Littelfuse 03136.25VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 03136.25VXP is a 6.25 A, 250 V AC/DC slow-blow glass cartridge fuse in the 313 series, designed for applications requiring reliable overcurrent protection in 3AB and 3AG holder configurations. The part is active in production with 887 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	6.25 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (6.35mm x 31.75mm)
Breaking Capacity	200 A @ Rated Voltage
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (6.25 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (1/4" x 1-1/4"), holder compatibility (3AB, 3AG), breaking capacity (200 A), and response time (slow blow). Parts are grouped into two categories:

Parametric Equivalents (Littelfuse 313 Series): Parts 03136.25HXIDP, 03136.25HXP, and 03136.25MXP meet all electrical and mechanical parameters. These parts differ only in melting I²t characteristics (242 vs. 140) and approval agency certifications, but maintain identical current, voltage, and dimensional specifications.

Manufacturer Recommended Substitutes (Eaton Electronics Division): Parts BK/MDL-6-1/4-R, BK/MDQ-6-1/4, MDL-6-1/4-R, and MDQ-6-1/4 are cross-manufacturer alternatives from Eaton that match the core electrical ratings and physical dimensions. These parts are approved for direct substitution in 3AB and 3AG holder applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	DC Cold Resistance (Ω)	RoHS Status	Approval Agencies
03136.25VXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.0154	ROHS3 Compliant	CE, CSA, KC, PSE, UL
03136.25HXIDP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.0154	ROHS3 Compliant	CE, CSA, K-MARK, PSE, UL
03136.25HXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.0154	ROHS3 Compliant	CE, CSA, K-MARK, PSE, UL
03136.25MXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.0154	ROHS3 Compliant	CE, CSA, K-MARK, PSE, UL
BK/MDL-6-1/4-R	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.02	ROHS3 Compliant	CE, CSA, UL
BK/MDQ-6-1/4	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.0169	RoHS non-compliant	CSA, UL
MDL-6-1/4-R	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	0.02	RoHS Compliant	CE, CSA, UL
MDQ-6-1/4	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Not Specified	RoHS Compliant	Not Specified

Engineering Selection Recommendations

For RoHS3 Compliant Applications: Select from Littelfuse 03136.25HXIDP, 03136.25HXP, 03136.25MXP, or Eaton BK/MDL-6-1/4-R and MDL-6-1/4-R. These parts maintain full ROHS3 compliance and are suitable for regulated markets requiring environmental compliance.

For Maximum Certification Coverage: The Littelfuse 03136.25VXP offers the broadest approval agency support (CE, CSA, KC, PSE, UL). If equivalent certification scope is required, Littelfuse 03136.25HXIDP and 03136.25HXP provide CE, CSA, K-MARK, PSE, and UL approvals.

For Cross-Manufacturer Substitution: Eaton BK/MDL-6-1/4-R and MDL-6-1/4-R are direct mechanical and electrical equivalents with CE, CSA, and UL certifications. These parts are suitable for applications where manufacturer diversification is required.

For Legacy or Non-Regulated Applications: Eaton BK/MDQ-6-1/4 and MDQ-6-1/4 are functionally equivalent but carry reduced RoHS compliance status and limited certification scope. Use only where regulatory requirements do not mandate ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute a Littelfuse 03136.25VXP with an Eaton MDL-6-1/4-R?

A: Yes. Both parts share identical electrical ratings (6.25 A, 250 V AC), response time (slow blow), mechanical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB, 3AG). Both are rated for 200 A breaking capacity and are suitable for direct substitution in circuit protection applications.

Q: What is the difference between 03136.25HXIDP and 03136.25HXP?

A: Both parts are Littelfuse 313 series equivalents with identical electrical and mechanical specifications. The primary difference is melting I²t rating (242 for both) and approval certifications. Both are ROHS3 compliant and suitable for direct substitution with the main part.

Q: Are all substitute parts compatible with 3AB and 3AG holders?

A: Yes. All listed substitute parts are specified for 3AB and 3AG holder compatibility with matching 1/4" x 1-1/4" (6.35mm x 31.75mm) dimensions. Physical installation is identical across all parts.

Q: Does the DC cold resistance difference affect substitution eligibility?

A: DC cold resistance values (ranging from 0.0154 to 0.02 Ohms) are within acceptable tolerance for fuse cartridges and do not affect substitution eligibility. All parts meet the 200 A breaking capacity requirement at rated voltage.

Q: Which substitute part has the best RoHS compliance status?

A: Littelfuse 03136.25HXIDP, 03136.25HXP, 03136.25MXP, Eaton BK/MDL-6-1/4-R, and Eaton MDL-6-1/4-R are all ROHS3 compliant. Eaton BK/MDQ-6-1/4 and MDQ-6-1/4 are not ROHS3 compliant and should be avoided in regulated applications.

Q: Can I use MDQ-6-1/4 as a substitute if RoHS compliance is not required?

A: Yes. MDQ-6-1/4 meets all electrical and mechanical parameters for direct substitution. However, it carries reduced certification scope (CSA and UL only) and is not ROHS3 compliant. Confirm that your application does not require these certifications before selection.

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