KAA-25 Equivalent & Substitute Parts Reference

Part Overview

The KAA-25 is a 25A 130VAC fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division, part of the Tron® KAA series. This component is classified as obsolete, requiring identification of active equivalent parts for continued system support and procurement. The 5AG cartridge format (10mm x 38mm) with fast-blow response characteristics serves applications requiring rapid overcurrent protection in AC electrical circuits rated at 130VAC.

Substiute Parts

KAA-25

Eaton - Bussmann Electrical DivisionIn Stock: 986KAA-25 Datasheet

Current PartRFQ

FWA-25A10F

Eaton - Bussmann Electrical DivisionIn Stock: 766FWA-25A10F Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KAA-25 is determined by the following critical parameters:

• Current Rating: Must be 25A to maintain circuit protection design specifications
• Package / Case Format: Must be 5AG cartridge (10mm x 38mm) for mechanical compatibility with existing holders
• Voltage Rating: Must support minimum 130VAC operation; higher voltage ratings provide expanded application flexibility
• Fuse Type: Must remain cartridge format with holder-based mounting
• Response Time: Fast-blow characteristic must be maintained for intended overcurrent protection function

The FWA-25A10F meets all substitution criteria while providing enhanced specifications including dual AC/DC voltage rating (150VAC/150VDC), active product status, and regulatory certifications (CE, UR).

Parameter Comparison

Engineering Selection Recommendations

The FWA-25A10F is the direct substitute for the obsolete KAA-25. Selection is based on:

• Functional Equivalence: Identical 25A current rating and 5AG cartridge package ensure direct mechanical and electrical compatibility with existing KAA-25 holders and circuit designs
• Voltage Compatibility: The 150VAC rating of FWA-25A10F exceeds the 130VAC requirement of the original KAA-25, providing margin for system operation
• Active Product Status: FWA-25A10F is an active product with current manufacturing support and availability, eliminating obsolescence risk
• Regulatory Compliance: FWA-25A10F carries CE and UR certifications with RoHS compliance, meeting modern regulatory requirements
• Specified Performance: Breaking capacity of 100kA at rated voltage is documented for the FWA-25A10F, providing defined fault protection performance

Frequently Asked Questions (FAQ)

Q: Can the FWA-25A10F be used as a direct replacement for the KAA-25 in existing equipment?

A: Yes. Both parts share identical current rating (25A), cartridge fuse type, and 5AG package format (10mm x 38mm). The FWA-25A10F is mechanically and electrically compatible with KAA-25 holders. The higher voltage rating (150VAC vs. 130VAC) does not prevent substitution in 130VAC circuits.

Q: What is the significance of the 5AG package designation?

A: The 5AG designation identifies the cartridge fuse package as a midget format with 10mm diameter and 38mm length. This standardized package ensures mechanical compatibility with 5AG-rated fuse holders. Both KAA-25 and FWA-25A10F conform to this specification.

Q: Does the FWA-25A10F support DC applications?

A: Yes. The FWA-25A10F is rated for 150VDC operation, whereas the KAA-25 specification does not include a DC voltage rating. This expanded capability allows the FWA-25A10F to serve both AC and DC circuit protection applications.

Q: What certifications apply to the FWA-25A10F?

A: The FWA-25A10F carries CE and UR approvals and is RoHS compliant. These certifications indicate conformance to European and North American safety standards and environmental regulations.

Q: Are there inventory considerations for this substitution?

A: The FWA-25A10F is an active product with current stock availability (685 Pcs reported). The KAA-25 is obsolete with limited remaining inventory (876 Pcs). For new designs and long-term procurement, the FWA-25A10F is the appropriate selection.