KLDR.500T Equivalent & Substitute Parts

Part Overview

The KLDR.500T is a 500mA cartridge fuse rated for 600 VAC and 300 VDC operation, designed for transformer protection applications. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system maintenance and component procurement. The POWR-GARD® KLDR series provides slow-blow response characteristics with CC-class ratings and international approvals (CE, CSA, UL).

Substiute Parts

KLDR.500T

Littelfuse Inc.In Stock: 1198KLDR.500T Datasheet

Current PartRFQ

KLDR.500TXP

Littelfuse Inc.In Stock: 1218KLDR.500TXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KLDR.500T is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 500mA (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 Midget (exact match required)
• Physical Dimensions: 0.406" Dia x 1.500" L (exact match required)
• Approval Certifications: CE, CSA, UL (minimum requirement)

The KLDR.500TXP meets all substitution criteria as a direct equivalent within the POWR-GARD® KLDR series.

Parameter Comparison

Engineering Selection Recommendations

The KLDR.500TXP is the direct substitute for the obsolete KLDR.500T. Both components maintain identical electrical specifications, mechanical dimensions, and regulatory certifications. The KLDR.500TXP carries active product status with current manufacturing support from Littelfuse Inc., ensuring long-term availability and supply chain continuity. Both components satisfy CE, CSA, and UL approval requirements and maintain ROHS3 compliance. Selection of the KLDR.500TXP eliminates obsolescence risk while preserving full functional and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the KLDR.500TXP be used as a direct replacement for the KLDR.500T?

A: Yes. The KLDR.500TXP is electrically and mechanically identical to the KLDR.500T across all critical parameters: 500mA current rating, 600 VAC / 300 VDC voltage ratings, slow-blow response, CC-class rating, 5AG package format, and physical dimensions. Both components hold identical regulatory certifications.

Q: What is the primary advantage of switching to the KLDR.500TXP?

A: The KLDR.500TXP maintains active product status, ensuring ongoing manufacturing support and supply availability. The KLDR.500T is obsolete and subject to supply discontinuation.

Q: Are there any packaging differences between these components?

A: The KLDR.500T is supplied in standard packaging, while the KLDR.500TXP is supplied in bulk packaging. Both components are functionally identical and mount identically in 5AG cartridge fuse holders.

Q: Do both components meet the same regulatory standards?

A: Yes. Both the KLDR.500T and KLDR.500TXP carry CE, CSA, and UL approvals and maintain ROHS3 compliance.

Q: What is the breaking capacity of these fuses?

A: Both components provide 200kA breaking capacity at rated AC voltage and 20kA breaking capacity at rated DC voltage.