Littelfuse 46379-6 Fuse Block: Equivalent & Substitute Parts

Part Overview

The Littelfuse 46379-6 is a 6-circuit blade fuse block rated for 150 A at 32V, designed for panel mount applications with quick connect 0.250" (6.3mm) termination. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and new design implementations. Substitute parts must maintain compatibility with ATC and ATO blade fuse types while meeting the electrical and mechanical specifications required for the application.

Substiute Parts

46379-6

LittelfuseIn Stock: 122846379-6 Datasheet

Current PartRFQ

880027

Littelfuse Inc.In Stock: 815880027 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 46379-6 is determined by the following critical parameters:

• Voltage Rating: Must equal or exceed 32V
• Number of Circuits: Must equal 6 circuits
• Fuse Type Compatibility: Must accept ATC or ATO blade fuses
• Current Handling: Substitute must support the application's current requirements
• Termination Interface: Must be compatible with the system's connection method
• Compliance Status: Must maintain ROHS3 and REACH compliance

The Littelfuse 880027 qualifies as a substitute based on matching voltage (32V), circuit count (6), fuse type (ATO blade), and compliance certifications. However, differences in mounting type, current rating, and termination style must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 880027 is an active product suitable for applications where the 46379-6 is no longer available. Selection of this substitute requires verification that:

• The application's current requirement does not exceed 100 A (the 880027 is rated 50 A lower than the original part)
• Chassis mount orientation is compatible with the system design (the 46379-6 is panel mount)
• Screw terminal connections can replace quick connect termination in the existing wiring harness
• ATO blade fuse compatibility is sufficient (the 880027 does not support ATC fuses, unlike the original)

The 880027 maintains the same voltage rating (32V), circuit count (6), and blade fuse type as the 46379-6, ensuring core electrical compatibility. Both parts are manufactured by Littelfuse, supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 880027 directly replace the 46379-6 in all applications?

A: No. While both parts share the same voltage rating, circuit count, and fuse type, they differ in mounting method (panel vs. chassis), termination style (quick connect vs. screw), and current rating (150 A vs. 100 A). Substitution is valid only when the application's current requirement does not exceed 100 A and the mounting and termination changes are compatible with the system design.

Q: What is the significance of the current rating difference between these parts?

A: The 46379-6 is rated for 150 A total current, while the 880027 is rated for 100 A. If the application requires current handling above 100 A, the 880027 cannot be used. Verify the actual current draw of the protected circuits before substitution.

Q: Are both parts RoHS compliant?

A: The 46379-6 is confirmed ROHS3 compliant. RoHS compliance status for the 880027 is not specified in the provided data and should be verified with the manufacturer if regulatory compliance is required.

Q: What is the difference between ATC and ATO blade fuses?

A: Both are blade fuse types with different physical dimensions and current ratings. The 46379-6 accepts both ATC and ATO fuses, while the 880027 accepts only ATO fuses. Verify that your fuse inventory uses ATO fuses before substituting.

Q: Can I adapt the quick connect termination of the 46379-6 to the screw terminal of the 880027?

A: Termination adaptation is possible but requires mechanical and electrical verification. The 0.250" (6.3mm) quick connect interface of the 46379-6 differs from the screw terminal interface of the 880027. Any adaptation must maintain proper contact pressure and electrical continuity.