1D3UM Thermal Magnetic Circuit Breaker Equivalent & Substitute Parts

Part Overview

The 1D3UM is a single-pole thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 3A current with 480V AC and 42V DC voltage capability. This DIN Rail-mounted breaker features lever actuation and is part of the V-EA series. The product is active and widely stocked (677 units available), making it a standard component for industrial electrical protection applications. Substitute parts are identified when inventory constraints, regional availability, or specific voltage requirements necessitate alternative sourcing while maintaining equivalent electrical and mechanical performance.

Substiute Parts

1D3UM

Altech CorporationIn Stock: 7091D3UM Datasheet

Current PartRFQ

1C3UM

Altech CorporationIn Stock: 11731C3UM Datasheet

Parametric EquivalentRFQ

1E3UM

Altech CorporationIn Stock: 9421E3UM Datasheet

Parametric EquivalentRFQ

1Z3UM

Altech CorporationIn Stock: 11491Z3UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1D3UM is determined by the following critical parameters:

• Current Rating: Must be 3A (non-negotiable for circuit protection coordination)
• Breaker Type: Must be Thermal Magnetic (functional requirement)
• Mounting Type: Must be DIN Rail (mechanical compatibility)
• Actuator Type: Must be Lever (interface requirement)
• Number of Poles: Must be 1 (electrical configuration)
• Voltage Rating - AC: 480V AC or lower (480V is the maximum specified for 1D3UM)
• Voltage Rating - DC: 42V DC (standard across all equivalent parts)
• Series: V-EA (product family consistency)
• Approval Agencies: Must include CSA and UL508 minimum (regulatory compliance)

The 1D3UM has three identified substitutes: 1C3UM, 1E3UM, and 1Z3UM. All three maintain identical current rating, breaker type, mounting, actuator type, pole count, and DC voltage rating. The primary distinction is AC voltage rating: 1C3UM matches the full 480V AC specification, while 1E3UM and 1Z3UM are rated for 277V AC, making them suitable for lower-voltage applications where 480V capability is not required.

Parameter Comparison

Engineering Selection Recommendations

1C3UM is the direct parametric equivalent to 1D3UM. Both parts share identical electrical ratings (3A, 480V AC, 42V DC) and mechanical specifications. Selection of 1C3UM over 1D3UM is justified by higher inventory availability (1162 units versus 677 units) and identical regulatory compliance (CSA, UL508, VDE). This substitute is appropriate for any application currently specified for 1D3UM without design modification.

1E3UM and 1Z3UM are suitable substitutes only when the application circuit operates at 277V AC or lower. Both parts maintain the 3A current rating, 42V DC capability, and DIN Rail mounting required for mechanical compatibility. However, these parts carry CSA and UL508 approval only, lacking VDE certification present in 1D3UM and 1C3UM. Selection of 1E3UM or 1Z3UM requires confirmation that the installation does not require VDE compliance and that the 277V AC rating is adequate for the intended circuit voltage.

All substitute parts are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original 1D3UM specification.

Frequently Asked Questions (FAQ)

Q: Can 1E3UM or 1Z3UM be used in a 480V AC circuit? A: No. The 1E3UM and 1Z3UM are rated for 277V AC maximum. Using these parts in a 480V AC circuit exceeds their voltage rating and violates electrical safety standards. Use 1D3UM or 1C3UM for 480V AC applications.

Q: What is the difference between 1E3UM and 1Z3UM? A: Both parts are electrically and mechanically identical across all provided parameters. The designation difference (E versus Z character) reflects internal Altech Corporation product coding. Selection between these two parts can be based on inventory availability or lead time considerations.

Q: Is 1C3UM a complete replacement for 1D3UM? A: Yes. The 1C3UM is a parametric equivalent with identical electrical ratings, mechanical specifications, and regulatory approvals (CSA, UL508, VDE). Direct substitution is permissible without circuit redesign.

Q: Do all substitute parts have the same DIN Rail mounting compatibility? A: Yes. All four parts (1D3UM, 1C3UM, 1E3UM, 1Z3UM) are DIN Rail-mounted with lever actuation, ensuring mechanical interchangeability in standard DIN Rail enclosures.

Q: Are there any compliance differences between the substitute parts? A: Yes. The 1D3UM and 1C3UM carry CSA, UL508, and VDE approvals. The 1E3UM and 1Z3UM carry CSA and UL508 approvals only. If VDE certification is required by the application or regional standard, use 1D3UM or 1C3UM only.

Q: Can these parts be used interchangeably in existing installations? A: Interchangeability depends on the circuit voltage and compliance requirements. For 480V AC circuits with VDE compliance requirements, only 1D3UM and 1C3UM are suitable. For 277V AC circuits without VDE requirements, all four parts are compatible. Verify circuit voltage and regulatory requirements before substitution.