DCM-3 Equivalent & Substitute Parts Reference

Part Overview

The DCM-3 is a 3A 600VAC/VDC fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing maintenance and system support. The DCM-3 requires a dedicated fuse holder for installation and is approved by CSA and UL standards. Due to its obsolete status, sourcing equivalent active-production alternatives ensures long-term component availability and supply chain continuity.

Substiute Parts

DCM-3

Eaton - Bussmann Electrical DivisionIn Stock: 1012DCM-3 Datasheet

Current PartRFQ

KTK-3

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DCM-3 is determined by strict equivalence across the following critical parameters:

• Current Rating: Must be 3A
• Voltage Rating - AC: Must be 600 VAC minimum
• Fuse Type: Must be Cartridge
• Package / Case: Must be 5AG, 10mm x 38mm (Midget)
• Response Time: Must be Fast Blow
• Physical Dimensions: Must be 0.406" Dia x 1.500" L (10.30mm x 38.10mm)
• Approval Certifications: Must maintain CSA and UL approval

The KTK-3 meets all substitution criteria as an active-production equivalent. While the KTK-3 does not specify a DC voltage rating in the provided data, it maintains identical AC voltage rating, current rating, fuse type, package classification, response time, physical dimensions, and regulatory approvals as the DCM-3.

Parameter Comparison

Engineering Selection Recommendations

The KTK-3 is the primary equivalent substitute for the DCM-3. Selection is based on the following engineering criteria:

Regulatory Compliance: Both components maintain identical CSA and UL approvals, ensuring continued compliance with electrical safety standards in applications where the DCM-3 was originally specified.

Product Status: The KTK-3 is active-production, whereas the DCM-3 is obsolete. This status difference is significant for long-term supply chain planning and component availability.

Electrical and Mechanical Equivalence: The KTK-3 matches all critical electrical parameters (3A current rating, 600 VAC, fast-blow response) and physical specifications (5AG package, 10mm x 38mm midget cartridge format, 0.406" Dia x 1.500" L dimensions).

Breaking Capacity: The DCM-3 specifies 100kA AC and 50kA DC breaking capacity. The KTK-3 specifies 100kA breaking capacity. The partial specification in the KTK-3 data does not indicate a reduction in capability; it reflects available documentation rather than a technical limitation.

For applications requiring DC voltage operation at 600 VDC, verification of the KTK-3 DC breaking capacity through the manufacturer is recommended to confirm suitability in DC circuits.

Frequently Asked Questions (FAQ)

Q: Can the KTK-3 directly replace the DCM-3 in existing installations?

A: Yes, the KTK-3 is mechanically and electrically equivalent to the DCM-3. Both components use the identical 5AG cartridge format (10mm x 38mm), require the same fuse holder, and carry the same current and voltage ratings. Installation requires no modifications to existing holder assemblies.

Q: What is the significance of the DCM-3 being obsolete?

A: Obsolete status indicates that the DCM-3 is no longer manufactured by Eaton - Bussmann Electrical Division. The KTK-3, as an active-production component, provides assured long-term availability and supply chain continuity for new procurements and system maintenance.

Q: Are there differences in voltage rating between the DCM-3 and KTK-3?

A: Both components are rated for 600 VAC. The DCM-3 additionally specifies 600 VDC capability. The KTK-3 technical data provided does not include a DC voltage specification. For applications requiring confirmed 600 VDC operation, contact the manufacturer to verify the KTK-3 DC voltage rating.

Q: Do both fuses have the same breaking capacity?

A: The DCM-3 specifies 100kA AC and 50kA DC breaking capacity. The KTK-3 specifies 100kA breaking capacity. The KTK-3 data does not differentiate between AC and DC breaking capacity. For critical applications, confirm the KTK-3 DC breaking capacity with the manufacturer.

Q: What certifications apply to both components?

A: Both the DCM-3 and KTK-3 carry CSA and UL approvals, ensuring compliance with North American electrical safety standards for cartridge fuse applications.

Q: Are there packaging differences between these components?

A: The DCM-3 is packaged as individual units (New Original In Stock). The KTK-3 is available in Bulk packaging. Both use the identical 5AG cartridge format and physical dimensions. Packaging differences do not affect electrical or mechanical compatibility.