ATQR25 Equivalent & Substitute Parts Reference

Part Overview

The ATQR25 is a CC class cartridge fuse rated for 25A at 600V, manufactured by Mersen USA Newburyport-MA L.L.C. This fuse is designed for transformer protection applications and is ROHS3 compliant with active product status. Substitute parts become necessary when the original ATQR25 is unavailable, when bulk packaging is preferred over box packaging, or when alternative supplier inventory levels better support procurement timelines.

Substiute Parts

ATQR25

Mersen USA Newburyport-MA L.L.C.In Stock: 954ATQR25 Datasheet

Current PartRFQ

KLDR025.HXP

Littelfuse Inc.In Stock: 1550KLDR025.HXP Datasheet

SimilarRFQ

KLDR025.TXP

Littelfuse Inc.In Stock: 1573KLDR025.TXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The ATQR25 has two qualified substitutes: KLDR025.HXP and KLDR025.TXP, both manufactured by Littelfuse Inc. under the POWR-GARD® KLDR series. Substitution eligibility is determined by the following critical parameters:

• Current Rating: 25A (exact match required)
• Voltage Rating - AC: 600VAC (exact match required)
• Fuse Class: CC (exact match required)
• Response Time: Slow Blow (exact match required)
• Product Status: Active (both substitutes are active)
• RoHS Compliance: ROHS3 Compliant (both substitutes comply)

Both substitute parts meet all electrical and mechanical requirements for direct substitution. The primary difference between the two substitutes is packaging: KLDR025.HXP is supplied in bulk packaging, while KLDR025.TXP is supplied in box packaging.

Parameter Comparison

Engineering Selection Recommendations

Both KLDR025.HXP and KLDR025.TXP are valid substitutes for the ATQR25 based on electrical and mechanical parameter equivalence. Selection between them should be based on packaging requirements:

• Select KLDR025.TXP when box packaging is required to match the original ATQR25 packaging specification.
• Select KLDR025.HXP when bulk packaging is acceptable and higher inventory availability is advantageous.

Both substitutes carry CE, CSA, and UL approvals and maintain ROHS3 compliance, ensuring regulatory and standards alignment with the original part. Both are active products with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can KLDR025.HXP and KLDR025.TXP be used interchangeably with ATQR25?

A: Yes, both parts are electrically and mechanically equivalent. They share identical current ratings (25A), voltage ratings (600VAC), fuse class (CC), and response time (Slow Blow). The primary difference is packaging format: KLDR025.TXP matches the box packaging of ATQR25, while KLDR025.HXP is supplied in bulk.

Q: What is the significance of the 5AG package classification?

A: The 5AG designation indicates a midget cartridge fuse format with dimensions of 10mm x 38mm. This standardized package ensures mechanical compatibility with fuse holders designed for this form factor.

Q: Are there voltage rating differences between the substitutes?

A: The KLDR025 substitutes specify both AC and DC voltage ratings (600VAC / 300VDC), while the ATQR25 specification provided lists only the AC rating. The 600VAC rating is the critical parameter for substitution eligibility.

Q: Do all three parts require a fuse holder?

A: Yes, all three parts are cartridge fuses that require a compatible holder for installation. The 5AG midget format requires a holder designed for this package type.

Q: What is the difference between KLDR025.HXP and KLDR025.TXP?

A: Both parts are electrically identical. KLDR025.TXP is packaged in boxes, while KLDR025.HXP is supplied in bulk packaging. Choose based on your procurement and inventory management requirements.

Q: Are the substitute parts RoHS compliant?

A: Yes, both KLDR025.HXP and KLDR025.TXP are ROHS3 compliant, matching the compliance status of the ATQR25.