0LKS500.Z Equivalent & Substitute Parts

Part Overview

The 0LKS500.Z is a 500A 600VAC cylindrical fuse link manufactured by Littelfuse Inc. as part of the POWR-GARD® LKS series. This component is classified as obsolete, requiring identification of active equivalent parts for continued system support and procurement. The fuse link design necessitates a separate holder for installation and operates with fast-blow response characteristics suitable for electrical and industrial applications.

Substiute Parts

0LKS500.Z

Littelfuse Inc.In Stock: 7950LKS500.Z Datasheet

Current PartRFQ

KLSR500.X

Littelfuse Inc.In Stock: 1062KLSR500.X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The KLSR500.X is identified as the manufacturer-recommended substitute for the 0LKS500.Z. Substitution eligibility is determined by the following parameters:

• Current Rating Match: Both parts rated at 500A
• AC Voltage Rating Match: Both rated at 600 VAC
• Fuse Type Compatibility: Both require separate holder mounting with cylindrical blade terminal configuration
• Response Characteristic: Both feature fast-blow response
• Manufacturer Continuity: Both manufactured by Littelfuse Inc.
• Approval Agencies: Both carry CE, CSA, and UL certifications

The KLSR500.X represents an active product with enhanced specifications, including DC voltage capability (300 VDC) and superior breaking capacity (200kA AC vs. 10kA AC), while maintaining full compatibility with the core electrical parameters of the 0LKS500.Z.

Parameter Comparison

Engineering Selection Recommendations

The KLSR500.X is the active equivalent for the obsolete 0LKS500.Z based on manufacturer designation and electrical parameter alignment. Selection of the KLSR500.X provides:

• Product Continuity: Active product status ensures ongoing availability and support from Littelfuse Inc.
• Regulatory Compliance: ROHS3 compliance of the KLSR500.X addresses modern environmental standards, whereas the 0LKS500.Z is non-compliant.
• Certification Maintenance: Both parts maintain identical approval agency certifications (CE, CSA, UL), ensuring regulatory equivalence in electrical and industrial applications.
• Enhanced Performance: The KLSR500.X offers increased breaking capacity and DC voltage capability without compromising AC performance at the specified 600 VAC, 500A rating.

Physical dimension differences (length: 8.870" vs. 13.374") must be verified against holder specifications and installation space constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can the KLSR500.X directly replace the 0LKS500.Z in existing installations?

A: The KLSR500.X matches the critical electrical parameters (500A, 600 VAC, fast-blow response) and maintains identical approval certifications. Physical length difference (13.374" vs. 8.870") requires verification that the existing holder accommodates the longer cartridge. Both parts require the same holder mounting type with blade terminals.

Q: What is the difference between Class H and Class RK1 fuses?

A: Class designation reflects fuse construction and breaking capacity standards. The 0LKS500.Z (Class H) has a breaking capacity of 10kA, while the KLSR500.X (Class RK1) has 200kA AC breaking capacity. Both classes are suitable for industrial and electrical applications; the RK1 classification provides enhanced fault protection capability.

Q: Does the KLSR500.X DC voltage rating affect AC-only applications?

A: No. The KLSR500.X maintains full 600 VAC rating identical to the 0LKS500.Z. The additional 300 VDC capability is supplementary and does not impact AC circuit performance.

Q: Why is RoHS compliance important for this substitution?

A: The KLSR500.X is ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The obsolete 0LKS500.Z is non-compliant. For new procurements and systems subject to RoHS regulations, the KLSR500.X is the required choice.

Q: Are there inventory considerations between these parts?

A: The 0LKS500.Z has 761 pieces in stock (obsolete status), while the KLSR500.X has 966 pieces available (active product). For long-term system support, the active KLSR500.X ensures continued availability.