DCM-3/4 Equivalent & Substitute Parts Reference

Part Overview

The DCM-3/4 is a 750mA fast-blow fuse cartridge rated for 600 VAC/VDC operation, manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, though 808 pieces remain available in new original stock. The DCM-3/4 is designed for electrical and industrial applications requiring cartridge-style fuse protection in a 5AG, 10mm x 38mm (Midget) form factor. Due to its obsolete status, identifying equivalent substitute parts with matching electrical and mechanical specifications is essential for system continuity and procurement planning.

Substiute Parts

DCM-3/4

Eaton - Bussmann Electrical DivisionIn Stock: 913DCM-3/4 Datasheet

Current PartRFQ

KTK-R-3/4

Eaton - Bussmann Electrical DivisionIn Stock: 975KTK-R-3/4 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DCM-3/4 is determined by strict equivalence across the following critical parameters:

• Current Rating: 750mA (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 (exact match required)

The KTK-R-3/4 meets all mandatory substitution criteria. While the KTK-R-3/4 does not specify a DC voltage rating in the provided data, it maintains electrical and mechanical compatibility through identical current rating, AC voltage rating, cartridge fuse type, 5AG package classification, and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

The KTK-R-3/4 is the qualified substitute for the DCM-3/4 based on the following engineering criteria:

Electrical Equivalence: Both components share identical current rating (750mA), AC voltage rating (600 VAC), response time (Fast Blow), and fuse type (Cartridge). The KTK-R-3/4 provides enhanced breaking capacity (200kA versus 100kA AC/50kA DC), which represents a performance improvement without introducing incompatibility.

Mechanical Compatibility: Both fuses conform to the 5AG package standard with identical physical dimensions (0.406" Dia x 1.500" L / 10.30mm x 38.10mm). Both require a compatible fuse holder for installation, ensuring drop-in compatibility in existing mechanical assemblies.

Compliance and Certification: The KTK-R-3/4 carries CSA and UL approvals matching the DCM-3/4, with the addition of CE certification. This expanded approval scope supports broader regulatory compliance requirements.

Product Status: The DCM-3/4 is obsolete, while the KTK-R-3/4 maintains active production status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the KTK-R-3/4 be used as a direct replacement for the DCM-3/4 in existing applications?

A: Yes. The KTK-R-3/4 matches all critical electrical parameters (750mA, 600 VAC, Fast Blow) and mechanical specifications (5AG, 10mm x 38mm). Both components require the same holder type and occupy identical physical space. The KTK-R-3/4 provides higher breaking capacity, which does not create incompatibility.

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

A: The 5AG designation identifies a standardized midget cartridge fuse form factor (10mm x 38mm). Both the DCM-3/4 and KTK-R-3/4 conform to this standard, ensuring mechanical interchangeability within compatible fuse holders.

Q: Does the KTK-R-3/4 support DC voltage operation?

A: The provided technical data for the KTK-R-3/4 specifies 600 VAC operation. DC voltage capability is not documented in the available parameters. Applications requiring 600 VDC operation should be evaluated based on complete component documentation.

Q: Why does the KTK-R-3/4 have a higher breaking capacity than the DCM-3/4?

A: The KTK-R-3/4 (200kA) exceeds the DCM-3/4 (100kA AC, 50kA DC) in breaking capacity. This represents an enhancement in fault protection capability and does not introduce substitution incompatibility. Higher breaking capacity indicates improved performance under fault conditions.

Q: Are there any compliance differences between these components?

A: The DCM-3/4 carries CSA and UL approvals. The KTK-R-3/4 carries CE, CSA, and UL approvals. The expanded certification scope of the KTK-R-3/4 supports additional regulatory frameworks without compromising existing approvals.

Q: What is the inventory status for each component?

A: The DCM-3/4 has 808 pieces available in new original stock but is classified as obsolete. The KTK-R-3/4 has 933 pieces available and maintains active product status, ensuring continued availability for future procurement.