KLDR01.4T Equivalent & Substitute Parts

Part Overview

The KLDR01.4T is a 1.4A cartridge fuse manufactured by Littelfuse Inc. as part of the POWR-GARD® KLDR series. This component is rated for 600 VAC / 300 VDC operation with slow-blow response characteristics, designed for transformer protection applications. The part is classified as obsolete, making identification of active equivalent models essential for procurement and system continuity.

Substiute Parts

KLDR01.4T

Littelfuse Inc.In Stock: 813KLDR01.4T Datasheet

Current PartRFQ

KLDR01.4TXP

Littelfuse Inc.In Stock: 877KLDR01.4TXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KLDR01.4T is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish direct substitutability:

• Current Rating: 1.4A (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)
• Physical Dimensions: 10mm x 38mm Midget cartridge (exact match required)
• Breaking Capacity: 200kA AC / 20kA DC (exact match required)
• Regulatory Compliance: CE, CSA, UL certifications (exact match required)

The KLDR01.4TXP meets all substitution criteria as an active product variant within the same POWR-GARD® KLDR series, maintaining identical electrical performance and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The KLDR01.4TXP is the direct active equivalent for the obsolete KLDR01.4T. Selection of the KLDR01.4TXP is supported by:

• Identical electrical specifications across all rated parameters
• Matching mechanical form factor and mounting requirements
• Equivalent regulatory certifications (CE, CSA, UL)
• Active product status ensuring ongoing availability and supply chain continuity
• ROHS3 compliance maintained across both variants

The transition from KLDR01.4T to KLDR01.4TXP requires no circuit modifications, holder changes, or application re-qualification.

Frequently Asked Questions (FAQ)

Q: Can KLDR01.4TXP be used as a direct replacement for KLDR01.4T?

A: Yes. The KLDR01.4TXP is electrically and mechanically identical to the KLDR01.4T across all specified parameters, including current rating, voltage ratings, response time, breaking capacity, and physical dimensions. No circuit or holder modifications are required.

Q: What is the difference between KLDR01.4T and KLDR01.4TXP?

A: The primary difference is product status. KLDR01.4T is obsolete, while KLDR01.4TXP is active. Both parts are functionally equivalent and share identical electrical and mechanical specifications.

Q: Are there any packaging differences between these parts?

A: KLDR01.4T is supplied with standard packaging, while KLDR01.4TXP is supplied in box packaging. Both maintain the same 5AG, 10mm x 38mm (Midget) cartridge form factor and are compatible with the same fuse holders.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both KLDR01.4T and KLDR01.4TXP carry CE, CSA, and UL certifications and are ROHS3 compliant.

Q: What applications are these fuses suitable for?

A: Both parts are designed for transformer protection applications, operating at 600 VAC / 300 VDC with slow-blow response characteristics.