Circuit Breaker Thermal Magnetic 1CU3L Equivalent & Substitute Parts

Part Overview

The 1CU3L is a single-pole thermal magnetic circuit breaker manufactured by Altech Corporation, rated for 3A at 277V AC and 125V DC with lever actuation on DIN rail mounting. This component is classified as obsolete, making identification of functionally equivalent active alternatives essential for system maintenance and new installations. The 1CU3L meets CE, cULus, and UL489 approval standards and maintains ROHS3 compliance.

Substiute Parts

1CU3L

Altech CorporationIn Stock: 10401CU3L Datasheet

Current PartRFQ

1C3UL

Altech CorporationIn Stock: 8281C3UL Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1CU3L is determined by the following critical parameters that must remain constant:

• Current Rating: 3A
• Voltage Rating - AC: 277V
• Breaker Type: Thermal Magnetic
• Mounting Type: DIN Rail
• Actuator Type: Lever
• Number of Poles: 1
• Approval Agencies: CE, cULus, UL489

The 1C3UL meets all these requirements and is classified as an active product, making it a direct functional equivalent for the obsolete 1CU3L.

Parameter Comparison

Engineering Selection Recommendations

The 1C3UL is the direct substitute for the obsolete 1CU3L. Both components share identical electrical ratings (3A, 277V AC), mechanical configuration (single-pole lever-actuated DIN rail mount), and thermal magnetic protection characteristics. Both maintain ROHS3 compliance and carry CE, cULus, and UL489 certifications, ensuring regulatory equivalence. The 1C3UL's active product status provides supply continuity and ongoing manufacturer support, making it the appropriate selection for replacement applications.

Frequently Asked Questions (FAQ)

Q: Can the 1C3UL directly replace the 1CU3L in existing installations?

A: Yes. The 1C3UL maintains identical current rating (3A), AC voltage rating (277V), breaker type (thermal magnetic), mounting configuration (DIN rail), and actuator type (lever). Both components carry the same approval certifications (CE, cULus, UL489).

Q: What is the primary reason to substitute the 1CU3L?

A: The 1CU3L is classified as obsolete. The 1C3UL is an active product from the same manufacturer with equivalent electrical and mechanical specifications, ensuring continued availability and supply reliability.

Q: Are there packaging differences between these parts?

A: The 1CU3L is supplied in standard packaging, while the 1C3UL is supplied in bulk packaging. This does not affect functional compatibility or electrical performance.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 1CU3L and 1C3UL carry CE, cULus, and UL489 certifications and maintain ROHS3 compliance.

Q: Is DC voltage rating a consideration for substitution?

A: The 1CU3L specifies 125V DC rating. The 1C3UL does not specify a separate DC rating in available documentation. Verify DC application requirements against the 1C3UL datasheet before deployment in DC circuits.