ATQR20 Equivalent & Substitute Parts

Part Overview

The ATQR20 is a CC TD fuse rated for 600V at 20A, manufactured by Mersen USA Newburyport-MA L.L.C. This component is classified as an uncategorized fuse and maintains Active product status with ROHS3 compliance. Finding equivalent substitute parts is necessary to ensure supply chain flexibility, optimize procurement timelines, and maintain design compatibility across manufacturing batches and inventory sources.

Substiute Parts

ATQR20

Mersen USA Newburyport-MA L.L.C.In Stock: 708ATQR20 Datasheet

Current PartRFQ

KLDR020.TXP

Littelfuse Inc.In Stock: 886KLDR020.TXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATQR20 is determined by strict alignment of electrical and mechanical parameters. The primary criteria for equivalency are:

• Current Rating: 20A (exact match required)
• Voltage Rating: 600V AC minimum (exact match required)
• Fuse Class: CC (Cartridge Fuse, Class CC)
• Response Characteristic: Time Delay (TD) or Slow Blow equivalent
• Product Status: Active
• Regulatory Compliance: ROHS3 Compliant, EAR99 classification

The KLDR020.TXP from Littelfuse Inc. qualifies as a direct substitute based on matching current rating (20A), voltage rating (600 VAC with 300 VDC capability), fuse class (CC), and response time (Slow Blow). Both components maintain Active product status and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Both the ATQR20 and KLDR020.TXP maintain Active product status and full ROHS3 compliance, making either component suitable for new designs and ongoing production. The KLDR020.TXP offers additional DC voltage rating capability (300 VDC) beyond the AC specification, providing broader application flexibility. Selection between these components should be based on packaging requirements (Box vs. Bulk), inventory availability, and specific application voltage profiles. Both components carry EAR99 export classification and are certified by CE, CSA, and UL standards (as applicable to the KLDR020.TXP).

Frequently Asked Questions (FAQ)

Q: What makes KLDR020.TXP a valid substitute for ATQR20? A: Both components share identical current rating (20A), voltage rating (600V AC), fuse class (CC), and response characteristic (Time Delay/Slow Blow). Both maintain Active status and ROHS3 compliance, meeting all electrical and regulatory requirements for direct substitution.

Q: Are there packaging differences between these parts? A: Yes. The ATQR20 is supplied in Box packaging, while the KLDR020.TXP is supplied in Bulk packaging. Procurement and handling procedures may differ accordingly.

Q: Does the KLDR020.TXP offer any additional capabilities? A: The KLDR020.TXP includes a 300 VDC voltage rating in addition to its 600 VAC rating, whereas the ATQR20 specification lists only 600V. This provides expanded application coverage for DC circuit protection scenarios.

Q: Are both components suitable for transformer protection applications? A: The KLDR020.TXP is explicitly rated for transformer protection applications. Both components meet the electrical requirements for this use case based on their CC class designation and 20A/600V ratings.

Q: What is the breaking capacity difference between these fuses? A: The KLDR020.TXP specifies breaking capacity of 200kA AC and 20kA DC. Breaking capacity specifications for the ATQR20 are not provided in the available data.