Altech Corporation 3G40UM 40A Thermal Magnetic Circuit Breaker

Part Overview

The 3G40UM is a three-pole thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 40A at 480V AC and 60V DC. This DIN rail-mounted device features lever actuation and is part of the V-EA series. The breaker is actively produced and holds CSA and UL508 certifications, making it suitable for industrial control and distribution applications requiring reliable overcurrent protection.

Equivalent substitute parts exist within the same V-EA series, differentiated by thermal characteristic curves (G, B, C, E, and Z designations). These alternatives provide identical electrical and mechanical parameters while offering different trip characteristics to match specific application requirements.

Substiute Parts

3G40UM

Altech CorporationIn Stock: 9113G40UM Datasheet

Current PartRFQ

3B40UM

Altech CorporationIn Stock: 9493B40UM Datasheet

Parametric EquivalentRFQ

3C40UM

Altech CorporationIn Stock: 10253C40UM Datasheet

Parametric EquivalentRFQ

3E40UM

Altech CorporationIn Stock: 7873E40UM Datasheet

Parametric EquivalentRFQ

3Z40UM

Altech CorporationIn Stock: 9633Z40UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The 3G40UM and its substitutes (3B40UM, 3C40UM, 3E40UM, 3Z40UM) are parametrically equivalent based on the following criteria:

Identical Parameters Across All Substitutes:

• Current Rating: 40A
• Voltage Rating - AC: 480V
• Voltage Rating - DC: 60V
• Number of Poles: 3
• Breaker Type: Thermal Magnetic
• Mounting Type: DIN Rail
• Actuator Type: Lever
• Series: V-EA
• Packaging: Bulk
• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected
• ECCN: EAR99
• HTSUS: 8536.20.0020

Differentiating Factor: The letter designation in each part number (G, B, C, E, Z) indicates the thermal characteristic curve of the breaker. This characteristic determines the trip time response to overcurrent conditions. All five variants maintain identical electrical ratings and mechanical specifications, allowing substitution based on application-specific thermal response requirements.

Parameter Comparison

Engineering Selection Recommendations

All five circuit breaker variants are actively produced and maintain ROHS3 compliance and REACH unaffected status. Selection between 3G40UM and its substitutes should be based on the required thermal characteristic curve for the specific application.

The 3C40UM holds UL508 certification only, while 3G40UM, 3B40UM, 3E40UM, and 3Z40UM hold both CSA and UL508 certifications. Applications requiring dual certification should exclude 3C40UM.

All parts are supplied in bulk packaging and are suitable for direct substitution in DIN rail-mounted three-pole control circuits rated for 40A at 480V AC or 60V DC.

Frequently Asked Questions (FAQ)

Q: Can I substitute 3G40UM with 3B40UM, 3C40UM, 3E40UM, or 3Z40UM?

A: Yes. All five part numbers are parametrically equivalent in current rating (40A), voltage ratings (480V AC / 60V DC), pole configuration (3-pole), breaker type (thermal magnetic), mounting method (DIN rail), and actuator type (lever). The letter designation indicates thermal characteristic curve only.

Q: What is the difference between the G, B, C, E, and Z designations?

A: These letters represent different thermal characteristic curves that define the trip time response to overcurrent conditions. The electrical and mechanical specifications remain identical across all variants.

Q: Does 3C40UM have the same certifications as 3G40UM?

A: No. The 3G40UM holds CSA and UL508 certifications, while 3C40UM holds UL508 certification only. Applications requiring CSA certification should use 3G40UM, 3B40UM, 3E40UM, or 3Z40UM.

Q: Are all substitutes available in the same bulk packaging?

A: Yes. All five part numbers are supplied in bulk packaging with current inventory levels ranging from 741 to 936 pieces.

Q: Can these breakers be used interchangeably in existing installations?

A: Substitution is mechanically and electrically compatible. However, the thermal characteristic curve difference may affect trip response times. Application requirements should determine which characteristic curve is appropriate.