ATM4 600V 4A Midget Fuse Equivalent & Substitute Parts

Part Overview

The ATM4 is a 600V 4A 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 specifications to ensure direct interchangeability in applications where the original part may be unavailable or require alternative sourcing.

Substiute Parts

ATM4

Mersen USA Newburyport-MA L.L.C.In Stock: 737ATM4 Datasheet

Current PartRFQ

0KLK004.T

Littelfuse Inc.In Stock: 8220KLK004.T Datasheet

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KLKR004.T

Littelfuse Inc.In Stock: 1294KLKR004.T Datasheet

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KTK-4

Eaton - Bussmann Electrical DivisionIn Stock: 834KTK-4 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ATM4 is determined by the following critical parameters:

• Current Rating: Must be 4A
• Voltage Rating - AC: Must be 600 VAC minimum
• Package / Case: Must be 5AG, 10mm x 38mm (Midget) form factor
• Fuse Type: Must be Cartridge type requiring holder mounting
• Response Time: Must be Fast Blow
• Product Status: Must be Active
• RoHS Compliance: Must be ROHS3 Compliant

All identified substitute parts meet these core electrical and mechanical requirements, ensuring functional equivalence and direct replacement capability in existing fuse holder assemblies.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts—0KLK004.T, KLKR004.T, and KTK-4—are qualified equivalents for the ATM4 based on matching electrical ratings, mechanical form factor, and compliance certifications.

0KLK004.T (Littelfuse POWR-GARD® KLK): Carries UL, CSA, and CE certifications with 100kA AC breaking capacity at rated voltage. Provides 500 VDC rating for applications requiring DC voltage capability.

KLKR004.T (Littelfuse POWR-GARD® KLKR): Carries UL, CSA, and CE certifications with 200kA AC breaking capacity at rated voltage. Classified as CC-class fuse with 300 VDC rating. Highest breaking capacity among substitute options.

KTK-4 (Eaton - Bussmann KTK Series): Carries UL and CSA certifications with 100kA breaking capacity at rated voltage. Provides AC-only rating specification.

Selection among these substitutes should be based on application-specific requirements for DC voltage rating, breaking capacity, and required certifications within the target system.

Frequently Asked Questions (FAQ)

Q: Can 0KLK004.T, KLKR004.T, and KTK-4 be used interchangeably with ATM4?

A: Yes. All three parts share identical current rating (4A), AC voltage rating (600 VAC), fuse type (Cartridge), package form factor (5AG, 10mm x 38mm Midget), response time (Fast Blow), and mounting requirement (Requires Holder). They are direct functional equivalents.

Q: What is the difference between the substitute parts?

A: The primary differences are DC voltage ratings and breaking capacity. 0KLK004.T provides 500 VDC with 100kA breaking capacity. KLKR004.T provides 300 VDC with 200kA breaking capacity and CC-class designation. KTK-4 is AC-rated only with 100kA breaking capacity. Select based on application voltage requirements and system breaking capacity specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts—0KLK004.T, KLKR004.T, and KTK-4—are ROHS3 compliant, matching the compliance status of the ATM4.

Q: Do these fuses require a specific holder type?

A: All parts require a fuse holder designed for 5AG, 10mm x 38mm (Midget) cartridge fuses. Existing ATM4 holders are compatible with all substitute parts.

Q: Which certifications apply to each substitute?

A: 0KLK004.T carries UL, CSA, CE, and QPL certifications. KLKR004.T carries UL, CSA, and CE certifications. KTK-4 carries UL and CSA certifications. Verify certification requirements for your specific application before selection.