Littelfuse 0303020.M Glass Cartridge Fuse 20A 32VAC 7AG

Part Overview

The Littelfuse 0303020.M is a 20A 32V AC/DC glass cartridge fuse in the 7AG form factor (1/4" x 7/8"). This medium-blow fuse is designed for applications requiring holder-based installation and is currently in active production status. Alternative equivalent parts may be necessary due to inventory availability, regional sourcing requirements, or specific application performance characteristics.

Substiute Parts

0303020.M

Littelfuse Inc.In Stock: 7340303020.M Datasheet

Current PartRFQ

AGW-20

Eaton - Electronics DivisionIn Stock: 1003AGW-20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Equivalent substitution for the Littelfuse 0303020.M is determined by strict alignment of the following electrical and mechanical parameters:

• Current Rating: 20 A (exact match required)
• Voltage Rating (AC): 32 V (exact match required)
• Package / Case: 7AG, 1/4" x 7/8" (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Requires Holder (exact match required)

The Eaton AGW-20 meets all substitution criteria. While the AGW-20 exhibits a Fast Blow response characteristic compared to the Medium Blow of the 0303020.M, both parts share identical electrical ratings, physical form factor, and holder compatibility. The response time difference reflects distinct product series design but does not preclude functional equivalence in applications where the 20A 32V protection threshold is the primary selection criterion.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0303020.M and Eaton AGW-20 are active production components with identical electrical ratings (20A, 32V AC/DC) and compatible 7AG form factors. Selection between these parts should be based on:

• Application response time requirements: The 0303020.M (Medium Blow) provides delayed response suitable for circuits with inrush current tolerance. The AGW-20 (Fast Blow) provides rapid response for circuits requiring immediate fault isolation.
• Inventory and lead time considerations: Both manufacturers maintain active stock.
• Mechanical fit verification: The AGW-20 length (0.875" L) is marginally longer than the 0303020.M (0.812" L). Confirm holder clearance in space-constrained applications.
• Regulatory compliance: Both parts are RoHS non-compliant and carry identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can the Eaton AGW-20 directly replace the Littelfuse 0303020.M in existing designs?

A: Direct mechanical and electrical replacement is possible due to identical current rating (20A), voltage rating (32V AC/DC), and 7AG package compatibility. However, the AGW-20 Fast Blow response differs from the 0303020.M Medium Blow characteristic. Verify that the application circuit design accommodates the faster response time before substitution.

Q: What is the significance of the response time difference between Medium Blow and Fast Blow?

A: Response time defines the fuse's thermal and magnetic trip characteristics. Medium Blow fuses tolerate brief overcurrent transients before opening, suitable for inductive loads. Fast Blow fuses open rapidly at rated current, suitable for sensitive electronic circuits. Application requirements determine which response type is appropriate.

Q: Are there dimensional compatibility concerns with the AGW-20 substitute?

A: The AGW-20 is 0.063" (1.6mm) longer than the 0303020.M. Both use the same 7AG holder interface. Confirm that the fuse holder cavity provides adequate clearance for the AGW-20 length, particularly in compact enclosures.

Q: Do both parts meet the same regulatory and compliance standards?

A: Both the 0303020.M and AGW-20 are RoHS non-compliant and share identical ECCN (EAR99) and HTSUS (8536.10.0020) classifications. No compliance advantage exists between the two parts.

Q: What is the breaking capacity specification and why does it matter?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The AGW-20 specifies 1 kA breaking capacity. The 0303020.M does not provide this specification. For applications with high fault current potential, the AGW-20 documented breaking capacity provides additional assurance of safe operation.