KTK-9 Equivalent & Substitute Parts

Part Overview

The KTK-9 is a 9A 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 fuse operates at 600 VAC with a breaking capacity of 100kA at rated voltage and requires a compatible fuse holder for installation. The product maintains active status with 963 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct replacement in existing installations.

Substiute Parts

KTK-9

Eaton - Bussmann Electrical DivisionIn Stock: 994KTK-9 Datasheet

Current PartRFQ

KLKR009.T

Littelfuse Inc.In Stock: 1202KLKR009.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTK-9 is determined by the following critical parameters:

• Current Rating: Must be 9A
• Voltage Rating - AC: Must be 600 VAC minimum
• Fuse Type: Must be Cartridge
• Response Time: Must be Fast Blow
• Package / Case: Must be 5AG, 10mm x 38mm (Midget)
• Physical Dimensions: Must be 0.406" Dia x 1.500" L (10.30mm x 38.10mm)
• Mounting Type: Must require holder (no change in installation method)
• Approval Certifications: Must include CSA and UL certifications

The substitute part KLKR009.T meets all mandatory electrical and mechanical parameters. Additional capabilities such as DC voltage rating (300 VDC) and higher breaking capacity (200kA AC, 20kA DC) do not disqualify substitution, as these represent enhanced performance characteristics within the same physical and electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the KTK-9 and KLKR009.T are active products with current manufacturer support. The KTK-9 maintains CSA and UL certifications required for North American installations. The KLKR009.T provides equivalent AC performance with additional CE certification for European markets and enhanced DC capability. Selection between these parts should be based on circuit requirements and regional compliance mandates. Both components satisfy RoHS environmental compliance standards and are available in production quantities.

Frequently Asked Questions (FAQ)

Q: Can KLKR009.T replace KTK-9 in existing installations?

A: Yes. Both parts share identical current rating (9A), AC voltage rating (600 VAC), response time (Fast Blow), physical dimensions (0.406" Dia x 1.500" L), and package type (5AG Midget). Both require the same holder type and fit the same mechanical envelope.

Q: What is the significance of the DC voltage rating on KLKR009.T?

A: The KLKR009.T includes a 300 VDC rating, which the KTK-9 specification does not address. This additional capability does not affect AC circuit performance and represents enhanced versatility for mixed-voltage applications.

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

A: Yes. The KTK-9 has a breaking capacity of 100kA at 600 VAC, while the KLKR009.T provides 200kA AC and 20kA DC. Higher breaking capacity indicates superior fault current handling capability and does not compromise compatibility in circuits designed for the lower rating.

Q: Do certification differences affect substitution?

A: The KTK-9 carries CSA and UL certifications. The KLKR009.T carries CE, CSA, and UL certifications. For North American applications requiring CSA/UL compliance, both parts are acceptable. The KLKR009.T provides additional CE certification for European regulatory compliance.

Q: Is packaging format identical between these parts?

A: Both parts use 5AG package format with 10mm x 38mm (Midget) dimensions. Physical interchangeability is confirmed. Packaging type differs (KTK-9 supplied in Bulk; KLKR009.T supplied in Box), but this affects only procurement and storage, not functional compatibility.