1D40UM 40A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The 1D40UM is a thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 40A at 480V AC and 24V DC. This single-pole DIN rail-mounted breaker with lever actuation is designed for industrial control and distribution applications. The product is active and widely available with 673 units in stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and approval certifications to support procurement flexibility and supply chain continuity.

Substiute Parts

1D40UM

Altech CorporationIn Stock: 7021D40UM Datasheet

Current PartRFQ

1C40UM

Altech CorporationIn Stock: 9811C40UM Datasheet

Parametric EquivalentRFQ

1E40UM

Altech CorporationIn Stock: 10951E40UM Datasheet

Parametric EquivalentRFQ

1G40UM

Altech CorporationIn Stock: 10351G40UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1D40UM are identified based on the following critical parameters that determine functional interchangeability:

Matching Parameters (Required for Substitution):

• Current Rating: 40A
• Breaker Type: Thermal Magnetic
• Mounting Type: DIN Rail
• Number of Poles: 1
• Actuator Type: Lever
• Series: V-EA
• Approval Agency: CSA, UL508
• Product Status: Active

Variable Parameters (Allowed to Differ):

• Voltage Rating - AC: 480V (1D40UM, 1C40UM) or 277V (1E40UM, 1G40UM)
• Base Product Number: 1D40, 1C40, 1E40, or 1G40

The 1D40UM has three parametric equivalents: 1C40UM, 1E40UM, and 1G40UM. All four parts share identical current ratings, breaker topology, mounting configuration, and certifications. The primary distinction is the AC voltage rating, which determines the appropriate application context.

Parameter Comparison

Engineering Selection Recommendations

All four parts—1D40UM, 1C40UM, 1E40UM, and 1G40UM—are active products with identical certifications (CSA, UL508) and full ROHS3 compliance. Selection between these parts is determined by the system voltage requirement:

For 480V AC systems: Select 1D40UM or 1C40UM. Both are rated for 480V AC operation and are mechanically and electrically interchangeable within this voltage class.

For 277V AC systems: Select 1E40UM or 1G40UM. Both are rated for 277V AC operation and are mechanically and electrically interchangeable within this voltage class.

All parts maintain identical 40A current ratings, thermal-magnetic trip characteristics, DIN rail mounting, and single-pole lever-actuated configuration. Cross-voltage substitution (480V to 277V or vice versa) is not permitted and will result in improper circuit protection or equipment damage.

Frequently Asked Questions (FAQ)

Q: Can 1D40UM be substituted with 1E40UM or 1G40UM?

A: No. The 1D40UM is rated for 480V AC, while 1E40UM and 1G40UM are rated for 277V AC. Voltage rating mismatches compromise circuit protection integrity and violate equipment specifications. Use only parts rated for your system voltage.

Q: What is the difference between 1D40UM and 1C40UM?

A: Both parts are identical in all electrical and mechanical parameters. They share the same 40A rating, 480V AC voltage class, thermal-magnetic trip type, DIN rail mounting, and certifications. They are fully interchangeable for 480V AC applications.

Q: Are 1E40UM and 1G40UM interchangeable?

A: Yes. Both parts are identical in all electrical and mechanical parameters. They share the same 40A rating, 277V AC voltage class, thermal-magnetic trip type, DIN rail mounting, and certifications. They are fully interchangeable for 277V AC applications.

Q: Do all substitute parts have the same approval certifications?

A: Yes. All four parts—1D40UM, 1C40UM, 1E40UM, and 1G40UM—carry CSA and UL508 approvals and are ROHS3 compliant.

Q: Can these breakers be used in both AC and DC circuits?

A: These breakers are rated for both AC and DC operation. All parts are rated for 24V DC in addition to their respective AC voltage ratings (480V or 277V). Application context determines which voltage rating applies.

Q: What is the packaging format for these parts?

A: All parts are supplied in bulk packaging, suitable for direct installation on DIN rail systems without additional mounting hardware.