KTU-650 Equivalent & Substitute Parts Reference

Part Overview

The KTU-650 is a 650A 600 VAC fast-blow fuse cartridge manufactured by Eaton - Bussmann Electrical Division under the Limitron™ KTU series. This component is designed for bolt-mount installation in electrical and industrial applications requiring high-current protection at 600 VAC. The part maintains active product status with 1078 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and regulatory approvals align with the original specification, enabling procurement flexibility and supply chain continuity.

Substiute Parts

KTU-650

Eaton - Bussmann Electrical DivisionIn Stock: 1100KTU-650 Datasheet

Current PartRFQ

KLPC650.X

Littelfuse Inc.In Stock: 882KLPC650.X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KTU-650 is determined by the following critical parameters:

• Current Rating: 650A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Bolt Mount (exact match required)
• Class: L (exact match required)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (exact match required)
• Size / Dimension: 2.500" Dia x 3.750" L nominal (mechanical compatibility required)
• Approval Agency: CE, CSA, UL (all three certifications required)

The KLPC650.X from Littelfuse Inc. qualifies as a substitute part because it meets all mandatory electrical and mechanical parameters. Variations in response time classification (fast blow vs. slow blow) and additional DC voltage ratings do not disqualify substitution when AC ratings and mechanical form factors are identical.

Parameter Comparison

Engineering Selection Recommendations

Both the KTU-650 and KLPC650.X maintain active product status with full regulatory compliance (CE, CSA, UL certifications). Selection between these parts should be based on application-specific requirements:

The KTU-650 is specified for fast-blow response characteristics. The KLPC650.X provides slow-blow response with additional 480 VDC capability. In AC-only applications at 600 VAC with 650A requirements, both parts are electrically and mechanically compatible. The dimensional variance of 0.002" in length (3.750" vs. 3.752") is within standard manufacturing tolerance and does not affect bolt-mount installation compatibility.

Both parts carry equivalent RoHS compliance status (RoHS Compliant vs. ROHS3 Compliant) and maintain identical breaking capacity at rated AC voltage (200kA). Inventory availability differs: KTU-650 has 1078 units in stock; KLPC650.X has 809 units in stock.

Frequently Asked Questions (FAQ)

Q: Can KLPC650.X replace KTU-650 in all applications?

A: KLPC650.X is electrically and mechanically compatible with KTU-650 for 600 VAC, 650A applications. The primary difference is response time classification (slow blow vs. fast blow). Verify that your circuit design accommodates slow-blow characteristics before substitution.

Q: What is the significance of the 0.002" dimensional difference?

A: The length variance (3.750" vs. 3.752") is within standard manufacturing tolerance for cylindrical fuse cartridges and does not affect bolt-mount installation or electrical performance.

Q: Does KLPC650.X's 480 VDC rating affect AC-only applications?

A: No. The additional DC voltage rating is a capability enhancement and does not impact AC performance at 600 VAC. Both parts are rated identically for AC applications.

Q: Are both parts RoHS compliant?

A: Yes. KTU-650 is RoHS Compliant; KLPC650.X is ROHS3 Compliant. Both meet current RoHS requirements.

Q: What is the difference between fast-blow and slow-blow response?

A: Fast-blow fuses (KTU-650) interrupt circuits rapidly upon overcurrent. Slow-blow fuses (KLPC650.X) tolerate temporary current surges before interruption. Application requirements determine which response type is appropriate.

Q: Are all required certifications present on both parts?

A: Yes. Both KTU-650 and KLPC650.X carry CE, CSA, and UL approvals, meeting industrial and electrical application standards.