JJN-45 Equivalent & Substitute Parts

Part Overview

The JJN-45 is a fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division, rated for 45A at 300 VAC / 160 VDC. This component is part of the Limitron™ JJN series and is actively produced. The fuse is designed for electrical and industrial applications requiring Class T protection with a breaking capacity of 200kA AC and 20kA DC. Substitute parts are identified to provide equivalent electrical and mechanical performance for applications where the original part is unavailable or where alternative sourcing is required.

Substiute Parts

JJN-45

Eaton - Bussmann Electrical DivisionIn Stock: 931JJN-45 Datasheet

Current PartRFQ

JLLN045.T

Littelfuse Inc.In Stock: 749JLLN045.T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the JJN-45 is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 45A
• Voltage Rating: 300 VAC / 160 VDC
• Fuse Class: T
• Response Time: Fast Blow
• Breaking Capacity: 200kA AC / 20kA DC
• Cartridge form factor with non-standard dimensions
• Holder-based mounting requirement

The JLLN045.T from Littelfuse Inc. meets all these criteria and is classified as a direct substitute. Both parts operate within identical electrical specifications and are approved for the same industrial and electrical applications.

Parameter Comparison

Engineering Selection Recommendations

Both the JJN-45 and JLLN045.T are active products with current manufacturing status. The JJN-45 carries UL approval, while the JLLN045.T carries UR approval; both include CE and CSA certifications. The JLLN045.T meets ROHS3 compliance, while the JJN-45 meets RoHS compliance. Dimensional tolerances between the two parts are minimal (diameter variance of 0.003" and length variance of 0.006"), and both are designed for identical holder-based mounting systems. Selection between these parts should be based on availability, certification requirements specific to the application, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can the JLLN045.T be used as a direct replacement for the JJN-45?

A: Yes. Both parts are rated for 45A at 300 VAC / 160 VDC, share identical Class T fast-blow characteristics, and have equivalent breaking capacities of 200kA AC and 20kA DC. Dimensional differences are within acceptable tolerances for cartridge fuse holders.

Q: Are there any compliance differences between these parts?

A: The JJN-45 carries UL approval while the JLLN045.T carries UR approval. Both include CE and CSA certifications. The JLLN045.T meets ROHS3 compliance versus RoHS compliance for the JJN-45. Application-specific certification requirements should be verified before selection.

Q: What is the significance of the dimensional difference?

A: The JJN-45 measures 0.560" diameter x 0.880" length, while the JLLN045.T measures 0.563" diameter x 0.874" length. These variations are within standard manufacturing tolerances for non-standard cartridge fuses and do not affect compatibility with standard fuse holders designed for this form factor.

Q: Do both parts require the same holder type?

A: Yes. Both the JJN-45 and JLLN045.T are cartridge fuses that require a compatible fuse holder for installation. They are not designed for direct panel mounting.

Q: What applications are these fuses suitable for?

A: Both parts are rated for electrical and industrial applications. The 45A rating at 300 VAC / 160 VDC with 200kA AC breaking capacity makes them suitable for general-purpose circuit protection in industrial control systems and electrical distribution equipment.