Circuit Breaker Thermal Magnetic 1CU20L Equivalent & Substitute Parts

Part Overview

The Altech Corporation 1CU20L is a thermal-magnetic circuit breaker rated for 20A at 277V AC and 125V DC, designed for DIN rail mounting with lever actuation. This component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives to maintain system continuity and procurement flexibility. The part carries CE, cULus, and UL489 certifications, ensuring compliance with international safety standards.

Substiute Parts

1CU20L

Altech CorporationIn Stock: 10511CU20L Datasheet

Current PartRFQ

1C20UL

Altech CorporationIn Stock: 9001C20UL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1CU20L is determined by the following critical parameters that must remain constant:

• Current Rating: 20A
• 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 substitute part 1C20UL meets all these criteria. While the 1C20UL operates at 277V AC without a specified DC voltage rating (versus the 1CU20L's dual 277V AC / 125V DC rating), it maintains identical current capacity, breaker topology, mounting configuration, and regulatory certifications. The absence of a DC voltage specification in the 1C20UL does not preclude substitution in applications where DC operation is not required.

Parameter Comparison

Engineering Selection Recommendations

The 1C20UL is the direct substitute for the discontinued 1CU20L. Both parts are manufactured by Altech Corporation and share identical electrical specifications for AC operation at 277V with 20A capacity. Both maintain active compliance with CE, cULus, and UL489 certifications and ROHS3 standards.

The primary distinction is product status: the 1C20UL is currently active with 856 units in stock, whereas the 1CU20L is discontinued. For applications requiring DC operation at 125V, the DC voltage specification of the 1CU20L must be evaluated against the 1C20UL's unspecified DC capability in the context of the specific circuit design.

Frequently Asked Questions (FAQ)

Q: Can the 1C20UL directly replace the 1CU20L in all applications?

A: The 1C20UL is electrically and mechanically equivalent for AC applications at 277V, 20A. Applications requiring DC operation at 125V should be evaluated based on the specific circuit requirements and the 1C20UL's DC performance characteristics.

Q: Are both parts certified to the same standards?

A: Yes. Both the 1CU20L and 1C20UL carry CE, cULus, and UL489 certifications and are ROHS3 compliant.

Q: What is the difference between the L and UL series designations?

A: The series designation (L versus UL) reflects internal product line classification within Altech Corporation. Both parts maintain identical functional specifications for thermal-magnetic circuit breaking at 20A, 277V AC.

Q: Is the 1C20UL available for immediate procurement?

A: Yes. The 1C20UL is active and has 856 units in stock, providing immediate availability compared to the discontinued 1CU20L.

Q: Do both parts use the same DIN rail mounting interface?

A: Yes. Both parts are designed for standard DIN rail mounting with lever actuation and are mechanically interchangeable in DIN rail installations.