Littelfuse 0313015.H Glass Cartridge Fuse 15A 32VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0313015.H is a 15A 32VAC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4"). This part is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and component replacement. The fuse requires a compatible holder for installation and is designed for AC/DC applications with a 300A breaking capacity at rated voltage.

Key Parameters

Parameter	Value
Current Rating	15 A
Voltage Rating (AC)	32 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	300A
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
DC Cold Resistance	0.005 Ohms
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution for the 0313015.H is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

Current Rating: 15 A (exact match required)
Voltage Rating (AC): 32 V (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)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

All substitute parts listed meet these critical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and compliance status are secondary considerations that do not affect basic functional substitution but may influence application-specific selection.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance	Product Status	RoHS Status
0313015.H	Littelfuse Inc.	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	300A	1870	0.005 Ohms	Obsolete	RoHS non-compliant
0313015.HXP	Littelfuse Inc.	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	300A	1870	0.005 Ohms	Active	ROHS3 Compliant
0313015.MXP	Littelfuse Inc.	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	300A	1870	0.005 Ohms	Active	ROHS3 Compliant
0313015.VXP	Littelfuse Inc.	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	300A	1870	0.005 Ohms	Active	ROHS3 Compliant
MDL-15-R	Eaton - Electronics Division	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	1kA	354	0.005 Ohms	Active	RoHS Compliant
BK/MDL-15-R	Eaton - Electronics Division	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	1kA	354	0.005 Ohms	Active	ROHS3 Compliant
MDQ-15	Eaton - Electronics Division	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	1kA	Not specified	0.0041 Ohms	Active	RoHS non-compliant
BK/MDQ-15	Eaton - Electronics Division	15 A	32 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	1kA	Not specified	0.0041 Ohms	Active	ROHS3 Compliant

Engineering Selection Recommendations

Littelfuse Direct Substitutes (0313015.HXP, 0313015.MXP, 0313015.VXP): These parts are manufactured by Littelfuse and maintain identical electrical and mechanical specifications to the obsolete 0313015.H. All three are in active product status with ROHS3 compliance. These represent the most direct replacement path for the obsolete part.

Eaton Parametric Equivalents (MDL-15-R, BK/MDL-15-R, MDQ-15, BK/MDQ-15): These Eaton fuses meet all critical electrical and mechanical parameters. The MDL and MDQ series differ in breaking capacity (1kA versus 300A) and melting I²t characteristics. MDL-15-R and BK/MDL-15-R carry CE, CSA, and UL certifications. BK/MDL-15-R and BK/MDQ-15 are ROHS3 compliant. MDL-15-R carries RoHS compliance. MDQ-15 is RoHS non-compliant.

Compliance Considerations: For applications requiring RoHS3 compliance, select from: 0313015.HXP, 0313015.MXP, 0313015.VXP, BK/MDL-15-R, or BK/MDQ-15. For applications with no RoHS requirement, all listed substitutes are functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can I use 0313015.HXP as a direct replacement for the obsolete 0313015.H? A: Yes. The 0313015.HXP is manufactured by Littelfuse with identical electrical ratings (15A, 32VAC), response time (slow blow), package format (3AB/3AG), and physical dimensions. The primary difference is active product status and ROHS3 compliance.

Q: What is the difference between Littelfuse and Eaton substitute options? A: Littelfuse substitutes (0313015.HXP, 0313015.MXP, 0313015.VXP) maintain the original 300A breaking capacity and 1870 melting I²t. Eaton substitutes (MDL and MDQ series) provide higher breaking capacity (1kA) with lower melting I²t (354). Both meet the core 15A, 32VAC, slow-blow, 3AB/3AG specifications.

Q: Are all substitute parts mechanically compatible with existing 3AB/3AG holders? A: Yes. All listed substitute parts share the identical package format (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L). They are mechanically interchangeable in any holder designed for this format.

Q: Which substitute should I select for a new design? A: For new designs, select from active product status parts. Littelfuse 0313015.HXP, 0313015.MXP, or 0313015.VXP are recommended for direct compatibility. Eaton MDL-15-R or BK/MDL-15-R are suitable alternatives with higher breaking capacity ratings.

Q: Does breaking capacity affect substitution compatibility? A: Breaking capacity does not affect basic functional substitution. All listed parts interrupt 15A at 32VAC. Breaking capacity (300A versus 1kA) determines the maximum fault current the fuse can safely interrupt. Application requirements determine whether higher breaking capacity is necessary.

Q: What is the significance of melting I²t values? A: Melting I²t characterizes the thermal energy required to melt the fuse element. Littelfuse parts specify 1870, while Eaton MDL series specify 354. This parameter affects response characteristics under transient overcurrent conditions. Selection depends on application-specific protection requirements.

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