Littelfuse 0313025.H Glass Cartridge Fuse 25A 32VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0313025.H is a 25 A, 32 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG form factor (1/4" × 1-1/4"). This part is classified as obsolete. Equivalent and substitute parts are available from Littelfuse and Eaton to maintain circuit protection functionality in applications requiring this current and voltage rating with identical mechanical and electrical characteristics.

Key Parameters

Parameter	Value
Current Rating	25 A
Voltage Rating (AC)	32 V
Response Time	Slow Blow
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" × 1-1/4"
Breaking Capacity @ Rated Voltage	300 A (Littelfuse); 1 kA (Eaton)
Melting I²t	16500 (Littelfuse); 15221 (Eaton)
Size / Dimension	0.250" Dia × 1.250" L (6.35 mm × 31.75 mm)
Approval Agency	UL (Littelfuse); CSA, UL (Eaton)

Substitute Part Grouping Explanation

Substitution is determined by matching the following critical parameters:

Current Rating: 25 A
Voltage Rating (AC): 32 V
Response Time: Slow Blow
Fuse Type: Cartridge, Glass
Package / Case: 3AB, 3AG, 1/4" × 1-1/4"
Mounting Type: Requires Holder

All substitute parts listed maintain these core electrical and mechanical specifications. Littelfuse parts 0313025.HXP, 0313025.MXP, and 0313025.VXP are direct parametric equivalents from the same manufacturer. Eaton parts MDL-25 and BK/MDL-25 are cross-manufacturer parametric equivalents meeting the same functional requirements.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Response Time	Breaking Capacity	Melting I²t	Product Status	RoHS Status
0313025.H	Littelfuse Inc.	25	32	Slow Blow	300 A	16500	Obsolete	Non-compliant
0313025.HXP	Littelfuse Inc.	25	32	Slow Blow	300 A	16500	Active	ROHS3 Compliant
0313025.MXP	Littelfuse Inc.	25	32	Slow Blow	300 A	16500	Active	ROHS3 Compliant
0313025.VXP	Littelfuse Inc.	25	32	Slow Blow	300 A	16500	Active	ROHS3 Compliant
MDL-25	Eaton - Electronics Division	25	32	Slow Blow	1 kA	15221	Active	Non-compliant
BK/MDL-25	Eaton - Electronics Division	25	32	Slow Blow	1 kA	15221	Active	Non-compliant

Engineering Selection Recommendations

Littelfuse Direct Replacements (0313025.HXP, 0313025.MXP, 0313025.VXP): These parts are active production equivalents from the original manufacturer with identical electrical specifications. Parts 0313025.HXP and 0313025.MXP are ROHS3 compliant and recommended for new designs or applications requiring RoHS compliance. All three Littelfuse substitutes maintain the 300 A breaking capacity and 16500 melting I²t of the original part.

Eaton Cross-Manufacturer Alternatives (MDL-25, BK/MDL-25): These parts meet the core functional requirements (25 A, 32 V, slow-blow, 3AB/3AG form factor) and carry UL and CSA approvals. The Eaton parts feature a higher breaking capacity of 1 kA. Both MDL-25 and BK/MDL-25 are non-RoHS compliant. Selection between MDL-25 and BK/MDL-25 depends on application-specific requirements and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can 0313025.HXP, 0313025.MXP, and 0313025.VXP be used interchangeably with 0313025.H?

A: Yes. All three parts are parametric equivalents with identical current rating (25 A), voltage rating (32 V), response time (slow-blow), and mechanical form factor (3AB/3AG, 1/4" × 1-1/4"). The primary difference is product status and RoHS compliance; the Littelfuse substitutes are active production parts.

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

A: Both manufacturers provide 25 A, 32 V slow-blow cartridge fuses in the 3AB/3AG form factor. Littelfuse parts maintain a 300 A breaking capacity, while Eaton MDL series parts provide 1 kA breaking capacity. Melting I²t values differ slightly (16500 for Littelfuse, 15221 for Eaton). Both carry UL approval; Eaton parts also carry CSA approval.

Q: Are the Eaton MDL-25 and BK/MDL-25 truly equivalent?

A: Both Eaton parts share identical electrical specifications (25 A, 32 V, slow-blow, 1 kA breaking capacity, 15221 melting I²t) and mechanical form factor. Selection between them is based on packaging preference (both bulk) and application requirements.

Q: Does the higher breaking capacity of Eaton fuses affect compatibility?

A: No. The 1 kA breaking capacity of Eaton parts exceeds the 300 A specification of the original Littelfuse part, providing equal or greater protection capability. This does not compromise compatibility in applications designed for the original part.

Q: What is the significance of RoHS compliance in this product line?

A: Littelfuse 0313025.HXP, 0313025.MXP, and 0313025.VXP are ROHS3 compliant, meeting current environmental regulations. The original 0313025.H and Eaton MDL series parts are non-compliant. RoHS compliance is a regulatory requirement for many applications and markets.

Q: Can I use these fuses in any holder rated for 3AB/3AG form factor?

A: Yes. All parts listed are designed for 3AB/3AG holders with 1/4" × 1-1/4" mechanical dimensions. Compatibility is determined by holder specification, not individual fuse variant.

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