KLDR04.5T Equivalent & Substitute Parts

Part Overview

The KLDR04.5T is a 4.5A cartridge fuse manufactured by Littelfuse Inc., rated for 600 VAC and 300 VDC operation. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The POWR-GARD® KLDR series provides slow-blow protection suitable for transformer applications. Identifying compatible alternatives ensures continuity of supply while maintaining electrical and mechanical compatibility with existing installations.

Substiute Parts

KLDR04.5T

Littelfuse Inc.In Stock: 1117KLDR04.5T Datasheet

Current PartRFQ

KLDR04.5TXP

LittelfuseIn Stock: 1164KLDR04.5TXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KLDR04.5T is determined by strict equivalence across the following critical parameters:

• Current Rating: 4.5A (exact match required)
• Voltage Rating: 600 VAC / 300 VDC (exact match required)
• Response Time: Slow Blow (exact match required)
• Fuse Class: CC (exact match required)
• Package / Case: 5AG, 10mm x 38mm (exact match required)
• Physical Dimensions: 0.406" Dia x 1.500" L (exact match required)
• Approval Certifications: CE, CSA, UL (minimum requirement)

The KLDR04.5TXP meets all substitution criteria as a direct equivalent within the same POWR-GARD® KLDR series, maintaining identical electrical specifications and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The KLDR04.5TXP is the direct substitute for the obsolete KLDR04.5T. Both components maintain identical electrical and mechanical specifications, with the KLDR04.5TXP offering the advantage of active product status and current manufacturing availability. Both parts carry equivalent regulatory certifications (CE, CSA, UL) and comply with ROHS3 requirements. Selection between these parts is determined by availability and supply chain considerations rather than technical performance differences.

Frequently Asked Questions (FAQ)

Q: Can the KLDR04.5TXP be used as a direct replacement for the KLDR04.5T?

A: Yes. The KLDR04.5TXP is electrically and mechanically identical to the KLDR04.5T across all critical parameters: current rating, voltage ratings, response time, fuse class, physical dimensions, and regulatory certifications.

Q: What determines compatibility between these fuse cartridges?

A: Compatibility is determined by exact equivalence in current rating (4.5A), AC/DC voltage ratings (600 VAC / 300 VDC), response time (Slow Blow), fuse class (CC), and physical package dimensions (5AG, 10mm x 38mm). Any deviation in these parameters results in incompatibility.

Q: Are there packaging differences between KLDR04.5T and KLDR04.5TXP?

A: The KLDR04.5T is packaged with a dash designation, while the KLDR04.5TXP is packaged in a box. This represents a packaging format difference only and does not affect electrical or mechanical compatibility.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the KLDR04.5T and KLDR04.5TXP carry identical approval certifications: CE, CSA, and UL. Both are ROHS3 compliant.

Q: Why is the KLDR04.5T listed as obsolete?

A: The KLDR04.5T has been discontinued by the manufacturer. The KLDR04.5TXP represents the current active equivalent within the POWR-GARD® KLDR series and is the recommended selection for new designs and ongoing supply requirements.