KTK-3/10 Equivalent & Substitute Parts

Part Overview

The KTK-3/10 is a 300mA fast-blow cartridge fuse rated for 600 VAC operation, manufactured by Eaton - Bussmann Electrical Division. This component is designed for use in electrical and industrial applications requiring a holder-mounted fuse element. The part maintains active product status with 739 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 compatible holder assemblies.

Substiute Parts

KTK-3/10

Eaton - Bussmann Electrical DivisionIn Stock: 809KTK-3/10 Datasheet

Current PartRFQ

KLKR.300T

Littelfuse Inc.In Stock: 958KLKR.300T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTK-3/10 is determined by strict alignment of the following parameters:

• Current Rating: 300mA (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 KLKR.300T from Littelfuse Inc. satisfies all primary substitution criteria. Additional electrical ratings (300 VDC capability) and enhanced breaking capacity do not disqualify this part as a substitute, as these represent equal or superior performance characteristics within the same mechanical and primary electrical envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the KTK-3/10 and KLKR.300T maintain active product status and carry relevant regulatory approvals (CSA, UL). The KLKR.300T provides additional certification coverage (CE) and enhanced RoHS compliance (ROHS3). The substitute part delivers equivalent performance in AC applications at the specified 600 VAC, 300mA rating with identical mechanical form factor. The KLKR.300T's higher breaking capacity (200kA AC versus 100kA) and DC voltage rating represent supplementary capabilities that do not compromise compatibility in circuits designed for the original KTK-3/10 specification.

Frequently Asked Questions (FAQ)

Q: Can the KLKR.300T be used directly in place of the KTK-3/10?

A: Yes. Both parts share identical current rating (300mA), AC voltage rating (600 VAC), response time (Fast Blow), and mechanical dimensions (5AG, 10mm x 38mm). Both require the same holder assembly and are approved by CSA and UL.

Q: What is the significance of the KLKR.300T's 300 VDC rating?

A: The KTK-3/10 specification does not include a DC voltage rating. The KLKR.300T's 300 VDC capability is an additional feature that does not affect AC-only applications. In circuits operating exclusively at 600 VAC, this parameter is not a selection factor.

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

A: The KTK-3/10 has a breaking capacity of 100kA at rated voltage. The KLKR.300T provides 200kA AC breaking capacity. Higher breaking capacity indicates enhanced fault current handling capability and does not create incompatibility in applications designed for the original part.

Q: Do both parts meet the same regulatory standards?

A: Both parts carry CSA and UL approvals. The KLKR.300T additionally holds CE certification and meets ROHS3 compliance, compared to the KTK-3/10's RoHS Compliant status. These represent equal or enhanced regulatory coverage.

Q: What holder assembly is required for these fuses?

A: Both the KTK-3/10 and KLKR.300T are 5AG cartridge fuses with 10mm x 38mm (Midget) dimensions. They require a compatible 5AG holder assembly rated for the same voltage and current specifications.