Eaton Bussmann KAA-20 Fuse Cartridge Equivalent & Substitute Parts

Part Overview

The Eaton Bussmann KAA-20 is a 20A 130VAC fast-blow cartridge fuse in the Tron® KAA series, designed for applications requiring a 5AG midget form factor (10mm x 38mm). This part is classified as obsolete, making identification of suitable substitute components essential for system maintenance and component replacement in existing installations.

The KAA-20 requires a dedicated fuse holder for operation and is rated for 130VAC applications with fast-blow response characteristics. Due to its obsolete status, sourcing direct replacements may present supply chain challenges, necessitating evaluation of compatible alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

KAA-20

Eaton - Bussmann Electrical DivisionIn Stock: 1204KAA-20 Datasheet

Current PartRFQ

FWA-20A10F

Eaton - Bussmann Electrical DivisionIn Stock: 920FWA-20A10F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KAA-20 is determined by the following critical parameters that must be maintained or exceeded:

Mandatory Compatibility Parameters:

• Current Rating: 20A (exact match required)
• Package / Case: 5AG, 10mm x 38mm midget form factor (physical and electrical compatibility with existing holders)
• Mounting Type: Requires Holder (same installation method)
• Voltage Rating - AC: Must equal or exceed 130VAC

Acceptable Variation Parameters:

• Voltage Rating - DC: May be present in substitute parts without affecting AC-only applications
• Breaking Capacity: Higher values are acceptable and provide enhanced performance margins
• Approval Agencies: Additional certifications (CE, UR) enhance suitability without compromising compatibility

The FWA-20A10F meets all mandatory compatibility requirements while providing enhanced electrical ratings and active product status, making it a direct functional substitute for the obsolete KAA-20.

Parameter Comparison

Engineering Selection Recommendations

The FWA-20A10F is the designated substitute for the obsolete KAA-20 based on the following engineering criteria:

Electrical Compatibility: The FWA-20A10F maintains the 20A current rating and exceeds the AC voltage requirement (150VAC vs. 130VAC), ensuring safe operation in the original application circuit. The addition of 150VDC rating provides flexibility for future applications without compromising AC performance.

Physical Compatibility: Both parts share identical 5AG midget form factor dimensions (10mm x 38mm), ensuring direct mechanical compatibility with existing fuse holders without modification or adapter requirements.

Product Status & Supply Chain: The FWA-20A10F holds active product status with documented inventory availability (838 pcs), addressing the supply chain limitations of the obsolete KAA-20 (1113 pcs remaining stock).

Regulatory Compliance: The FWA-20A10F carries CE and UR approvals with ROHS3 compliance, meeting modern regulatory requirements while maintaining REACH unaffected status consistent with the original part.

Performance Enhancement: The specified 100kA breaking capacity provides a defined performance margin not documented for the KAA-20, supporting reliable operation in industrial and electrical applications.

Frequently Asked Questions (FAQ)

Q: Can the FWA-20A10F be used as a direct replacement for the KAA-20 in existing installations?

A: Yes. Both parts share identical current rating (20A), package form factor (5AG, 10mm x 38mm), and mounting requirements (holder-based installation). The FWA-20A10F's 150VAC rating exceeds the KAA-20's 130VAC requirement, ensuring compatibility in the original circuit.

Q: What is the significance of the FWA-20A10F's 150VDC rating when the original application is AC-only?

A: The DC rating does not affect AC operation. It indicates the part's capability to handle both AC and DC applications, providing design flexibility for future modifications without requiring component changes.

Q: Are there physical dimension differences between these parts?

A: Both parts conform to the 5AG midget standard with nominal dimensions of 10mm x 38mm. The FWA-20A10F shows a length of 10.30mm x 38.10mm versus the KAA-20's 10.30mm x 38.00mm—a 0.10mm difference within manufacturing tolerance that does not affect holder compatibility.

Q: What does the 100kA breaking capacity specification mean for the FWA-20A10F?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt at its rated voltage without rupturing or creating hazardous conditions. The 100kA specification for the FWA-20A10F provides a documented performance margin for industrial and electrical applications.

Q: Why is the KAA-20 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The FWA-20A10F represents the active equivalent, ensuring continued availability and support for replacement requirements.

Q: Are there any compliance differences between the KAA-20 and FWA-20A10F?

A: The FWA-20A10F carries additional certifications (CE, UR) and ROHS3 compliance, meeting current regulatory standards. Both parts maintain REACH unaffected status. These enhancements do not compromise compatibility with the original KAA-20 application.