ATM25 Equivalent & Substitute Parts Reference

Part Overview

The ATM25 is a 600V 25A midget fuse manufactured by Mersen USA Newburyport-MA L.L.C. This component is classified as an active product with ROHS3 compliance. The ATM25 serves as a protective device in electrical and industrial applications requiring fast-blow response characteristics. 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

ATM25

Mersen USA Newburyport-MA L.L.C.In Stock: 942ATM25 Datasheet

Current PartRFQ

0KLK025.T

Littelfuse Inc.In Stock: 10780KLK025.T Datasheet

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KLKR025.T

Littelfuse Inc.In Stock: 765KLKR025.T Datasheet

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KTK-25

Eaton - Bussmann Electrical DivisionIn Stock: 977KTK-25 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ATM25 are qualified based on the following critical parameters:

• Current Rating: 25A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Package / Case: 5AG, 10mm x 38mm (Midget) (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)
• RoHS Status: ROHS3 Compliant (compliance requirement)

Three substitute parts meet these criteria: 0KLK025.T (Littelfuse Inc.), KLKR025.T (Littelfuse Inc.), and KTK-25 (Eaton - Bussmann Electrical Division). Each substitute maintains identical electrical performance and mechanical compatibility with the ATM25 within their specified voltage and breaking capacity ranges.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (0KLK025.T, KLKR025.T, and KTK-25) are active products with ROHS3 compliance and maintain the same ECCN and HTSUS classifications as the ATM25. Selection among these substitutes depends on application-specific requirements:

The 0KLK025.T (Littelfuse POWR-GARD® KLK series) provides 500 VDC capability and carries QPL approval in addition to CE, CSA, and UL certifications, with 100kA AC and 50kA DC breaking capacity.

The KLKR025.T (Littelfuse POWR-GARD® KLKR series) is classified as Class CC with 300 VDC capability and 200kA AC and 20kA DC breaking capacity, certified by CE, CSA, and UL.

The KTK-25 (Eaton - Bussmann KTK series) provides 100kA breaking capacity with CSA and UL certifications.

All three maintain identical 25A, 600 VAC ratings, fast-blow response, and 5AG midget form factor with mechanical compatibility in standard fuse holders.

Frequently Asked Questions (FAQ)

Q: Can the 0KLK025.T, KLKR025.T, and KTK-25 be used interchangeably with the ATM25?

A: Yes, within the scope of 600 VAC, 25A applications. All three substitute parts match the ATM25 in current rating, AC voltage rating, fuse type, package dimensions, response time, and mounting requirements. DC voltage ratings and breaking capacities differ among substitutes and should be evaluated against specific circuit requirements.

Q: What is the difference between the 0KLK025.T and KLKR025.T?

A: Both are Littelfuse cartridge fuses rated 25A at 600 VAC. The primary differences are DC voltage rating (0KLK025.T: 500 VDC vs. KLKR025.T: 300 VDC), breaking capacity (0KLK025.T: 100kA AC/50kA DC vs. KLKR025.T: 200kA AC/20kA DC), and classification (KLKR025.T is Class CC). The 0KLK025.T includes QPL approval.

Q: Do all substitute parts require a fuse holder?

A: Yes. The ATM25 and all three substitute parts (0KLK025.T, KLKR025.T, KTK-25) are cartridge fuses that require a holder for installation. They are not direct-plug components.

Q: Are all parts RoHS compliant?

A: Yes. The ATM25 and all three substitute parts are ROHS3 compliant.

Q: What certifications should I consider when selecting a substitute?

A: The 0KLK025.T carries CE, CSA, QPL, and UL certifications. The KLKR025.T carries CE, CSA, and UL certifications. The KTK-25 carries CSA and UL certifications. Selection should align with your application's regulatory and approval requirements.