ATQR2 Equivalent & Substitute Parts Reference

Part Overview

The ATQR2 is a CC class cartridge fuse rated for 600V at 2A, manufactured by Mersen USA Newburyport-MA L.L.C. This fuse is designed for electrical and industrial applications requiring slow-blow response characteristics. The part is currently active in production with 783 units in stock. Finding equivalent substitute parts is necessary to ensure supply chain continuity, optimize procurement options, and maintain system compatibility across different sourcing channels.

Substiute Parts

ATQR2

Mersen USA Newburyport-MA L.L.C.In Stock: 892ATQR2 Datasheet

Current PartRFQ

FNQ-R-2

Eaton - Bussmann Electrical DivisionIn Stock: 861FNQ-R-2 Datasheet

SimilarRFQ

KLDR002.TXP

Littelfuse Inc.In Stock: 1297KLDR002.TXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATQR2 are qualified based on the following critical parameters that must match or exceed the original specification:

• Current Rating: 2A (exact match required)
• Voltage Rating - AC: 600 VAC (minimum requirement)
• Fuse Type: Cartridge (form factor requirement)
• Class: CC (protection class requirement)
• Response Time: Slow Blow (operational characteristic)
• Mounting Type: Requires Holder (mechanical compatibility)
• Package/Case: 5AG, 10mm x 38mm Midget (physical interchangeability)

The two identified substitutes meet all mandatory electrical and mechanical parameters. Both are cartridge fuses with identical current and voltage ratings, class designation, and physical dimensions, ensuring direct functional equivalence and mechanical interchangeability.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and are available in production quantities. The ATQR2 (Mersen) is RoHS non-compliant, while both substitute options—FNQ-R-2 (Eaton Limitron™ FNQ-R series) and KLDR002.TXP (Littelfuse POWR-GARD® KLDR series)—are ROHS3 compliant. Both substitutes carry identical approval certifications (CE, CSA, UL) and meet the same breaking capacity specification of 200kA at rated AC voltage.

The KLDR002.TXP offers extended voltage capability with 300 VDC rating in addition to the 600 VAC specification, providing broader application flexibility for systems requiring dual-voltage protection. The FNQ-R-2 maintains strict AC-only operation at 600 VAC, matching the original ATQR2 specification profile.

Selection between substitutes should be based on regulatory compliance requirements (RoHS status), application voltage domain (AC-only versus AC/DC), and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can FNQ-R-2 and KLDR002.TXP be used interchangeably with ATQR2?

A: Yes. Both substitutes are mechanically and electrically equivalent for AC applications at 600V, 2A. They share identical cartridge form factor (5AG, 10mm x 38mm), class designation (CC), and response characteristics (Slow Blow). All three require a fuse holder for installation.

Q: What is the difference between FNQ-R-2 and KLDR002.TXP?

A: The primary difference is voltage capability. FNQ-R-2 is rated for 600 VAC only, while KLDR002.TXP supports both 600 VAC and 300 VDC. Both maintain identical 2A current rating, CC class, and 200kA breaking capacity at rated voltage. KLDR002.TXP provides broader application coverage for mixed-voltage systems.

Q: Are there RoHS compliance differences?

A: Yes. ATQR2 is RoHS non-compliant. Both FNQ-R-2 and KLDR002.TXP are ROHS3 compliant. For applications requiring RoHS compliance, either substitute is acceptable.

Q: Do all three fuses require the same holder?

A: All three are 5AG cartridge fuses with identical 10mm x 38mm dimensions. They require a compatible 5AG fuse holder. Mechanical interchangeability is confirmed across all three parts.

Q: What certifications apply to these fuses?

A: FNQ-R-2 and KLDR002.TXP both carry CE, CSA, and UL approvals. ATQR2 certification details are not specified in the provided data.