DCM-4 Equivalent & Substitute Parts Reference

Part Overview

The DCM-4 is a 4A 600VAC/VDC fast-blow cartridge fuse manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, though 969 pieces remain available in new original stock. The DCM-4 is designed for electrical and industrial applications requiring reliable overcurrent protection in circuits rated up to 600 volts AC or DC. Due to its obsolete status, identifying equivalent substitute parts ensures continuity of supply and design flexibility for new procurement cycles.

Substiute Parts

DCM-4

Eaton - Bussmann Electrical DivisionIn Stock: 984DCM-4 Datasheet

Current PartRFQ

KTK-4

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DCM-4 is determined by the following critical parameters:

• Current Rating: Must be 4A
• Voltage Rating: Must support minimum 600 VAC; DC rating of 600 VDC is specific to DCM-4
• Fuse Type: Must be cartridge format
• Response Time: Must be fast-blow
• Package / Case: Must be 5AG standard (10mm x 38mm midget)
• Physical Dimensions: Must match 0.406" Dia x 1.500" L
• Approval Certifications: Must carry CSA and UL approval

The KTK-4 meets all substitution criteria for AC applications. The DCM-4 specifies both 600 VAC and 600 VDC ratings, while the KTK-4 specifies 600 VAC only. This distinction is material for DC circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The KTK-4 is the direct substitute for the DCM-4 in AC applications. Both components share identical current ratings, AC voltage ratings, fuse type, response time, physical dimensions, and approval certifications from CSA and UL.

The KTK-4 holds active product status, ensuring ongoing availability and support, whereas the DCM-4 is obsolete. For new designs or procurement cycles, the KTK-4 is the appropriate selection.

For applications requiring DC circuit protection at 600 VDC, the DCM-4 specification includes explicit 600 VDC rating. The KTK-4 does not specify a DC voltage rating. Verify DC application requirements against the KTK-4 datasheet before substitution in DC circuits.

Frequently Asked Questions (FAQ)

Q: Can the KTK-4 directly replace the DCM-4 in all applications?

A: The KTK-4 is a direct substitute for AC applications up to 600 VAC. For DC applications at 600 VDC, the KTK-4 datasheet must be consulted, as its DC rating is not specified in the provided data.

Q: What is the significance of the 5AG package designation?

A: The 5AG designation identifies the fuse as a midget cartridge format with standardized dimensions of 10mm x 38mm. This ensures mechanical compatibility with standard 5AG fuse holders. Both the DCM-4 and KTK-4 conform to this standard.

Q: Why is the DCM-4 listed as obsolete?

A: Obsolete status indicates that the manufacturer has discontinued active production and support. The KTK-4, with active status, represents the current product line equivalent.

Q: Are there differences in breaking capacity between the DCM-4 and KTK-4?

A: The DCM-4 specifies 100kA AC and 50kA DC breaking capacity. The KTK-4 specifies 100kA breaking capacity without DC specification. Both meet the 100kA AC requirement.

Q: Do both fuses require a holder for installation?

A: Yes. Both the DCM-4 and KTK-4 are cartridge fuses that require a compatible 5AG fuse holder for installation. They are not designed for direct circuit connection.