1C4UM 4A Circuit Breaker Equivalent & Substitute Parts

Part Overview

The 1C4UM is a single-pole thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 4A at 480V AC and 42V DC with lever actuation on DIN rail mounting. This component is active in production and ROHS3 compliant. Substitute parts become necessary when the primary part is unavailable, when voltage requirements differ for specific applications, or when inventory constraints require alternative sourcing from the same manufacturer's compatible product line.

Substiute Parts

1C4UM

Altech CorporationIn Stock: 7911C4UM Datasheet

Current PartRFQ

1D4UM

Altech CorporationIn Stock: 8691D4UM Datasheet

Parametric EquivalentRFQ

1E4UM

Altech CorporationIn Stock: 6621E4UM Datasheet

Parametric EquivalentRFQ

1G4UM

Altech CorporationIn Stock: 9051G4UM Datasheet

Parametric EquivalentRFQ

1Z4UM

Altech CorporationIn Stock: 9971Z4UM Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1C4UM is determined by the following critical parameters that must remain constant across all equivalent parts:

• Manufacturer: Altech Corporation
• Series: V-EA
• Breaker Type: Thermal Magnetic
• Current Rating: 4A
• Mounting Type: DIN Rail
• Actuator Type: Lever
• Number of Poles: 1
• DC Voltage Rating: 42V

The substitute parts 1D4UM, 1E4UM, 1G4UM, and 1Z4UM maintain all core electrical and mechanical parameters. The primary distinction among these parts is the AC voltage rating: the 1C4UM and 1D4UM are rated for 480V AC, while 1E4UM, 1G4UM, and 1Z4UM are rated for 277V AC. This voltage differentiation reflects different circuit protection requirements for specific industrial and commercial applications.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active production status and ROHS3 compliance. The 1C4UM and 1D4UM are functionally equivalent with identical electrical ratings and certifications including VDE approval. Selection between these two 480V-rated options depends on inventory availability and lead time requirements.

For applications requiring 277V AC operation, the 1E4UM, 1G4UM, and 1Z4UM are direct substitutes. These parts carry CSA and UL508 certifications. The absence of VDE certification on the 277V variants should be confirmed against specific regulatory requirements for the intended application geography and industry sector.

All parts share identical mechanical mounting, actuator design, and DC voltage capability, ensuring physical and functional interchangeability within their respective voltage classes.

Frequently Asked Questions (FAQ)

Q: Can 1E4UM, 1G4UM, or 1Z4UM be used as direct replacements for 1C4UM?

A: No. The 1C4UM is rated for 480V AC, while 1E4UM, 1G4UM, and 1Z4UM are rated for 277V AC. Substitution is only permissible when the application circuit operates at 277V AC. Voltage mismatch will result in improper circuit protection.

Q: What is the difference between 1C4UM and 1D4UM?

A: Both parts are rated for 480V AC and 4A with identical mechanical and electrical specifications. They are parametric equivalents and interchangeable for 480V applications.

Q: Are 1E4UM, 1G4UM, and 1Z4UM interchangeable with each other?

A: Yes. All three parts share identical electrical ratings (4A, 277V AC, 42V DC), mechanical mounting, and certifications. They are parametric equivalents for 277V AC applications.

Q: Does the absence of VDE certification on 277V variants affect compatibility?

A: VDE certification presence or absence depends on application requirements. The 1C4UM and 1D4UM include VDE approval; the 277V variants do not. Confirm certification requirements with your system design specifications and regional compliance standards before substitution.

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

A: Yes. All substitute parts are supplied in bulk packaging consistent with the 1C4UM.