Littelfuse 0313.375H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0313.375H is a 375 mA, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder compatibility. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse provides circuit protection in applications requiring moderate current ratings with extended response time before rupture.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (375 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), physical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB, 3AG). All listed substitute parts meet these core electrical and mechanical requirements.

The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Littelfuse): Parts 0313.375HXP, 0313.375MXP, and 0313.375VXP are manufactured by Littelfuse and maintain identical electrical specifications and physical form factors. These parts differ primarily in packaging configuration and product status.

Cross-Manufacturer Parametric Equivalents: Parts from Eaton (BK/MDL-3/8-R, BK/MDQ-3/8, MDL-3/8-R, MDQ-3/8) and SCHURTER (0034.5217) provide functional equivalence with identical current, voltage, and physical specifications. Minor variations exist in melting I²t values and DC cold resistance, which remain within acceptable tolerance for interchangeability in standard circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
0313.375H	Littelfuse Inc.	375	250	Slow Blow	35	1.23	2.08	Obsolete	Non-compliant
0313.375HXP	Littelfuse Inc.	375	250	Slow Blow	35	1.23	2.095	Active	ROHS3 Compliant
0313.375MXP	Littelfuse	375	250	Slow Blow	35	1.23	2.095	Active	ROHS3 Compliant
0313.375VXP	Littelfuse Inc.	375	250	Slow Blow	35	1.23	2.095	Active	ROHS3 Compliant
0034.5217	SCHURTER Inc.	375	250	Slow Blow	35	1.38	Not specified	Obsolete	ROHS3 Compliant
BK/MDL-3/8-R	Eaton - Electronics Division	375	250	Slow Blow	35	0.982	1.567	Active	ROHS3 Compliant
BK/MDQ-3/8	Eaton - Electronics Division	375	250	Slow Blow	35	Not specified	2.35	Active	Non-compliant
MDL-3/8-R	Eaton - Electronics Division	375	250	Slow Blow	35	0.982	1.567	Active	Compliant
MDQ-3/8	Eaton - Electronics Division	375	250	Slow Blow	35	Not specified	2.35	Active	Not specified

Engineering Selection Recommendations

For new designs and systems requiring RoHS3 compliance, select from active-status parts with compliant certifications: 0313.375HXP, 0313.375MXP, 0313.375VXP (Littelfuse), BK/MDL-3/8-R, or MDL-3/8-R (Eaton). These parts carry CE, CSA, and UL approvals and maintain full regulatory compliance.

For legacy system replacement where the original 0313.375H is no longer available, 0313.375HXP provides direct equivalence with identical electrical characteristics and active product status. This part is the primary recommended substitute.

For applications where cross-manufacturer sourcing is required, Eaton MDL-3/8-R and BK/MDL-3/8-R offer active status with RoHS compliance. Eaton MDQ-series parts (BK/MDQ-3/8, MDQ-3/8) remain available but carry non-compliant or unspecified RoHS status.

SCHURTER 0034.5217 is classified as obsolete and should be avoided for new procurement despite RoHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0313.375H with 0313.375HXP?

A: Yes. Both parts share identical electrical specifications (375 mA, 250 V AC, slow-blow response), physical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB, 3AG). The primary difference is product status: 0313.375H is obsolete while 0313.375HXP is active with RoHS3 compliance.

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

A: All parts meet the core substitution criteria of 375 mA, 250 V AC, slow-blow response, and 3AB/3AG compatibility. Differences exist in melting I²t values and DC cold resistance. Littelfuse parts (0313.375HXP, 0313.375MXP, 0313.375VXP) maintain the original melting I²t of 1.23, while Eaton MDL-series parts have a lower melting I²t of 0.982. These variations remain within acceptable tolerance for standard circuit protection applications.

Q: Are all substitute parts certified for the same applications?

A: All substitute parts carry CSA and UL approvals. Littelfuse active-status parts and Eaton MDL-series additionally carry CE certification. Eaton MDQ-series parts carry CSA and UL only. Verify specific application requirements against individual part certifications.

Q: What does RoHS compliance mean for fuse selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. For new designs and systems subject to environmental regulations, select RoHS3-compliant parts: 0313.375HXP, 0313.375MXP, 0313.375VXP, 0034.5217, BK/MDL-3/8-R, or MDL-3/8-R.

Q: Can I use parts with different melting I²t values interchangeably?

A: All listed parts maintain the same 35A breaking capacity and 375 mA current rating. Melting I²t variations (ranging from 0.982 to 1.38) reflect different thermal response characteristics but do not prevent interchangeability in applications designed for 375 mA, 250 V AC slow-blow fuses with 3AB/3AG holder compatibility.

Q: Which substitute part has the best availability?

A: 0313.375MXP shows the highest inventory (3,666 pcs), followed by BK/MDL-3/8-R (1,162 pcs) and 0313.375HXP (991 pcs). All listed parts maintain active stock status except 0313.375H and 0034.5217, which are obsolete.

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