Littelfuse 0LD55871Z Power Distribution Block - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0LD55871Z is a 1-pole power distribution block rated for 665 A at 600 V, designed for high-current power distribution applications. This component features single line-side and four load-side screw connections, accommodating wire sizes from 500 MCM (#4) on the line side to 2/0–#14 on the load side.

The 0LD55871Z is classified as obsolete. Locating an active equivalent is necessary to ensure long-term supply chain reliability, ongoing manufacturer support, and access to current production batches with full compliance documentation.

Substiute Parts

0LD55871Z

Littelfuse Inc.In Stock: 10150LD55871Z Datasheet

Current PartRFQ

0LD55861Z

Littelfuse Inc.In Stock: 9360LD55861Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 0LD55861Z qualifies as a manufacturer-recommended substitute for the 0LD55871Z based on the following substitution criteria:

Matching Parameters (Substitution Basis):

• Identical manufacturer: Littelfuse Inc.
• Identical series: POWR-BLOKS® LD
• Identical type: Power Distribution Block
• Identical number of poles: 1
• Identical voltage rating: 600 V
• Identical connection type: Screw connections on both line and load sides
• Identical wire/stud size ranges: Line side 500 MCM (#4)–350 MCM (#6) CU/AL; Load side 2/0–#14 CU/AL
• Identical RoHS compliance: ROHS3 Compliant
• Identical MSL rating: 1 (Unlimited)

Allowable Differences:

• Current rating: 760 A (substitute) vs. 665 A (original) — higher rating maintains backward compatibility
• Line side connections per pole: 2 (substitute) vs. 1 (original) — additional connection point increases distribution flexibility
• Load side connections per pole: 8 (substitute) vs. 4 (original) — additional connection points increase load distribution capacity
• Product status: Active (substitute) vs. Obsolete (original) — ensures ongoing availability and support

Parameter Comparison

Engineering Selection Recommendations

The 0LD55861Z is the manufacturer-recommended substitute for the obsolete 0LD55871Z. Both components maintain identical electrical and mechanical specifications for voltage, current capacity envelope, wire gauge compatibility, and connection methodology. The substitute offers enhanced distribution capacity through increased connection points (2 line-side, 8 load-side versus 1 line-side, 4 load-side) and a higher current rating (760 A versus 665 A), providing operational margin within the same form factor and mounting footprint.

The 0LD55861Z carries active product status with full ROHS3 compliance and MSL 1 rating, ensuring current manufacturing support and compliance documentation availability. Selection of the 0LD55861Z eliminates supply chain risk associated with obsolete inventory and provides access to current production batches.

Frequently Asked Questions (FAQ)

Q: Can the 0LD55861Z directly replace the 0LD55871Z in existing installations?

A: Yes. Both components share identical voltage rating (600 V), wire gauge compatibility (line side 500 MCM–350 MCM; load side 2/0–#14), connection type (screw), and mechanical form factor. The substitute's higher current rating (760 A) and additional connection points do not create incompatibility; they provide operational margin.

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

A: The 0LD55861Z is rated for 760 A compared to the original 665 A. This higher rating maintains full backward compatibility while providing additional capacity headroom. Applications operating at or below 665 A encounter no thermal or electrical stress concerns.

Q: Why does the substitute have more connection points?

A: The 0LD55861Z provides 2 line-side connections and 8 load-side connections versus 1 and 4 respectively on the original. This increased connectivity allows greater distribution flexibility without changing the electrical or mechanical interface. Unused connection points do not affect performance in applications requiring fewer connections.

Q: Are there packaging differences between these parts?

A: The original 0LD55871Z was supplied in unspecified packaging; the substitute 0LD55861Z is supplied in bulk packaging. Both maintain identical component specifications and compliance ratings.

Q: Does the substitute maintain the same compliance certifications?

A: Yes. Both components are ROHS3 compliant with MSL 1 (Unlimited) rating. The substitute carries active product status, ensuring ongoing compliance documentation and manufacturing support.

Q: What is the supply status difference?

A: The 0LD55871Z is classified as obsolete with limited remaining inventory (956 pieces). The 0LD55861Z is active production with current inventory (880 pieces) and ongoing manufacturer support, eliminating long-term supply chain risk.