Equivalent & Substitute Parts for KTK-3 Fuse Cartridge

Part Overview

The KTK-3 is a 3A 600VAC fast-blow fuse cartridge manufactured by Eaton - Bussmann Electrical Division. This midget cartridge fuse (5AG, 10mm x 38mm) is designed for electrical and industrial applications requiring holder-mounted protection. The part is active in production with 880 units in stock. Substitute parts are necessary when sourcing alternatives from different manufacturers or when specific voltage ratings (DC capability) or breaking capacity requirements necessitate component variation.

Substiute Parts

KTK-3

Eaton - Bussmann Electrical DivisionIn Stock: 916KTK-3 Datasheet

Current PartRFQ

0KLK003.T

Littelfuse Inc.In Stock: 11260KLK003.T Datasheet

DirectRFQ

KLKR003.T

Littelfuse Inc.In Stock: 801KLKR003.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTK-3 is determined by the following critical parameters:

• Current Rating: Must be 3A
• Voltage Rating - AC: Must be 600 VAC minimum
• Fuse Type: Must be Cartridge
• Package / Case: Must be 5AG, 10mm x 38mm (Midget)
• Response Time: Must be Fast Blow
• Mounting Type: Must require holder compatibility

The two substitute parts listed (0KLK003.T and KLKR003.T) meet all core substitution criteria. Variations in DC voltage rating and breaking capacity do not preclude substitution when AC operation at 600VAC and 3A is the primary requirement. Both substitutes are manufactured by Littelfuse Inc. and maintain identical physical dimensions and current ratings.

Parameter Comparison

Engineering Selection Recommendations

All three parts are active products with current manufacturing status and full regulatory compliance. Selection between KTK-3 and its substitutes depends on application-specific requirements:

KTK-3 (Eaton - Bussmann): Primary choice when CSA and UL certifications are the sole compliance requirement and AC-only operation is specified. Maintains 100kA breaking capacity at rated voltage.

0KLK003.T (Littelfuse POWR-GARD KLK): Suitable when dual AC/DC operation is required (600VAC/500VDC capability). Includes QPL approval in addition to CE, CSA, and UL certifications. Maintains 100kA AC breaking capacity with 50kA DC capability.

KLKR003.T (Littelfuse POWR-GARD KLKR): Appropriate when higher AC breaking capacity (200kA) is required. Classified as Class CC fuse. Includes CE, CSA, and UL certifications. DC capability limited to 300VDC with 20kA breaking capacity.

All substitutes maintain identical physical dimensions, current rating, AC voltage rating, and fast-blow response characteristics. Interchangeability is confirmed for holder-mounted applications requiring 3A, 600VAC protection.

Frequently Asked Questions (FAQ)

Q: Can 0KLK003.T replace KTK-3 in an AC-only circuit? A: Yes. The 0KLK003.T meets all AC substitution criteria: 3A current rating, 600VAC voltage rating, fast-blow response, 5AG cartridge package, and 100kA breaking capacity at rated voltage. The additional 500VDC rating does not affect AC performance.

Q: What is the difference between 0KLK003.T and KLKR003.T? A: Both are Littelfuse POWR-GARD cartridge fuses with identical AC ratings (3A, 600VAC, fast-blow). Key differences: 0KLK003.T offers 500VDC capability with 100kA AC breaking capacity; KLKR003.T is Class CC rated with 200kA AC breaking capacity but only 300VDC capability. Selection depends on whether DC voltage rating or higher AC breaking capacity is required.

Q: Are physical dimensions identical across all three parts? A: Yes. All three parts use the 5AG midget cartridge package with dimensions 0.406" Dia x 1.500" L (approximately 10.30-10.31mm x 38.10mm). Direct mechanical interchangeability in holder-mounted applications is confirmed.

Q: Which substitute has the broadest regulatory approval? A: The 0KLK003.T includes QPL (Qualified Products List) approval in addition to CE, CSA, and UL certifications, providing the most comprehensive regulatory coverage for military and aerospace applications.

Q: Can KLKR003.T be used if higher breaking capacity is needed? A: Yes, if the application requires 200kA AC breaking capacity. However, this part is limited to 300VDC operation compared to the 500VDC capability of 0KLK003.T. Confirm DC voltage requirements before selection.