Circuit Breaker Thermal Magnetic 4420.0409 - Equivalent & Substitute Parts

Part Overview

The SCHURTER 4420.0409 is a thermal magnetic circuit breaker rated for 45A at 480V AC and 65V DC, designed for DIN rail mounting with lever actuation and 2-pole configuration. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system maintenance and new installations where original stock is depleted.

Substiute Parts

4420.0409

SCHURTER Inc.In Stock: 7324420.0409 Datasheet

Current PartRFQ

4230-T120-K0CU-50A

E-T-AIn Stock: 7754230-T120-K0CU-50A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCHURTER 4420.0409 is based on the following critical parameters that must align for functional equivalence:

• Mounting Type: DIN Rail (required match)
• Breaker Type: Thermal Magnetic (required match)
• Actuator Type: Lever (required match)
• Number of Poles: 2 (required match)
• Voltage Rating - AC: 480V (required match)
• Current Rating: 45A nominal; tolerance for higher ratings acceptable within system design limits
• Voltage Rating - DC: 65V nominal; higher ratings provide enhanced capability
• Approval Agencies: Compliance with relevant standards (CSA, UL, EN, IEC, GB)

The E-T-A 4230-T120-K0CU-50A satisfies these substitution criteria with the following considerations: identical mounting, breaker type, actuator, pole configuration, and AC voltage rating; current rating of 50A exceeds the 45A requirement; DC voltage rating of 125V exceeds the 65V requirement.

Parameter Comparison

Engineering Selection Recommendations

The E-T-A 4230-T120-K0CU-50A is a direct functional substitute for the obsolete SCHURTER 4420.0409. Selection is supported by:

• Active Product Status: The E-T-A component is currently in active production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status. The E-T-A component carries UL489 and CSA C22.2 No 235 certifications, providing equivalent or enhanced approval coverage.
• Parameter Alignment: Identical mounting, breaker type, actuator mechanism, pole configuration, and AC voltage rating ensure mechanical and electrical compatibility within the original application envelope.
• Enhanced Ratings: The 50A current rating and 125V DC rating of the substitute provide operational margin above the original 45A and 65V specifications, supporting system reliability without derating.

Frequently Asked Questions (FAQ)

Q: Can the E-T-A 4230-T120-K0CU-50A directly replace the SCHURTER 4420.0409 in existing installations?

A: Yes. Both components share identical mounting type (DIN Rail), breaker type (Thermal Magnetic), actuator type (Lever), pole configuration (2-pole), and AC voltage rating (480V). The substitute's higher current and DC voltage ratings do not compromise compatibility.

Q: What is the significance of the current rating difference (45A vs. 50A)?

A: The E-T-A component's 50A rating exceeds the original 45A specification. In applications designed for 45A operation, the substitute will not trip prematurely. The higher rating provides operational margin and does not create a compatibility issue.

Q: Does the higher DC voltage rating (125V vs. 65V) affect substitution suitability?

A: No. A higher DC voltage rating indicates enhanced capability and does not compromise performance in applications rated for 65V DC. The component will operate safely within the original voltage envelope.

Q: Are there packaging differences between these components?

A: The SCHURTER component is packaged as individual units; the E-T-A component is supplied in bulk packaging. This distinction affects procurement and inventory management but does not impact functional equivalence.

Q: What certifications should be verified for the substitute in regulated applications?

A: The E-T-A 4230-T120-K0CU-50A carries CSA C22.2 No 235 and UL489 certifications. Verify that these certifications meet the specific regulatory requirements of your application, as the original SCHURTER component referenced additional standards (EN 60934, GB 17701, IEC 60934, UL1077, UL508).