Littelfuse 0315.200H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0315.200H is a 200 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, making equivalent substitute parts necessary for ongoing circuit protection applications. Active production alternatives with identical electrical and mechanical specifications are available from the same manufacturer.

Key Parameters

Parameter	Value
Current Rating	200 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	0.27
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)

Substitute Part Grouping Explanation

Substitution for the 0315.200H is determined by strict equivalence across the following critical parameters:

Current Rating: 200 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Mounting Type: Through Hole (exact match required)
Breaking Capacity: 35 A (exact match required)
Melting I²t: 0.27 (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc. The primary distinction between the obsolete main part and active substitutes is product status and regulatory compliance.

Parameter Comparison

Parameter	0315.200H (Main)	0315.200HXP	0315.200MXP	0315.200VXP
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse	Littelfuse Inc.
Current Rating (Amps)	200 mA	200 mA	200 mA	200 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
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)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Melting I²t	0.27	0.27	0.27	0.27
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	6.54 Ohms	6.59 Ohms	6.59 Ohms	6.59 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 (0315.200HXP, 0315.200MXP, 0315.200VXP) provide direct functional equivalence to the obsolete 0315.200H. Selection among these active alternatives should be based on the following factors:

Product Status: All substitutes are in active production, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The substitute parts carry ROHS3 compliance and expanded approval certifications (CE, CSA, UL) compared to the main part's CSA and UL certifications only. This expanded compliance profile supports applications requiring European market qualification.

DC Cold Resistance: The substitute parts exhibit 6.59 Ohms DC cold resistance versus 6.54 Ohms for the main part. This minor variance (0.05 Ohms) is within acceptable tolerance for cartridge fuse applications and does not affect circuit protection performance.

Packaging: All substitutes are supplied in bulk packaging, suitable for production environments. The main part's original packaging format is not specified.

For new designs or component replacement in existing circuits, any of the three substitute parts may be selected based on procurement availability and supply chain preferences.

Frequently Asked Questions (FAQ)

Q: Can the 0315.200HXP, 0315.200MXP, or 0315.200VXP be used as direct replacements for the 0315.200H?

A: Yes. All three parts are parametrically equivalent across current rating, voltage rating, fuse type, response time, package format, mounting type, breaking capacity, melting I²t, and operating temperature range. Direct substitution is supported without circuit modification.

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

A: The three substitute parts are functionally identical. Differences are limited to minor DC cold resistance variance (6.59 Ohms versus 6.54 Ohms in the main part) and packaging designation. All carry identical electrical and mechanical specifications.

Q: Why is the main part 0315.200H classified as obsolete?

A: The 0315.200H is no longer in active production. The listed substitute parts represent the current active production equivalents from Littelfuse Inc.

Q: Are the substitute parts RoHS compliant?

A: Yes. All three substitute parts (0315.200HXP, 0315.200MXP, 0315.200VXP) are ROHS3 compliant. The main part 0315.200H is RoHS non-compliant.

Q: Do the substitute parts have additional certifications?

A: Yes. The substitute parts carry CE, CSA, and UL certifications. The main part carries CSA and UL certifications only. The addition of CE certification supports applications requiring European market qualification.

Q: Is the DC cold resistance difference between the main part and substitutes significant?

A: No. The DC cold resistance variance of 0.05 Ohms (6.54 Ohms main part versus 6.59 Ohms substitutes) is negligible for cartridge fuse applications and does not affect circuit protection performance or thermal characteristics.

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

A: Yes. All parts are rated for 250 V AC/DC operation, supporting both alternating and direct current applications within the specified voltage and current limits.

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