KTK-20 Equivalent & Substitute Parts

Part Overview

The KTK-20 is a 20A 600VAC fast-blow fuse cartridge 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 2570 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements permit equivalent functionality.

Substiute Parts

KTK-20

Eaton - Bussmann Electrical DivisionIn Stock: 2638KTK-20 Datasheet

Current PartRFQ

KLKR020.T

Littelfuse Inc.In Stock: 1230KLKR020.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KTK-20 is based on the following critical parameters that must remain constant or compatible:

• Current Rating: Must be 20A
• Voltage Rating - AC: Must be 600 VAC minimum
• Fuse Type: Must be Cartridge
• Package / Case: Must be 5AG, 10mm x 38mm (Midget)
• Physical Dimensions: Must be 0.406" Dia x 1.500" L
• Response Time: Must be Fast Blow
• Approval Agencies: Must include CSA and/or UL certification

The substitute part KLKR020.T meets all mandatory parameters for direct substitution in AC applications. Additional DC voltage capability (300 VDC) and higher breaking capacity do not prevent substitution in AC-only circuits.

Parameter Comparison

Engineering Selection Recommendations

Both the KTK-20 and KLKR020.T are active products with current manufacturing status and full regulatory compliance. Selection between these parts should be based on:

KTK-20: Primary choice when Eaton - Bussmann sourcing is preferred or when design specifications explicitly require this manufacturer's product line.

KLKR020.T: Suitable alternative when Littelfuse sourcing is acceptable. This part provides equivalent AC circuit protection with identical electrical and mechanical parameters. The higher breaking capacity (200kA AC versus 100kA) and additional DC voltage rating do not compromise AC-only applications. Both parts carry CSA and UL certifications required for industrial and electrical applications.

Frequently Asked Questions (FAQ)

Q: Can KLKR020.T be used as a direct replacement for KTK-20 in existing installations?

A: Yes. Both parts share identical current rating (20A), AC voltage rating (600 VAC), response time (Fast Blow), fuse type (Cartridge), and physical dimensions (5AG, 10mm x 38mm). Both are CSA and UL certified. Physical installation in the same holder is compatible.

Q: What is the difference in breaking capacity between these parts?

A: The KTK-20 has a breaking capacity of 100kA at rated voltage. The KLKR020.T has 200kA AC breaking capacity. Higher breaking capacity does not affect performance in circuits designed for the lower rating and does not create compatibility issues.

Q: Does the KLKR020.T's DC voltage rating affect AC circuit operation?

A: No. The 300 VDC rating on KLKR020.T is an additional capability that does not impact AC circuit performance. In AC-only applications, this parameter is not utilized.

Q: Are both parts RoHS compliant?

A: Yes. Both KTK-20 and KLKR020.T are ROHS3 Compliant.

Q: What certifications do these parts carry?

A: KTK-20 carries CSA and UL certifications. KLKR020.T carries CE, CSA, and UL certifications. Both meet the regulatory requirements for industrial and electrical applications in North American markets.