Littelfuse 0RLS500.X Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0RLS500.X is a 500A, 600 VAC cylindrical fuse cartridge from the POWR-GARD® RLS series, designed for electrical and industrial applications requiring fast-blow protection. This part is classified as obsolete, necessitating identification of active equivalent components that maintain functional compatibility while meeting current availability and compliance requirements.

Substiute Parts

0RLS500.X

Littelfuse Inc.In Stock: 11590RLS500.X Datasheet

Current PartRFQ

KLSR500.X

Littelfuse Inc.In Stock: 1062KLSR500.X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse KLSR500.X qualifies as a direct substitute for the 0RLS500.X based on the following critical parameters:

• Current Rating: Both parts are rated at 500A, ensuring identical load protection characteristics
• AC Voltage Rating: Both maintain 600 VAC rating, compatible with the same electrical systems
• Fuse Type & Package: Both are cylindrical cartridge fuses with blade terminals, mechanically compatible with standard holders
• Response Time: Both employ fast-blow characteristics for equivalent protection response
• Mounting Configuration: Both require a holder, maintaining installation compatibility
• Approval Certifications: Both carry CE, CSA, and UL approvals, meeting the same regulatory standards

The KLSR500.X represents an active product with enhanced specifications, including additional 300 VDC capability and higher breaking capacity ratings, while maintaining full backward compatibility with the 0RLS500.X application envelope.

Parameter Comparison

Engineering Selection Recommendations

The KLSR500.X is the designated substitute for the obsolete 0RLS500.X. Selection is based on:

• Product Status: The 0RLS500.X is obsolete; the KLSR500.X is active and maintains current manufacturing support
• Regulatory Compliance: Both parts carry identical CE, CSA, and UL certifications. The KLSR500.X additionally meets ROHS3 compliance requirements, aligning with current environmental standards
• Functional Equivalence: Matching current rating (500A), AC voltage rating (600 VAC), fuse type (cartridge), response time (fast-blow), and mechanical package ensure direct application compatibility
• Enhanced Capability: The KLSR500.X provides superior breaking capacity (200kA AC versus 10kA) and DC voltage capability (300 VDC), offering improved performance margins without compromising the original application requirements

Frequently Asked Questions (FAQ)

Q: Can the KLSR500.X directly replace the 0RLS500.X in existing installations?

A: Yes. Both parts share identical current rating (500A), AC voltage rating (600 VAC), cartridge fuse type, fast-blow response, cylindrical package with blade terminals, and holder mounting requirements. Mechanical and electrical compatibility is maintained.

Q: What is the significance of the different fuse classes (H versus RK1)?

A: Fuse class designation reflects the breaking capacity and application envelope. The KLSR500.X RK1 class provides higher breaking capacity (200kA AC) compared to the 0RLS500.X H class (10kA), offering enhanced protection capability while remaining suitable for the same electrical systems.

Q: Why is the KLSR500.X physically longer than the 0RLS500.X?

A: The KLSR500.X measures 13.374" L versus 8.870" L for the 0RLS500.X. Both are cylindrical cartridges with blade terminals designed for standard holders. Physical length difference does not affect holder compatibility, as both employ the same blade terminal interface and diameter (3.094").

Q: Does the KLSR500.X's additional 300 VDC rating affect AC-only applications?

A: No. The 300 VDC rating is an additional capability that does not impact AC performance. The KLSR500.X maintains full 600 VAC compatibility and fast-blow response characteristics identical to the 0RLS500.X.

Q: What is the inventory status for these parts?

A: The 0RLS500.X (obsolete) has 1145 pcs in stock. The KLSR500.X (active) has 966 pcs in stock, ensuring availability for new applications and replacements.