KLPC4000X Equivalent & Substitute Parts

Part Overview

The KLPC4000X is a 4kA cartridge fuse manufactured by Littelfuse Inc., rated for 600 VAC and 480 VDC operation. This slow-blow fuse is designed for bolt-mount applications in electrical and industrial systems. The product is currently active and available in stock. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements where voltage or breaking capacity parameters differ from the original specification.

Substiute Parts

KLPC4000X

Littelfuse Inc.In Stock: 881KLPC4000X Datasheet

Current PartRFQ

KRP-C-4000SP

Eaton - Bussmann Electrical DivisionIn Stock: 908KRP-C-4000SP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KLPC4000X is determined by the following critical parameters:

• Current Rating: Must be 4kA
• Voltage Rating - AC: Must be 600 VAC
• Fuse Type: Must be Cartridge
• Response Time: Must be Slow Blow
• Mounting Type: Must be Bolt Mount
• Class: Must be L
• Package / Case: Must be Cylindrical, Blade Terminal (Bolt)

The KRP-C-4000SP qualifies as a substitute part because it matches all critical parameters. However, the DC voltage rating differs (300 VDC vs. 480 VDC), and the breaking capacity specifications vary. These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the KLPC4000X and KRP-C-4000SP are active products with identical regulatory certifications (CE, CSA, UL) and compliance status. Selection between these parts must be based on application voltage requirements:

• Use KLPC4000X for applications requiring 480 VDC operation
• Use KRP-C-4000SP for applications limited to 300 VDC operation

Breaking capacity differences must be evaluated against system fault current levels. The KLPC4000X provides 300kA DC breaking capacity, while the KRP-C-4000SP provides 100kA DC breaking capacity. Physical dimensions differ slightly; verify mounting clearance in the target application.

Frequently Asked Questions (FAQ)

Q: Can KRP-C-4000SP replace KLPC4000X in all applications?

A: No. The KRP-C-4000SP has a lower DC voltage rating (300 VDC vs. 480 VDC). Use it only in applications where the system DC voltage does not exceed 300 VDC.

Q: What is the significance of the breaking capacity difference?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The KLPC4000X breaks 300kA DC; the KRP-C-4000SP breaks 100kA DC. Select based on your system's maximum available fault current.

Q: Are the physical dimensions compatible?

A: The parts are similar but not identical. KLPC4000X is 5.752" Dia x 4.000" L; KRP-C-4000SP is 5.750" Dia x 3.750" L. Verify mounting clearance in your specific application.

Q: Do both parts have the same certifications?

A: Yes. Both are certified by CE, CSA, and UL, and both are Class L cartridge fuses with slow-blow response characteristics.

Q: What is the difference in RoHS compliance?

A: KLPC4000X is ROHS3 Compliant; KRP-C-4000SP is RoHS Compliant. Both meet applicable environmental standards for their respective product lines.