ATQR2-1/4 Equivalent & Substitute Parts

Part Overview

The ATQR2-1/4 is a time-delay Class CC fuse manufactured by Mersen USA Newburyport-MA L.L.C. with a 200kA breaking capacity. This component is classified as active and remains in production. Equivalent substitute parts may be required due to supply chain considerations, inventory availability, or specific application requirements where alternative manufacturers' products meet identical electrical and mechanical specifications.

Substiute Parts

ATQR2-1/4

Mersen USA Newburyport-MA L.L.C.In Stock: 1044ATQR2-1/4 Datasheet

Current PartRFQ

KLDR2.25HXP

Littelfuse Inc.In Stock: 831KLDR2.25HXP Datasheet

SimilarRFQ

KLDR2.25TXP

Littelfuse Inc.In Stock: 768KLDR2.25TXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts KLDR2.25TXP and KLDR2.25HXP from Littelfuse Inc. are qualified equivalents based on the following matching parameters:

• Fuse Class: CC
• Response Time: Slow Blow (time-delay characteristic)
• Breaking Capacity: 200kA AC, 20kA DC
• Fuse Type: Cartridge
• Current Rating: 2.25A
• Voltage Rating: 600 VAC / 300 VDC
• Mounting: Requires Holder
• Package / Case: 5AG, 10mm x 38mm (Midget)
• Physical Dimensions: 0.406" Dia x 1.500" L (10.30mm x 38.10mm)

Both substitute parts maintain identical electrical performance and mechanical compatibility with the original ATQR2-1/4 specification.

Parameter Comparison

Engineering Selection Recommendations

Both KLDR2.25TXP and KLDR2.25HXP are active, production-status components from Littelfuse Inc. that meet the electrical and mechanical requirements of the ATQR2-1/4. The primary distinction between the two substitutes is packaging: KLDR2.25TXP is supplied in box packaging, while KLDR2.25HXP is supplied in bulk packaging.

KLDR2.25TXP is recommended for applications requiring box packaging consistency with the original ATQR2-1/4 specification. KLDR2.25HXP is suitable for high-volume applications where bulk packaging is acceptable.

Both substitute parts carry CE, CSA, and UL approvals and are ROHS3 compliant, providing enhanced regulatory compliance compared to the non-compliant status of the original part.

Frequently Asked Questions (FAQ)

Q: Can KLDR2.25TXP and KLDR2.25HXP be used interchangeably with ATQR2-1/4?

A: Yes. Both Littelfuse parts are electrically and mechanically equivalent. They share identical Class CC rating, 2.25A current rating, 600 VAC / 300 VDC voltage ratings, slow-blow response time, 200kA breaking capacity, and 5AG midget cartridge form factor. The only difference is packaging format.

Q: What is the significance of the packaging difference between KLDR2.25TXP and KLDR2.25HXP?

A: KLDR2.25TXP is packaged in boxes, suitable for applications requiring individual unit handling and traceability. KLDR2.25HXP is packaged in bulk, optimized for high-volume procurement and assembly operations. Electrical and mechanical performance are identical.

Q: Are the substitute parts compliant with current regulatory standards?

A: Both KLDR2.25TXP and KLDR2.25HXP are ROHS3 compliant and carry CE, CSA, and UL approvals. The original ATQR2-1/4 is RoHS non-compliant. Substitution with either Littelfuse part upgrades regulatory compliance status.

Q: What mounting requirements apply to these fuses?

A: All three parts—ATQR2-1/4, KLDR2.25TXP, and KLDR2.25HXP—require a fuse holder for installation. They are not panel-mount or direct-solder components.

Q: Are there any dimensional compatibility concerns?

A: No. All three parts use the 5AG midget cartridge form factor with identical dimensions: 0.406" diameter × 1.500" length (10.30mm × 38.10mm). They are mechanically interchangeable in standard 5AG fuse holders.