Littelfuse 0NLS020.T Fuse Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0NLS020.T is a 20A fast-blow cartridge fuse rated for 600 VAC and 500 VDC operation. This component is part of the POWR-GARD® NLS series and is designed for electrical and industrial applications requiring reliable overcurrent protection. The part maintains active product status with 735 units in current inventory. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and safety certifications align with the original specification, enabling direct replacement in compatible holder assemblies.

Substiute Parts

0NLS020.T

Littelfuse Inc.In Stock: 8150NLS020.T Datasheet

Current PartRFQ

NOS-20

Eaton - Bussmann Electrical DivisionIn Stock: 1039NOS-20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0NLS020.T are identified based on the following critical parameters that determine functional equivalence:

• Current Rating: 20A
• Voltage Rating: 600 VAC / 500 VDC minimum
• Response Time: Fast Blow
• Fuse Type: Cartridge
• Physical Dimensions: 0.811" Dia x 5.000" L
• Safety Certifications: CE, CSA, UL compliance
• RoHS Compliance: ROHS3 or equivalent

The substitute part NOS-20 from Eaton - Bussmann Electrical Division meets these core electrical and mechanical requirements, enabling direct replacement within compatible fuse holder assemblies.

Parameter Comparison

Engineering Selection Recommendations

Both the 0NLS020.T and NOS-20 maintain active product status with current manufacturing support. The 0NLS020.T carries explicit CE, CSA, and UL certifications with ROHS3 compliance. The NOS-20 is RoHS compliant and listed as a manufacturer-recommended substitute. Selection between these parts should be based on:

• Holder assembly compatibility with cartridge dimensions (0.811" Dia x 5.000" L)
• Certification requirements specific to the end application
• Supply chain and inventory availability
• Manufacturer support and technical documentation access

Frequently Asked Questions (FAQ)

Q: Can the NOS-20 directly replace the 0NLS020.T in all applications?

A: Direct replacement is possible only in fuse holder assemblies designed for 0.811" diameter x 5.000" length cartridge fuses. Electrical ratings must match the circuit requirements. Verify holder compatibility before substitution.

Q: What does "Fast Blow" response time mean?

A: Fast Blow fuses interrupt circuit current rapidly upon overcurrent detection, typically within milliseconds. This characteristic is critical for protecting sensitive electronic circuits and equipment from damage.

Q: Are both parts RoHS compliant?

A: Yes. The 0NLS020.T is ROHS3 compliant, and the NOS-20 is RoHS compliant. Both meet environmental regulatory requirements for hazardous substance restrictions.

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

A: Class K5 fuses are general-purpose cartridge fuses with a breaking capacity of 50kA at rated voltage. This classification indicates the maximum fault current the fuse can safely interrupt without rupturing.

Q: How do voltage ratings affect substitution?

A: The 0NLS020.T is rated for 600 VAC and 500 VDC operation. Substitute parts must meet or exceed these voltage ratings for the same application. Using a fuse with lower voltage ratings in a higher-voltage circuit creates a safety hazard.