Littelfuse 0NLS125.X Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0NLS125.X is a 125A fast-blow fuse cartridge rated for 600 VAC/VDC operation, designed for electrical and industrial applications. This component is classified as Class K5 and requires a compatible fuse holder for installation. The part is currently active in production with 1129 units in stock. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and approval certifications align with the original specification.

Substiute Parts

0NLS125.X

Littelfuse Inc.In Stock: 11710NLS125.X Datasheet

Current PartRFQ

NOS-125

Eaton - Bussmann Electrical DivisionIn Stock: 969NOS-125 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0NLS125.X are identified based on the following critical parameters that determine functional equivalence:

• Current Rating: 125A
• Voltage Rating: 600 VAC / 600 VDC
• Response Time: Fast Blow
• Fuse Class: K5
• Breaking Capacity: 50kA
• Physical Dimensions: Cylindrical form factor with blade terminals
• Approval Certifications: CE, CSA, UL compliance

The Eaton - Bussmann Electrical Division NOS-125 meets these electrical and mechanical requirements, establishing it as a qualified substitute within the same application category.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0NLS125.X and Eaton NOS-125 are active production components with equivalent electrical specifications and regulatory compliance. Selection between these parts should be based on:

• Availability and lead time requirements
• Inventory status (Littelfuse: 1129 units; Eaton: 893 units in stock)
• Existing supply chain relationships
• RoHS compliance requirements (both meet applicable standards)
• Regulatory certifications required for the application (both carry CE, CSA, UL approvals)

Frequently Asked Questions (FAQ)

Q: Can the Eaton NOS-125 be used as a direct replacement for the Littelfuse 0NLS125.X?

A: Yes. Both parts share identical electrical ratings (125A, 600 VAC/VDC), response characteristics (fast blow), fuse class (K5), and physical form factor (cylindrical with blade terminals). Both carry equivalent regulatory approvals.

Q: Are there any dimensional differences between these fuses?

A: The provided specifications confirm both parts use cylindrical form factor with blade terminals. Verify physical dimensions with the manufacturer datasheet before installation to ensure compatibility with the fuse holder assembly.

Q: What is the significance of the K5 fuse class?

A: Class K5 designates the fuse's performance characteristics, including breaking capacity and response time. Both substitute parts maintain this classification, ensuring equivalent protection performance in the circuit.

Q: Do both parts meet RoHS requirements?

A: Yes. The Littelfuse 0NLS125.X is ROHS3 Compliant, and the Eaton NOS-125 is RoHS Compliant. Both meet current environmental compliance standards.

Q: What is the breaking capacity, and why does it matter?

A: Both parts have a 50kA breaking capacity at rated voltage. This specification defines the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard.