Littelfuse 03136.25H Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 03136.25H is a 6.25 A, 250 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The part requires a compatible fuse holder for installation and is designed for general-purpose circuit protection applications requiring slow-blow response characteristics.

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 @ Rated Voltage	200 A
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the 03136.25H is determined by strict equivalence across the following parameters:

Current Rating: 6.25 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" x 1-1/4" (exact match required)
Breaking Capacity: 200 A (exact match required)
Fuse Type: Cartridge, Glass (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not affect functional substitutability within the specified electrical envelope.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Product Status	RoHS Status
03136.25H	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Obsolete	RoHS non-compliant
03136.25HXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
03136.25HXIDP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
03136.25MXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
03136.25VXIDP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
03136.25VXP	Littelfuse Inc.	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
BK/MDL-6-1/4-R	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	ROHS3 Compliant
BK/MDQ-6-1/4	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	RoHS non-compliant
MDL-6-1/4-R	Eaton - Electronics Division	6.25	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	Active	RoHS Compliant

Engineering Selection Recommendations

For applications requiring replacement of the obsolete 03136.25H, the following selection criteria apply:

Littelfuse Active Alternatives (03136.25HXP, 03136.25HXIDP, 03136.25MXP, 03136.25VXIDP, 03136.25VXP): All Littelfuse substitutes maintain active product status and carry ROHS3 compliance. These parts are certified by CE, CSA, K-MARK, PSE, and UL approval agencies. Operating temperature range is specified as -55°C to 125°C. These options provide direct manufacturer continuity and are recommended for new designs and systems requiring modern compliance standards.

Eaton Alternatives (BK/MDL-6-1/4-R, MDL-6-1/4-R, BK/MDQ-6-1/4): Eaton-manufactured substitutes are active products with CE, CSA, and UL certifications. BK/MDL-6-1/4-R and MDL-6-1/4-R carry ROHS3 compliance, while BK/MDQ-6-1/4 is RoHS non-compliant. These parts are functionally equivalent within the specified electrical parameters and provide cross-manufacturer interchangeability.

For systems with RoHS compliance requirements, select from Littelfuse ROHS3-compliant variants or Eaton MDL series parts. For legacy systems without compliance constraints, all listed substitutes are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the 03136.25H?

A: Yes. All listed substitute parts maintain identical current rating (6.25 A), voltage rating (250 V AC), response time (slow blow), package format (3AB/3AG, 1/4" x 1-1/4"), and breaking capacity (200 A). Physical and electrical interchangeability is guaranteed within the specified parameters.

Q: What is the difference between Littelfuse and Eaton fuses in this list?

A: Both manufacturers produce functionally equivalent 6.25 A, 250 V slow-blow cartridge fuses in the 3AB/3AG package. The primary differences are in product status (all are active), compliance certifications, and secondary electrical characteristics such as melting I²t and DC cold resistance. Selection between manufacturers depends on supply chain preferences and compliance requirements.

Q: Are there RoHS compliance differences I should consider?

A: Yes. Littelfuse parts (03136.25HXP, 03136.25HXIDP, 03136.25MXP, 03136.25VXIDP, 03136.25VXP) and Eaton parts (BK/MDL-6-1/4-R, MDL-6-1/4-R) are ROHS3 compliant. The original 03136.25H and Eaton BK/MDQ-6-1/4 are RoHS non-compliant. For new designs or systems requiring RoHS compliance, select from the compliant alternatives.

Q: Does the fuse holder compatibility change between these parts?

A: No. All substitute parts require the same 3AB/3AG fuse holder as the original 03136.25H. Physical dimensions (1/4" x 1-1/4" or 6.35mm x 31.75mm) are identical across all listed parts.

Q: What approval agencies certify these fuses?

A: Littelfuse substitutes carry CE, CSA, K-MARK, PSE, and UL certifications. Eaton substitutes carry CE, CSA, and UL certifications. All parts meet the approval requirements for general-purpose circuit protection applications in their respective markets.

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