Littelfuse 0LD55523Z Power Distribution Block - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0LD55523Z is a 3-pole power distribution block rated for 380 A at 600 V, designed for industrial power distribution applications. This component features screw connections on both line and load sides, with a single connection per pole on the line side and 12 connections per pole on the load side. The part is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and component procurement.

Substiute Parts

0LD55523Z

Littelfuse Inc.In Stock: 10390LD55523Z Datasheet

Current PartRFQ

LFD55523Z

Littelfuse Inc.In Stock: 1238LFD55523Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0LD55523Z is determined by strict equivalence across the following critical parameters:

• Electrical Specifications: Voltage rating (600 V), current rating (380 A), and pole configuration (3 poles)
• Connection Architecture: Line side connections per pole (1), load side connections per pole (12), and connection type (screw connections on both sides)
• Wire/Stud Compatibility: Line side wire/stud size (500MCM - #4CU/AL) and load side wire/stud size (2 - #14CU/AL)
• Compliance Requirements: RoHS3 compliance and moisture sensitivity level (MSL 1)

The substitute part LFD55523Z meets all these criteria while offering the advantage of active product status, ensuring continued availability and support.

Parameter Comparison

Engineering Selection Recommendations

The LFD55523Z is the manufacturer-recommended substitute for the obsolete 0LD55523Z. Both components maintain identical electrical and mechanical specifications across all critical parameters: 3-pole configuration, 380 A current rating, 600 V voltage rating, and screw connection architecture with matching wire/stud sizes.

The primary distinction is product status: the 0LD55523Z is obsolete, while the LFD55523Z is active. This transition from the POWR-BLOKS® LD series to the POWR-BLOKS® LF series represents a product line evolution by Littelfuse Inc. Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Selection of the LFD55523Z for new installations or replacements ensures access to current manufacturing support, documentation, and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the LFD55523Z directly replace the 0LD55523Z in existing installations?

A: Yes. The LFD55523Z is electrically and mechanically equivalent to the 0LD55523Z across all specified parameters, including voltage rating, current capacity, pole configuration, connection types, and wire/stud sizes. No circuit modifications are required.

Q: What is the difference between the POWR-BLOKS® LD and POWR-BLOKS® LF series?

A: Both series are manufactured by Littelfuse Inc. and share identical electrical and mechanical specifications for this 3-pole, 380 A, 600 V configuration. The LF series represents the current product line, while the LD series is obsolete.

Q: Are there packaging differences between these parts?

A: The 0LD55523Z is supplied without specified packaging, while the LFD55523Z is packaged in a box. This does not affect functional compatibility or electrical performance.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 0LD55523Z and LFD55523Z are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level. The LFD55523Z additionally carries REACH Unaffected status.

Q: What wire gauges are compatible with these terminal blocks?

A: Line side connections accept 500MCM (kcmil) or #4 copper/aluminum conductors. Load side connections accept wire sizes from 2 AWG to #14 AWG copper/aluminum conductors.