Littelfuse 030107.5H Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 030107.5H is a 7.5 A, 32 V AC/DC glass cartridge fuse in the 1AG package format (1/4" x 5/8"). This fuse is designed for medium-blow response applications requiring holder-based mounting. The part is currently active in production with 716 units in stock. Glass cartridge fuses of this specification are essential components in electrical protection circuits where precise current interruption and voltage containment are required.

Substiute Parts

030107.5H

Littelfuse Inc.In Stock: 788030107.5H Datasheet

Current PartRFQ

AGA-7-1/2

Eaton - Electronics DivisionIn Stock: 934AGA-7-1/2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 030107.5H is determined by the following critical parameters:

• Current Rating: Must be 7.5 A (exact match required)
• Package / Case: Must be 1AG, 1/4" x 5/8" (physical and electrical compatibility)
• Fuse Type: Must be Cartridge, Glass (functional equivalence)
• Mounting Type: Must be Requires Holder (mechanical compatibility)

The Eaton AGA-7-1/2 meets these core substitution criteria. However, differences exist in voltage rating (125 V vs. 32 V) and response time characteristics (Fast Blow vs. Medium Blow), which affect application suitability and must be evaluated for specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 030107.5H is the primary choice for applications requiring RoHS3 compliance and medium-blow response characteristics at 32 V AC/DC operation. This part is actively manufactured and maintains full regulatory compliance.

Eaton AGA-7-1/2 serves as a substitute where voltage rating elevation to 125 V is acceptable and RoHS compliance is not a requirement. The fast-blow response time and higher breaking capacity (1 kA) make this part suitable for circuits where faster fault interruption is beneficial. Selection of this substitute requires confirmation that the higher voltage rating and different response time do not conflict with circuit design specifications.

Frequently Asked Questions (FAQ)

Q: Can the Eaton AGA-7-1/2 be used in place of the Littelfuse 030107.5H in all applications?

A: No. While both fuses share identical current rating (7.5 A) and package format (1AG), the Eaton part operates at 125 V AC versus 32 V AC for the Littelfuse part. The Eaton fuse also exhibits fast-blow response instead of medium-blow. Substitution is only valid where the circuit voltage rating is 125 V or lower and fast-blow response is compatible with the application.

Q: Are the physical dimensions identical between these fuses?

A: Yes. Both fuses use the 1AG package format with dimensions of 1/4" diameter x 5/8" length (6.35mm x 15.88mm). Both require a compatible fuse holder for installation.

Q: What is the significance of the response time difference (Medium Blow vs. Fast Blow)?

A: Response time determines how quickly the fuse element melts under overcurrent conditions. Medium-blow fuses tolerate brief inrush currents before interruption, while fast-blow fuses interrupt more rapidly. The appropriate choice depends on the circuit's inrush current profile and protection requirements.

Q: Does RoHS compliance matter for my application?

A: RoHS compliance is mandatory for products sold in the European Union and for many industrial and consumer applications. The Littelfuse 030107.5H is RoHS3 compliant, while the Eaton AGA-7-1/2 is not. Verify regulatory requirements for your end application before selecting a non-compliant substitute.

Q: What does the breaking capacity specification mean?

A: Breaking capacity (1 kA for the Eaton part) indicates the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The Littelfuse specification does not provide this value; verify that your circuit's maximum fault current does not exceed the fuse's breaking capacity.