Circuit Breaker Thermal Magnetic 1CU5L Equivalent & Substitute Parts

Part Overview

The 1CU5L is a thermal magnetic circuit breaker manufactured by Altech Corporation, designed for DIN rail mounting applications. This single-pole breaker operates at 5A current rating with dual voltage capability (277 V AC / 125 V DC) and features lever actuation. The product is classified as obsolete, making identification of functionally equivalent active alternatives essential for system maintenance and component procurement.

Substiute Parts

1CU5L

Altech CorporationIn Stock: 8951CU5L Datasheet

Current PartRFQ

1C5UL

Altech CorporationIn Stock: 8201C5UL Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1CU5L is determined by strict equivalence across the following critical parameters:

• Current Rating: 5A (exact match required)
• Voltage Rating - AC: 277 V (exact match required)
• Breaker Type: Thermal Magnetic (exact match required)
• Mounting Type: DIN Rail (exact match required)
• Number of Poles: 1 (exact match required)
• Actuator Type: Lever (exact match required)
• Approval Agencies: CE, cULus, UL489 (minimum compliance required)

The 1C5UL meets all substitution criteria. While the 1C5UL does not specify a DC voltage rating in the provided data, it maintains functional equivalence across all other critical parameters and represents an active product status alternative to the obsolete 1CU5L.

Parameter Comparison

Engineering Selection Recommendations

The 1C5UL is the direct functional equivalent for 1CU5L replacement applications. Selection is based on the following engineering criteria:

• Both parts maintain identical electrical specifications across current rating, AC voltage rating, and breaker topology
• The 1C5UL carries active product status, ensuring continued availability and supply chain reliability
• Both parts hold equivalent regulatory certifications (CE, cULus, UL489), confirming compliance with applicable safety standards
• ROHS3 compliance is maintained in the substitute part, meeting environmental regulatory requirements
• Mechanical compatibility is assured through identical DIN rail mounting, single-pole configuration, and lever actuation

Frequently Asked Questions (FAQ)

Q: Can the 1C5UL directly replace the 1CU5L in existing installations?

A: Yes. The 1C5UL meets all critical electrical and mechanical parameters required for direct substitution. Both parts share identical current rating (5A), AC voltage rating (277 V), breaker type (thermal magnetic), mounting configuration (DIN rail), pole count (1), and actuator type (lever). Regulatory certifications are equivalent.

Q: What is the significance of the 1CU5L being obsolete?

A: Obsolete status indicates the part is no longer manufactured or supported by Altech Corporation. The 1C5UL, classified as active, represents the current production equivalent and is the recommended selection for new procurement and system maintenance.

Q: Does the 1C5UL support DC voltage operation?

A: The provided technical data for the 1C5UL does not specify a DC voltage rating. If DC voltage operation at 125 V is required for your application, this parameter must be verified with the manufacturer or authorized distributor before final selection.

Q: Are there packaging differences between these parts?

A: The 1CU5L packaging is listed as unspecified, while the 1C5UL is supplied in bulk packaging. Packaging differences do not affect electrical or mechanical performance and are determined by procurement requirements and inventory management practices.

Q: What certifications apply to both parts?

A: Both the 1CU5L and 1C5UL hold CE, cULus, and UL489 certifications, confirming compliance with European and North American safety standards for circuit protection devices.