ATMR1/2 Equivalent & Substitute Parts Reference

Part Overview

The ATMR1/2 is a 600V 1/2A CC fuse manufactured by Mersen USA Newburyport-MA L.L.C., currently in active product status with ROHS3 compliance. This component is essential for electrical circuit protection in industrial and commercial applications. Substitute parts may be required due to inventory availability, supply chain considerations, or specific application requirements while maintaining equivalent electrical and mechanical performance.

Substiute Parts

ATMR1/2

Mersen USA Newburyport-MA L.L.C.In Stock: 1089ATMR1/2 Datasheet

Current PartRFQ

0KLK.500T

Littelfuse Inc.In Stock: 9010KLK.500T Datasheet

SimilarRFQ

KLKR.500T

Littelfuse Inc.In Stock: 994KLKR.500T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATMR1/2 are qualified based on the following electrical and mechanical parameters:

• Current Rating: 500mA (1/2A equivalent)
• Voltage Rating - AC: 600VAC minimum
• Fuse Class: CC classification
• Fuse Type: Cartridge format
• Package / Case: 5AG, 10mm x 38mm (Midget) form factor
• RoHS Compliance: ROHS3 Compliant
• Product Status: Active

The substitute parts listed below meet these core criteria, enabling direct functional replacement in applications requiring 600V 500mA CC-class fuse protection.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the original ATMR1/2.

KLKR.500T is classified as CC-class, matching the original part specification exactly. This part carries CE, CSA, and UL approvals with a breaking capacity of 200kA AC and 20kA DC at rated voltage.

0KLK.500T provides equivalent electrical performance at 500mA and 600VAC ratings. This part carries CE, CSA, QPL, and UL approvals with a breaking capacity of 100kA AC and 50kA DC at rated voltage. The absence of explicit CC-class designation requires application-specific verification where CC-class certification is a mandatory requirement.

Both parts are supplied in cartridge format requiring a holder and are available in active inventory.

Frequently Asked Questions (FAQ)

Q: Can KLKR.500T and 0KLK.500T be used interchangeably with ATMR1/2?

A: Both parts share the same current rating (500mA), AC voltage rating (600VAC), cartridge fuse type, and 5AG 10mm x 38mm form factor. KLKR.500T maintains explicit CC-class designation matching the original part. Selection depends on whether CC-class certification is required for your specific application.

Q: What is the significance of the CC fuse class?

A: CC-class fuses are designed for general-purpose circuit protection with specific breaking capacity and response characteristics. KLKR.500T explicitly carries CC-class designation. Verify application requirements before substituting with 0KLK.500T, which does not list CC-class in provided specifications.

Q: Are these parts physically compatible?

A: All three parts use the 5AG cartridge format with 10mm x 38mm (Midget) dimensions and require a compatible fuse holder. Physical installation is identical across all three parts.

Q: What certifications apply to these substitute parts?

A: KLKR.500T carries CE, CSA, and UL approvals. 0KLK.500T carries CE, CSA, QPL, and UL approvals. Both meet ROHS3 compliance requirements.

Q: Do these parts have different breaking capacities?

A: Yes. KLKR.500T provides 200kA AC and 20kA DC breaking capacity. 0KLK.500T provides 100kA AC and 50kA DC breaking capacity. Application voltage and fault current conditions determine which breaking capacity is appropriate.