KLU-650 Equivalent & Substitute Parts Reference

Part Overview

The KLU-650 is a 650A 600 VAC fuse cartridge manufactured by Eaton - Bussmann Electrical Division, part of the Limitron™ KLU series. This slow-blow cylindrical cartridge fuse is designed for bolt mount applications in electrical and industrial systems. The part is currently active in production with 736 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and application-specific voltage requirements where DC ratings are necessary.

Substiute Parts

KLU-650

Eaton - Bussmann Electrical DivisionIn Stock: 771KLU-650 Datasheet

Current PartRFQ

KLLU650.X

Littelfuse Inc.In Stock: 865KLLU650.X Datasheet

SimilarRFQ

KLPC650.X

Littelfuse Inc.In Stock: 882KLPC650.X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the KLU-650 are qualified based on the following critical parameters:

• Current Rating: 650A (exact match required)
• AC Voltage Rating: 600 VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Class: L (exact match required)
• Mounting Type: Bolt Mount (exact match required)
• Package / Case: Cylindrical, Blade Terminal (Bolt) (exact match required)
• Physical Dimensions: 2.500" Dia x 3.750" L nominal (within tolerance)
• Approval Agencies: CE, CSA, UL (minimum requirement)

The identified substitutes maintain all critical electrical and mechanical parameters. Variations in DC voltage ratings and breaking capacity at DC do not affect AC-only applications. Physical dimension tolerances (±0.002" L) are within acceptable manufacturing standards for bolt-mount cartridge fuses.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and hold identical AC electrical ratings (650A, 600 VAC, Class L, Slow Blow). All are approved by CE, CSA, and UL agencies, meeting the same regulatory compliance framework.

KLU-650 (Eaton - Bussmann): Primary specification. AC-only rated. Suitable for applications requiring no DC voltage capability.

KLLU650.X (Littelfuse POWR-GARD® KLLU): Direct substitute for AC applications. Adds 300 VDC rating capability. Physical dimensions within tolerance (3.752" L vs. 3.750" L). ROHS3 compliant. Recommended where mixed AC/DC system compatibility is required or where Littelfuse supply chain is preferred.

KLPC650.X (Littelfuse POWR-GARD® / POWR-PRO® KLPC): Direct substitute for AC applications. Adds 480 VDC rating capability with enhanced DC breaking capacity (300kA DC). Physical dimensions within tolerance (3.752" L vs. 3.750" L). ROHS3 compliant. Recommended where higher DC voltage or DC breaking capacity is required.

Frequently Asked Questions (FAQ)

Q: Can KLLU650.X or KLPC650.X be used as direct replacements for KLU-650 in AC-only circuits?

A: Yes. Both substitute parts maintain identical AC electrical specifications (650A, 600 VAC, Class L, Slow Blow response). Physical dimensions are within manufacturing tolerance. All three parts hold identical regulatory approvals (CE, CSA, UL).

Q: What is the difference between KLLU650.X and KLPC650.X?

A: Both are Littelfuse 650A 600 VAC Class L slow-blow cartridge fuses with bolt-mount configuration. KLLU650.X is rated 300 VDC with 20kA DC breaking capacity. KLPC650.X is rated 480 VDC with 300kA DC breaking capacity. For AC-only applications, both are electrically equivalent to KLU-650.

Q: Are there physical compatibility concerns when substituting these parts?

A: No. All three parts use identical mounting type (Bolt Mount), package style (Cylindrical, Blade Terminal), and diameter (2.500"). Length variation is 0.002" (3.750" vs. 3.752"), which is within standard manufacturing tolerance for cartridge fuse assemblies and does not affect bolt-mount installation.

Q: Do the substitute parts meet the same regulatory standards?

A: Yes. KLLU650.X and KLPC650.X hold identical approval agencies (CE, CSA, UL) as KLU-650. Both are ROHS3 compliant, exceeding the RoHS compliance of the original part.

Q: When should I select KLPC650.X over KLLU650.X?

A: Select KLPC650.X when the application requires DC voltage protection above 300V or when higher DC breaking capacity (300kA vs. 20kA) is specified. For AC-only applications or mixed AC/DC systems operating at 300 VDC or below, KLLU650.X is sufficient.