0LKS450.Z Equivalent & Substitute Parts

Part Overview

The 0LKS450.Z is a 450A 600VAC cylindrical fuse link from Littelfuse Inc.'s POWR-GARD® LKS series, designed for electrical and industrial applications requiring fast-blow response characteristics. This part is classified as obsolete, making identification of suitable substitutes necessary for ongoing system maintenance and component procurement. The fuse link requires a dedicated holder for installation and operates within a breaking capacity of 10kA at rated voltage.

Substiute Parts

0LKS450.Z

Littelfuse Inc.In Stock: 8720LKS450.Z Datasheet

Current PartRFQ

KLSR450.X

Littelfuse Inc.In Stock: 1113KLSR450.X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0LKS450.Z is determined by the following critical parameters:

• Current Rating: 450A (must match exactly)
• Voltage Rating (AC): 600 VAC (must match or exceed)
• Fuse Type: Cylindrical configuration with blade terminals
• Response Time: Fast Blow characteristic
• Mounting: Requires holder compatibility
• Approval Certifications: CE, CSA, UL compliance

The KLSR450.X cartridge fuse qualifies as a substitute based on matching current rating (450A), AC voltage rating (600 VAC), fast-blow response, cylindrical blade terminal configuration, and identical approval certifications. The KLSR450.X operates as an active product within the POWR-GARD® family, providing enhanced breaking capacity (200kA AC) and extended DC voltage capability (300 VDC), while maintaining mechanical and electrical compatibility with systems designed for the 0LKS450.Z.

Parameter Comparison

Engineering Selection Recommendations

The KLSR450.X is the designated substitute for the obsolete 0LKS450.Z based on the following engineering criteria:

• Both parts maintain identical current and AC voltage ratings (450A, 600 VAC), ensuring electrical compatibility in existing circuit designs
• Both parts carry CE, CSA, and UL certifications, meeting the same regulatory and safety standards
• The KLSR450.X is an active product with current manufacturing support and availability, eliminating supply chain risk associated with the obsolete 0LKS450.Z
• The KLSR450.X provides enhanced breaking capacity (200kA AC versus 10kA) and additional DC voltage capability (300 VDC), offering improved performance margins in industrial and electrical applications
• The KLSR450.X achieves ROHS3 compliance, whereas the 0LKS450.Z is non-compliant, supporting modern environmental and regulatory requirements
• Physical dimensions differ in length (13.374" versus 8.870"), requiring verification of holder and mounting space compatibility in the target application

Frequently Asked Questions (FAQ)

Q: Can the KLSR450.X directly replace the 0LKS450.Z in all applications?

A: The KLSR450.X matches the critical electrical parameters (450A, 600 VAC, fast-blow response) and certifications of the 0LKS450.Z. However, the increased length (13.374" versus 8.870") requires confirmation that the fuse holder and mounting space accommodate the substitute part. Mechanical fit must be verified before installation.

Q: What is the difference between the H and RK1 fuse classes?

A: Class H and Class RK1 are distinct fuse classifications with different breaking capacities and application profiles. The 0LKS450.Z operates as Class H with 10kA breaking capacity, while the KLSR450.X operates as Class RK1 with 200kA AC breaking capacity. Both classes are approved for 600 VAC industrial and electrical applications. Selection between classes depends on the specific circuit protection requirements and fault current levels in the target system.

Q: Does the KLSR450.X's additional 300 VDC rating affect AC-only applications?

A: No. The KLSR450.X's 300 VDC rating is an additional capability that does not impact performance in 600 VAC AC applications. The part operates identically to the 0LKS450.Z in AC circuits and provides extended functionality for systems requiring DC voltage protection.

Q: Are there inventory or lead time considerations?

A: The 0LKS450.Z is obsolete with limited remaining stock (765 Pcs). The KLSR450.X is an active product with established supply channels and current inventory (1072 Pcs), ensuring reliable procurement and shorter lead times for new installations and replacements.

Q: What is the significance of ROHS3 compliance on the KLSR450.X?

A: ROHS3 compliance indicates the KLSR450.X meets current European Union Restriction of Hazardous Substances regulations, restricting the use of specific hazardous materials in electrical and electronic equipment. The 0LKS450.Z is non-compliant with these standards. For applications subject to ROHS3 requirements or future regulatory transitions, the KLSR450.X is the appropriate selection.