KTK-1 Equivalent & Substitute Parts Reference

Part Overview

The KTK-1 is a 1A 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-based installation. The part maintains active product status with 1035 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification, enabling direct functional replacement in applications where the main part becomes unavailable or when alternative sourcing is required.

Substiute Parts

KTK-1

Eaton - Bussmann Electrical DivisionIn Stock: 1056KTK-1 Datasheet

Current PartRFQ

0KLK001.T

Littelfuse Inc.In Stock: 12810KLK001.T Datasheet

DirectRFQ

KLKR001.T

LittelfuseIn Stock: 1457KLKR001.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTK-1 is determined by the following critical parameters:

• Current Rating: Must be 1A
• AC Voltage Rating: 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-based installation
• Approval Certifications: Must include CSA and UL approval

Both identified substitute parts (0KLK001.T and KLKR001.T) satisfy these core electrical and mechanical requirements. Additional parameters such as DC voltage rating and breaking capacity at rated voltage represent extended capabilities that do not preclude substitution when AC-only operation is the application requirement.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and carry the required CSA and UL certifications necessary for electrical and industrial applications. The 0KLK001.T (Littelfuse POWR-GARD® KLK series) provides equivalent AC performance with extended DC capability (500 VDC) and includes QPL approval. The KLKR001.T (Littelfuse POWR-GARD® KLKR series) offers enhanced breaking capacity at rated AC voltage (200kA versus 100kA) with Class CC designation, providing additional protection margin in high-fault-current environments.

Selection between substitutes depends on application-specific requirements: choose 0KLK001.T for applications requiring dual AC/DC voltage operation; select KLKR001.T when higher breaking capacity and Class CC performance are specified. Both parts are mechanically and electrically compatible with the KTK-1 for AC 600VAC 1A applications.

Frequently Asked Questions (FAQ)

Q: Can 0KLK001.T or KLKR001.T be used as direct replacements for KTK-1 in existing installations?

A: Yes. Both substitute parts match the critical electrical parameters (1A, 600 VAC, fast-blow response) and physical dimensions (5AG, 10mm x 38mm midget cartridge). They install in the same holder without modification and carry equivalent CSA and UL certifications.

Q: What is the difference between the two substitute options?

A: The 0KLK001.T adds 500 VDC capability and QPL approval, making it suitable for dual-voltage applications. The KLKR001.T provides double the breaking capacity (200kA AC) and Class CC designation, offering enhanced protection in high-fault-current circuits. For AC-only 600VAC applications, both are functionally equivalent to the KTK-1.

Q: Are there any packaging differences between KTK-1 and the substitutes?

A: The KTK-1 is supplied in bulk packaging, while KLKR001.T is supplied in box packaging. The 0KLK001.T is supplied in bulk packaging. Physical cartridge dimensions and holder compatibility remain identical across all three parts.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both 0KLK001.T and KLKR001.T are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the KTK-1.

Q: Which substitute should be selected for new designs?

A: Selection is based on application voltage requirements and fault-current environment. For standard AC 600VAC circuits, either substitute is appropriate. For circuits with high fault current potential, KLKR001.T with 200kA breaking capacity is preferred. For applications requiring future DC capability, 0KLK001.T is the better choice.