified based on the following electrical and mechanical parameters:

Current Rating: 500 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)
Melting I²t: 2.55 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed maintain identical electrical performance and physical form factor compatibility with the original 0315.500H.

Parameter Comparison

Parameter	0315.500H	0315.500HXP	0315.500MXP	0315.500VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	500 mA	500 mA	500 mA	500 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	2.55	2.55	2.55	2.55
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	1.25 Ohms	1.26 Ohms	1.26 Ohms	1.26 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

The 0315.500H is obsolete and no longer in active production. Direct substitutes 0315.500HXP, 0315.500MXP, and 0315.500VXP are all active products from Littelfuse Inc. with identical electrical and mechanical specifications.

All three substitute parts carry expanded approval certifications (CE, CSA, UL) compared to the original part (CSA, UL) and comply with ROHS3 standards, whereas the original 0315.500H is RoHS non-compliant. DC cold resistance values for substitute parts are 1.26 Ohms versus 1.25 Ohms for the original, a negligible difference within normal manufacturing tolerance.

Selection among the three active substitutes should be based on packaging availability and inventory requirements, as all three maintain identical electrical performance and circuit protection characteristics.

Frequently Asked Questions (FAQ)

Q: Can 0315.500HXP, 0315.500MXP, and 0315.500VXP be used interchangeably with 0315.500H?

A: Yes. All three substitute parts meet the identical electrical and mechanical parameters required for direct substitution: 500 mA current rating, 250 V AC voltage rating, slow-blow response time, 3AB/3AG package format, 35 A breaking capacity, and 2.55 melting I²t value.

Q: What is the difference between the substitute parts?

A: The three substitute parts (0315.500HXP, 0315.500MXP, 0315.500VXP) are electrically and mechanically identical. Differences exist only in packaging format (all listed as Bulk) and inventory availability. All three are active products with ROHS3 compliance and CE/CSA/UL certifications.

Q: Why does the original 0315.500H have a DC cold resistance of 1.25 Ohms while substitutes show 1.26 Ohms?

A: The 0.01 Ohm difference falls within normal manufacturing tolerance for fuse elements and does not affect circuit protection performance or compatibility.

Q: Is the 0315.500H RoHS compliance status a concern when substituting with active parts?

A: The original 0315.500H is RoHS non-compliant. All substitute parts (0315.500HXP, 0315.500MXP, 0315.500VXP) are ROHS3 compliant, which represents an improvement in environmental and regulatory compliance for new designs or replacements.

Q: Are there any certifications differences between the original and substitute parts?

A: The original 0315.500H carries CSA and UL approvals. All substitute parts carry CE, CSA, and UL approvals, providing expanded regulatory coverage.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message