3G8UM Equivalent & Substitute Parts

Part Overview

The 3G8UM is a three-pole thermal magnetic circuit breaker manufactured by Altech Corporation, part of the V-EA series. This DIN rail-mounted breaker is rated for 8A at 480V AC and 80V DC, featuring lever actuation and CSA/UL508 approval. The product is active and in stock with 879 units available. Equivalent substitute parts are necessary when primary inventory is unavailable, when specific thermal characteristics are required for application tuning, or when alternative approval certifications are needed for regional compliance.

Substiute Parts

3G8UM

Altech CorporationIn Stock: 9723G8UM Datasheet

Current PartRFQ

3C8UM

Altech CorporationIn Stock: 10523C8UM Datasheet

Parametric EquivalentRFQ

3D8UM

Altech CorporationIn Stock: 9883D8UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3G8UM has two parametric equivalents within the V-EA series: 3C8UM and 3D8UM. Substitution eligibility is determined by matching the following critical parameters:

• Current Rating: 8A (all equivalents match)
• Voltage Rating - AC: 480V (all equivalents match)
• Voltage Rating - DC: 80V (all equivalents match)
• Breaker Type: Thermal Magnetic (all equivalents match)
• Number of Poles: 3 (all equivalents match)
• Mounting Type: DIN Rail (all equivalents match)
• Actuator Type: Lever (all equivalents match)
• Series: V-EA (all equivalents match)

The primary distinction between these parts is the thermal characteristic designation (G, C, and D), which defines the trip curve behavior. All three parts share identical electrical ratings, mechanical form factor, and regulatory approvals, making them interchangeable from an installation and connectivity standpoint.

Parameter Comparison

Engineering Selection Recommendations

All three parts—3G8UM, 3C8UM, and 3D8UM—are active products with full regulatory compliance. The 3C8UM and 3D8UM offer extended approval coverage with VDE certification in addition to CSA and UL508, providing broader regional acceptance. Selection between these equivalents should be based on application-specific thermal curve requirements and regional certification mandates. All parts maintain ROHS3 compliance and are available in bulk packaging with current inventory levels of 879, 967, and 883 units respectively.

Frequently Asked Questions (FAQ)

Q: Can 3C8UM or 3D8UM be used as direct replacements for 3G8UM in existing installations?

A: Yes. All three parts share identical electrical ratings (8A, 480V AC, 80V DC), mechanical form factor (3-pole, DIN rail, lever actuation), and core regulatory approvals (CSA, UL508). They are mechanically and electrically interchangeable for installation purposes.

Q: What is the difference between the G, C, and D designations?

A: These designations indicate the thermal trip curve characteristic of the breaker. The specific trip curve behavior differs between variants, affecting response time to overload conditions. Selection should align with the protected circuit's load characteristics and application requirements.

Q: Do the VDE certifications on 3C8UM and 3D8UM affect compatibility?

A: No. VDE certification is an additional approval that extends regional compliance coverage. The presence of VDE does not alter electrical or mechanical compatibility. Both parts remain fully compatible with installations designed for 3G8UM.

Q: Are all three parts available in the same packaging format?

A: Yes. All three parts are supplied in bulk packaging with comparable inventory levels (879–967 units in stock).

Q: Which part should be selected for new designs?

A: Selection should be based on the specific thermal curve requirement for the application and any regional certification mandates. All three parts are active products suitable for new designs.