KTK-5 Equivalent & Substitute Parts Reference

Part Overview

The KTK-5 is a 5A 600VAC fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This midget-class fuse (5AG, 10mm x 38mm) is designed for electrical and industrial applications requiring overcurrent protection in AC circuits. The part maintains active product status with 1056 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 fuse holders.

Substiute Parts

KTK-5

Eaton - Bussmann Electrical DivisionIn Stock: 1112KTK-5 Datasheet

Current PartRFQ

0KLK005.T

Littelfuse Inc.In Stock: 8190KLK005.T Datasheet

DirectRFQ

KLKR005.T

Littelfuse Inc.In Stock: 991KLKR005.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTK-5 is determined by the following criteria:

• Current Rating: Must be 5A
• 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)
• Approval Certifications: Must include CSA and UL approval

Two substitute parts meet these criteria: 0KLK005.T (Littelfuse POWR-GARD® KLK series) and KLKR005.T (Littelfuse POWR-GARD® KLKR series). Both maintain identical AC voltage ratings, current ratings, physical dimensions, and fuse classification. Additional DC voltage ratings and breaking capacity specifications in substitute parts do not preclude AC-only applications.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are qualified for direct replacement in applications requiring 5A 600VAC cartridge fuse protection:

0KLK005.T (Littelfuse POWR-GARD® KLK): This substitute maintains identical AC electrical specifications and breaking capacity (100kA) to the KTK-5. It carries CSA and UL certifications alongside CE and QPL approvals, providing expanded regulatory coverage. The addition of 500VDC rating extends application scope without affecting AC-only circuit performance.

KLKR005.T (Littelfuse POWR-GARD® KLKR): This substitute meets all AC electrical requirements with enhanced breaking capacity (200kA AC) and CC class designation. It carries CSA and UL certifications with CE approval. The 300VDC rating and higher breaking capacity provide additional margin in applications with transient conditions or future circuit modifications.

Both parts are active products with current inventory availability. Selection between substitutes depends on application-specific requirements for DC voltage capability and breaking capacity margin.

Frequently Asked Questions (FAQ)

Q: Can 0KLK005.T or KLKR005.T be used as direct replacements for KTK-5 in existing equipment?

A: Yes. Both substitute parts share identical current rating (5A), AC voltage rating (600VAC), fuse type (Cartridge), response time (Fast Blow), and physical dimensions (5AG, 10mm x 38mm). They fit standard 5AG fuse holders without modification and maintain required CSA and UL certifications.

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

A: 0KLK005.T and KLKR005.T differ in DC voltage rating (500VDC vs. 300VDC), breaking capacity (100kA AC vs. 200kA AC), and class designation (unspecified vs. CC). For AC-only applications, both are functionally equivalent. KLKR005.T provides higher breaking capacity and CC class rating for applications requiring enhanced protection margins.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All three parts conform to the 5AG midget cartridge standard with dimensions of 0.406" Dia x 1.500" L (approximately 10.30mm x 38.10mm). Dimensional tolerance variations (10.30mm vs. 10.31mm) are within manufacturing specification and do not affect holder compatibility.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both 0KLK005.T and KLKR005.T are ROHS3 Compliant, matching the environmental compliance status of the KTK-5.

Q: Which substitute should be selected for new designs?

A: Selection depends on circuit requirements. For standard AC protection circuits, either substitute is acceptable. If the circuit may encounter DC transients or requires higher breaking capacity margin, KLKR005.T is the appropriate choice. Consult circuit design specifications and equipment manufacturer guidance for final selection.