Littelfuse 0RLS150.X Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0RLS150.X is a 150A, 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, making identification of suitable substitute components essential for system maintenance and replacement scenarios. The 0RLS150.X requires a compatible fuse holder for installation and operates within Class H specifications with a breaking capacity of 10kA at rated voltage.

Substiute Parts

0RLS150.X

Littelfuse Inc.In Stock: 7960RLS150.X Datasheet

Current PartRFQ

KLSR150.X

Littelfuse Inc.In Stock: 1151KLSR150.X Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse KLSR150.X is identified as the manufacturer-recommended substitute for the obsolete 0RLS150.X. Substitution eligibility is determined by the following critical parameters:

Matching Parameters:

• Current Rating: 150A (identical)
• Voltage Rating - AC: 600 VAC (identical)
• Fuse Type: Cartridge (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Requires Holder (identical)
• Package / Case: Cylindrical, Blade Terminals (identical)
• Approval Agencies: CE, CSA, UL (identical)

Enhanced Parameters in Substitute:

• Voltage Rating - DC: 300 VDC (additional capability)
• Class: RK1 (upgraded from Class H)
• Breaking Capacity: 200kA AC, 20kA DC (upgraded from 10kA)
• Size / Dimension: 1.843" Dia x 9.626" L (46.80mm x 244.50mm) — increased length
• Product Status: Active (currently manufactured)
• RoHS Compliance: ROHS3 Compliant (upgraded from non-compliant)

Parameter Comparison

Engineering Selection Recommendations

The KLSR150.X is the appropriate substitute for the obsolete 0RLS150.X based on the following engineering criteria:

Product Status & Availability: The 0RLS150.X is obsolete and no longer manufactured. The KLSR150.X is an active product with current manufacturing support, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both parts maintain identical current ratings (150A) and AC voltage ratings (600 VAC), with identical fast-blow response characteristics and cartridge form factor. This ensures functional equivalence in AC-only applications.

Regulatory Compliance: Both parts carry identical approval certifications (CE, CSA, UL), maintaining compliance with applicable standards. The KLSR150.X additionally achieves ROHS3 compliance, meeting modern environmental and regulatory requirements.

Physical Compatibility: Both parts feature identical cylindrical form factors with blade terminals and identical diameter (1.843"). The KLSR150.X has an increased length (9.626" vs. 6.878"), which must be verified against available holder space before installation.

Enhanced Capabilities: The KLSR150.X provides upgraded breaking capacity (200kA AC vs. 10kA) and RK1 class rating, offering superior protection margins. DC voltage capability (300 VDC) is an additional feature not present in the original part.

Frequently Asked Questions (FAQ)

Q: Can the KLSR150.X be used as a direct replacement for the 0RLS150.X?

A: The KLSR150.X is electrically and functionally equivalent for AC applications at 150A, 600 VAC with fast-blow response. Physical compatibility must be confirmed, as the KLSR150.X is longer (9.626" vs. 6.878") and requires verification that the existing fuse holder accommodates this increased length.

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

A: Both are fuse classes defined by breaking capacity and application characteristics. The KLSR150.X (Class RK1) provides a breaking capacity of 200kA AC compared to the 0RLS150.X (Class H) at 10kA, offering enhanced protection in high-fault-current environments.

Q: Does the KLSR150.X work in DC applications?

A: The KLSR150.X is rated for 300 VDC, whereas the 0RLS150.X has no DC rating. If DC operation is required, the KLSR150.X provides this capability. For AC-only systems, DC rating is not a functional consideration.

Q: Are both parts UL, CSA, and CE certified?

A: Yes, both the 0RLS150.X and KLSR150.X carry identical certifications from UL, CSA, and CE. The KLSR150.X additionally meets ROHS3 compliance standards.

Q: What should I verify before installing the KLSR150.X?

A: Confirm that the fuse holder can accommodate the increased length of the KLSR150.X (9.626" vs. 6.878"). Verify that blade terminal compatibility matches the holder design. Confirm that the 150A current rating and 600 VAC voltage rating align with circuit requirements.