DM20-BU Terminal Block Connector Equivalent & Substitute Parts

Part Overview

The DM20-BU is a 2-position feed-through terminal block connector manufactured by Eaton - Bussmann Electrical Division, part of the Magnum® DM series. This component is designed for screw termination of conductors in the 12-22 AWG range with a rated current of 24 A (IEC) and voltage of 500V (IEC). The product is currently obsolete, making identification of functionally equivalent alternatives necessary for ongoing maintenance, repair, and system continuity applications.

Substiute Parts

DM20-BU

Eaton - Bussmann Electrical DivisionIn Stock: 807DM20-BU Datasheet

Current PartRFQ

1040880000

WeidmüllerIn Stock: 7971040880000 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM20-BU is determined by strict equivalence across the following critical parameters:

• Electrical Compatibility: Current rating (IEC minimum 24 A), voltage rating (IEC minimum 500V), and wire gauge range (12-22 AWG)
• Mechanical Compatibility: 2-position, 1-level feed-through configuration with 5.1mm terminal width and screw termination
• Physical Form Factor: Blue color and polyamide insulation material
• Regulatory Compliance: UL94 V-0 flammability rating and RoHS compliance

The substitute part 1040880000 (Weidmüller) meets or exceeds all critical parameters while maintaining active product status and full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The Weidmüller part number 1040880000 is a direct functional equivalent to the obsolete DM20-BU. Selection of this substitute is based on the following engineering criteria:

• Electrical Equivalence: Both parts meet IEC 24 A / 500V ratings. The Weidmüller substitute exceeds UL ratings (25 A / 600V vs. 20 A / 300V), providing additional margin for UL-regulated applications.
• Mechanical Compatibility: Identical 2-position, 1-level feed-through configuration with matching 5.1mm terminal width and screw termination ensures direct mechanical fit and installation compatibility.
• Regulatory Compliance: Both parts carry UL94 V-0 flammability certification and RoHS compliance, meeting current regulatory requirements.
• Product Availability: The Weidmüller part maintains active product status with current manufacturing support, ensuring long-term availability and supply chain continuity.
• Wire Gauge Accommodation: The Weidmüller substitute accepts wire gauges up to 4mm² (vs. 2.5mm² for the original), providing flexibility for applications requiring larger conductor cross-sections within the 12-22 AWG range.

Frequently Asked Questions (FAQ)

Q: Can the Weidmüller 1040880000 be used as a direct replacement for the DM20-BU in existing installations?

A: Yes. Both parts share identical electrical ratings (IEC 24 A / 500V), mechanical configuration (2-position feed-through), and terminal geometry (5.1mm width). The Weidmüller part is mechanically and electrically interchangeable with the DM20-BU.

Q: What is the difference in insulation material between the two parts?

A: The DM20-BU uses Polyamide (PA66) / Nylon 6/6, while the Weidmüller 1040880000 uses Thermoplastic Wemid. Both materials meet UL94 V-0 flammability requirements and are functionally equivalent for this application.

Q: Does the Weidmüller part support the same wire gauge range?

A: Yes. Both parts accept 12-22 AWG conductors. The Weidmüller substitute accommodates wire cross-sections up to 4mm² compared to 2.5mm² for the original, providing additional flexibility without reducing compatibility.

Q: Are there any packaging differences between the two parts?

A: The DM20-BU is supplied in standard packaging, while the Weidmüller 1040880000 is supplied in bulk packaging. This does not affect electrical or mechanical performance.

Q: Why is the DM20-BU obsolete?

A: The DM20-BU is classified as obsolete by the manufacturer. The Weidmüller 1040880000 represents the current active equivalent, ensuring access to supported, in-production components for new designs and ongoing system maintenance.