ATM3 600V 3A Midget Fuse - Equivalent & Substitute Parts

Part Overview

The ATM3 is a 600V 3A midget fuse manufactured by Mersen USA Newburyport-MA L.L.C. This cartridge fuse is designed for electrical and industrial applications requiring fast-blow response characteristics. The part maintains active product status and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Substiute Parts

ATM3

Mersen USA Newburyport-MA L.L.C.In Stock: 956ATM3 Datasheet

Current PartRFQ

0KLK003.T

Littelfuse Inc.In Stock: 11260KLK003.T Datasheet

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KLKR003.T

Littelfuse Inc.In Stock: 801KLKR003.T Datasheet

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KTK-3

Eaton - Bussmann Electrical DivisionIn Stock: 916KTK-3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATM3 are qualified based on the following critical parameters:

• Current Rating: 3A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Package / Case: 5AG, 10mm x 38mm Midget (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (functional equivalence)

The three identified substitute parts meet all primary electrical and mechanical criteria. Variations in DC voltage ratings and breaking capacity do not affect AC circuit protection performance at the specified 600 VAC, 3A rating.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are qualified for direct replacement of the ATM3 based on electrical and mechanical equivalence. Selection among substitutes should be based on:

• Approval Agency certifications: 0KLK003.T and KLKR003.T carry CE, CSA, and UL approvals; KTK-3 carries CSA and UL approvals
• Inventory availability and packaging preference (Box vs. Bulk)
• DC voltage rating requirements: 0KLK003.T supports 500 VDC; KLKR003.T supports 300 VDC; KTK-3 does not specify DC rating
• Breaking capacity specifications: KLKR003.T provides 200kA AC breaking capacity; 0KLK003.T and KTK-3 provide 100kA AC breaking capacity

All parts maintain ROHS3 compliance and active product status, ensuring long-term availability and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: Can 0KLK003.T, KLKR003.T, and KTK-3 be used interchangeably with ATM3?

A: Yes. All three parts meet the critical electrical parameters (3A, 600 VAC, Fast Blow) and mechanical specifications (5AG, 10mm x 38mm Midget cartridge). They are direct functional equivalents for AC circuit protection applications at the specified rating.

Q: What is the difference between the substitute parts?

A: The primary differences are manufacturer, DC voltage rating capability, breaking capacity, and approval agency certifications. For AC-only applications at 600 VAC, 3A, these differences do not affect performance. DC voltage ratings apply only if the fuse will be exposed to DC circuits.

Q: Does packaging type (Box vs. Bulk) affect compatibility?

A: No. Packaging type affects only procurement and handling. The fuse cartridge itself is identical regardless of packaging. ATM3 is supplied in Box packaging; 0KLK003.T and KTK-3 are supplied in Bulk; KLKR003.T is supplied in Box.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts and the main part ATM3 are ROHS3 compliant, meeting environmental and regulatory requirements.

Q: What does "Requires Holder" mean?

A: The fuse cartridge must be installed in a compatible fuse holder. The 5AG, 10mm x 38mm Midget form factor is standard across all parts, ensuring holder compatibility.