KTK-3-1/2 Equivalent & Substitute Parts

Part Overview

The KTK-3-1/2 is a 4.6A 600VAC fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This component is designed for electrical and industrial applications requiring overcurrent protection in AC circuits. The part is currently active in production with 808 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in holder-based installations.

Substiute Parts

KTK-3-1/2

Eaton - Bussmann Electrical DivisionIn Stock: 833KTK-3-1/2 Datasheet

Current PartRFQ

KLKR03.5T

Littelfuse Inc.In Stock: 1018KLKR03.5T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KTK-3-1/2 is determined by strict equivalence in the following parameters:

• Current Rating: 4.6A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5AG, 10mm x 38mm (Midget) (exact match required)
• Physical Dimensions: 0.406" Dia x 1.500" L (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Requires Holder (exact match required)

The KLKR04.6T from Littelfuse Inc. meets all these criteria and is therefore classified as a direct substitute. Additional capabilities in the substitute part (300 VDC rating, higher breaking capacity, CC class designation) do not disqualify it from substitution; they represent enhanced specifications that maintain backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

The KLKR04.6T is a direct substitute for the KTK-3-1/2 based on electrical and mechanical equivalence. Both parts share identical current ratings, AC voltage ratings, response characteristics, and physical dimensions required for holder compatibility. Both parts maintain active product status and carry CSA and UL approvals, satisfying regulatory requirements for electrical and industrial applications.

The KLKR04.6T provides additional certifications (CE marking) and enhanced breaking capacity specifications, which do not compromise its use as a substitute in applications originally designed for the KTK-3-1/2. The ROHS3 compliance of the substitute part exceeds the RoHS compliance of the original part.

Frequently Asked Questions (FAQ)

Q: Can the KLKR04.6T replace the KTK-3-1/2 in existing installations?

A: Yes. Both parts are 4.6A, 600 VAC, fast-blow cartridge fuses in the 5AG package with identical physical dimensions (0.406" Dia x 1.500" L). They are mechanically and electrically interchangeable in holder-based applications.

Q: Are there differences in breaking capacity between these parts?

A: The KLKR04.6T has a higher breaking capacity (200kA AC) compared to the KTK-3-1/2 (100kA). This enhanced rating does not prevent substitution; it indicates the substitute part can handle higher fault currents without degradation.

Q: Does the KLKR04.6T's 300 VDC rating affect its use in 600 VAC applications?

A: No. The 300 VDC rating is an additional capability of the KLKR04.6T. The part is fully rated for 600 VAC operation and is suitable for AC-only applications.

Q: Are both parts RoHS compliant?

A: Yes. The KTK-3-1/2 is RoHS Compliant. The KLKR04.6T is ROHS3 Compliant, which represents a more recent compliance standard and does not affect substitution eligibility.

Q: What approvals do these parts carry?

A: The KTK-3-1/2 carries CSA and UL approvals. The KLKR04.6T carries CE, CSA, and UL approvals. Both meet the regulatory requirements for electrical and industrial applications in their respective markets.