Littelfuse 0LD55873Z Power Distribution Block - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0LD55873Z is a 3-pole power distribution block rated for 665 A at 600 V, designed for industrial power distribution applications. This component features screw connections on both line and load sides, with 1 line-side connection per pole and 4 load-side connections per pole. The part is classified as obsolete, making identification of suitable substitute components essential for system maintenance and new installations where equivalent functionality is required.

Substiute Parts

0LD55873Z

Littelfuse Inc.In Stock: 8470LD55873Z Datasheet

Current PartRFQ

LFD55863Z

Littelfuse Inc.In Stock: 773LFD55863Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0LD55873Z is determined by the following critical parameters that must remain consistent or be enhanced:

• Voltage Rating: Must be 600 V or higher
• Number of Poles: Must be 3
• Connection Type: Must be screw connections on both line and load sides
• Wire/Stud Size Compatibility: Must accommodate the same or broader range (Line: 500MCM–#4; Load: 2/0–#14 CU/AL)
• Current Capacity: Must meet or exceed 665 A
• Mechanical Compatibility: Physical dimensions and mounting must be compatible with existing installations

The Littelfuse LFD55863Z meets these substitution criteria while offering enhanced specifications, including increased current capacity (760 A) and expanded connection points (2 line-side and 8 load-side connections per pole), providing greater flexibility for power distribution configurations.

Parameter Comparison

Engineering Selection Recommendations

The LFD55863Z is the manufacturer-recommended substitute for the obsolete 0LD55873Z. Both components maintain identical voltage and pole configurations with compatible wire/stud size ranges. The substitute provides enhanced current capacity (760 A versus 665 A) and increased connection points per pole, delivering superior performance margins without compromising electrical or mechanical compatibility.

The LFD55863Z carries active product status and maintains ROHS3 compliance, ensuring long-term availability and regulatory alignment. The increased connection density (2 line-side and 8 load-side connections per pole versus 1 and 4 respectively) provides additional flexibility for complex power distribution architectures while maintaining backward compatibility with existing screw-terminal installations.

Frequently Asked Questions (FAQ)

Q: Can the LFD55863Z directly replace the 0LD55873Z in existing installations?

A: Yes. Both components share identical voltage ratings (600 V), pole count (3), connection types (screw), and wire/stud size ranges. The substitute's enhanced current capacity and connection points provide equivalent or superior functionality without requiring system redesign.

Q: What is the significance of the increased current rating in the LFD55863Z?

A: The LFD55863Z is rated for 760 A compared to the 0LD55873Z's 665 A. This 95 A increase provides additional capacity margin, allowing the substitute to handle higher load conditions while maintaining the same physical form factor and connection specifications.

Q: Are there packaging differences between these components?

A: The 0LD55873Z is supplied without specified packaging, while the LFD55863Z is packaged in boxes. Both are available in stock quantities suitable for production and replacement applications.

Q: Do both parts meet the same regulatory compliance standards?

A: Yes. Both the 0LD55873Z and LFD55863Z are ROHS3 compliant. The LFD55863Z additionally carries REACH Unaffected status, confirming compliance with current environmental regulations.

Q: What is the practical advantage of the LFD55863Z's additional connection points?

A: The LFD55863Z provides 2 line-side and 8 load-side connections per pole, compared to 1 and 4 in the 0LD55873Z. This expanded connectivity enables more complex power distribution configurations, parallel conductor arrangements, and multi-load distribution without requiring additional terminal blocks.