Littelfuse 0313003.H Glass Cartridge Fuse 3A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0313003.H is a 3 A, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" × 1-1/4"). This component is classified as obsolete, requiring identification of active equivalent and substitute parts for ongoing applications. The fuse is designed for use with standard 3AB and 3AG fuse holders and provides circuit protection with a 100 A breaking capacity at rated voltage.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" × 1-1/4"
Breaking Capacity @ Rated Voltage	100 A
Size / Dimension	0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution of the 0313003.H is determined by strict equivalence in the following parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" × 1-1/4" (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Breaking Capacity @ Rated Voltage: 100 A (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse): Parts 0313003.HXP, 0313003.HXIDP, 0313003.MXP, and 0313003.VXP maintain identical electrical and mechanical specifications with active product status and enhanced compliance certifications.

Parametric Equivalents (Alternative Manufacturers): Parts from Eaton (BK/MDL-3-R, BK/MDL-3RX-R, BK/MDQ-3, BP/MDL-3, MDL-3-R) meet all core electrical and mechanical requirements but may differ in melting I²t values and approval agency certifications.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity (A)	Product Status	RoHS Status
0313003.H	Littelfuse Inc.	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Obsolete	RoHS non-compliant
0313003.HXP	Littelfuse	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
0313003.HXIDP	Littelfuse Inc.	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
0313003.MXP	Littelfuse Inc.	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
0313003.VXP	Littelfuse	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
0313003.VXIDP	Littelfuse Inc.	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
BK/MDL-3-R	Eaton - Electronics Division	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	ROHS3 Compliant
BK/MDL-3RX-R	Eaton - Electronics Division	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	RoHS Compliant
BK/MDQ-3	Eaton - Electronics Division	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	RoHS non-compliant
BP/MDL-3	Eaton - Bussmann Electrical Division	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	35	Active	RoHS Compliant
MDL-3-R	Eaton - Electronics Division	3	250	Slow Blow	3AB, 3AG, 1/4" × 1-1/4"	100	Active	RoHS Compliant

Engineering Selection Recommendations

Primary Substitutes (Littelfuse Series 313): Parts 0313003.HXP, 0313003.HXIDP, 0313003.MXP, 0313003.VXP, and 0313003.VXIDP are direct equivalents from the same manufacturer and series. All are active products with ROHS3 compliance and extended approval agency certifications (CE, CSA, K-MARK, PSE, UL). These parts are suitable for direct replacement in applications requiring RoHS compliance.

Secondary Substitutes (Eaton MDL and MDQ Series): Parts BK/MDL-3-R, BK/MDL-3RX-R, MDL-3-R, and BK/MDQ-3 meet all core electrical and mechanical requirements. BK/MDL-3-R and MDL-3-R carry RoHS compliance and CE/CSA/UL certifications. BK/MDQ-3 is RoHS non-compliant. These alternatives are suitable where manufacturer flexibility is acceptable.

Not Recommended for Direct Substitution: BP/MDL-3 has a breaking capacity of 35 A, which differs from the 100 A specification of the original part and all other equivalents. This parameter deviation disqualifies it from direct substitution.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts in place of the 0313003.H?

A: Substitution is valid only for parts meeting all core parameters: 3 A current rating, 250 V AC voltage rating, slow-blow response time, 3AB/3AG package format, and 100 A breaking capacity. BP/MDL-3 does not meet the breaking capacity requirement and is not a valid substitute.

Q: What is the difference between Littelfuse and Eaton substitute parts?

A: Littelfuse parts (0313003.HXP, 0313003.HXIDP, 0313003.MXP, 0313003.VXP, 0313003.VXIDP) are from the same manufacturer as the original part and carry identical electrical specifications with enhanced compliance certifications. Eaton parts (BK/MDL-3-R, BK/MDL-3RX-R, MDL-3-R, BK/MDQ-3) are from an alternative manufacturer but meet equivalent electrical and mechanical requirements.

Q: Are all substitute parts RoHS compliant?

A: No. Littelfuse parts (0313003.HXP, 0313003.HXIDP, 0313003.MXP, 0313003.VXP, 0313003.VXIDP) are ROHS3 compliant. Eaton parts BK/MDL-3-R, BK/MDL-3RX-R, and MDL-3-R are RoHS compliant. BK/MDQ-3 is RoHS non-compliant. The original 0313003.H is RoHS non-compliant.

Q: Do all substitute parts fit in the same holder as the 0313003.H?

A: Yes. All substitute parts use the identical 3AB/3AG package format with 1/4" × 1-1/4" dimensions and require the same holder type.

Q: What is the significance of the melting I²t value?

A: Melting I²t is provided in the specification data but is not a substitution criterion for this product category. All parts listed meet the core electrical and mechanical requirements for substitution.

Q: Which substitute part has the highest inventory availability?

A: 0313003.HXP has 3,458 pieces in stock, the highest among all listed parts.

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