ATQR7-1/2 Equivalent & Substitute Parts

Part Overview

The ATQR7-1/2 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. Substitute parts may be required due to inventory availability, regional sourcing preferences, or specific packaging requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

ATQR7-1/2

Mersen USA Newburyport-MA L.L.C.In Stock: 1033ATQR7-1/2 Datasheet

Current PartRFQ

KLDR07.5HXP

Littelfuse Inc.In Stock: 1021KLDR07.5HXP Datasheet

SimilarRFQ

KLDR07.5TXP

Littelfuse Inc.In Stock: 789KLDR07.5TXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATQR7-1/2 are qualified based on the following electrical and mechanical parameters:

• Current Rating: 7.5A
• Voltage Rating: 600 VAC / 300 VDC
• Response Time: Slow Blow (time-delay)
• Fuse Class: CC
• Breaking Capacity: 200kA AC / 20kA DC
• Package / Case: 5AG, 10mm x 38mm (Midget)
• Physical Dimensions: 0.406" Dia x 1.500" L (10.30mm x 38.10mm)
• Mounting Type: Requires Holder
• Approval Agencies: CE, CSA, UL

Both substitute parts (KLDR07.5HXP and KLDR07.5TXP) from Littelfuse Inc. meet these core parameters and are classified as active products with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Both KLDR07.5HXP and KLDR07.5TXP from Littelfuse Inc. are electrically and mechanically equivalent to the ATQR7-1/2. Key considerations for selection:

• KLDR07.5TXP matches the original packaging format (Box), making it the preferred direct substitute for inventory replacement.
• KLDR07.5HXP is supplied in Bulk packaging and may be suitable for high-volume applications or when packaging format is not a constraint.
• Both substitute parts carry CE, CSA, and UL approvals, providing broader regulatory compliance than the original part specification.
• Both substitute parts are ROHS3 compliant, offering improved environmental compliance compared to the RoHS non-compliant ATQR7-1/2.
• All three parts are active products with confirmed inventory availability.

Frequently Asked Questions (FAQ)

Q: Can KLDR07.5HXP and KLDR07.5TXP be used interchangeably with ATQR7-1/2?

A: Yes. Both Littelfuse parts meet the electrical specifications (7.5A, 600 VAC / 300 VDC, Slow Blow, Class CC, 200kA breaking capacity) and mechanical requirements (5AG package, 10mm x 38mm dimensions, holder-mounted) of the ATQR7-1/2.

Q: What is the difference between KLDR07.5HXP and KLDR07.5TXP?

A: The primary difference is packaging. KLDR07.5TXP is supplied in Box packaging, matching the original ATQR7-1/2 format. KLDR07.5HXP is supplied in Bulk packaging. Electrical and mechanical specifications are identical.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The ATQR7-1/2 is RoHS non-compliant, while both KLDR07.5HXP and KLDR07.5TXP are ROHS3 compliant. Additionally, the Littelfuse substitutes carry CE, CSA, and UL certifications.

Q: Do these fuses require a specific holder?

A: Yes. All three parts (ATQR7-1/2, KLDR07.5HXP, and KLDR07.5TXP) require a holder for installation. They use the standard 5AG, 10mm x 38mm (Midget) package format.

Q: What applications are these fuses suitable for?

A: These Class CC time-delay fuses are specified for transformer protection applications where slow-blow response is required to accommodate inrush currents while providing circuit protection.