Circuit Breaker Thermal Magnetic 4420.0203 - Equivalent & Substitute Parts

Part Overview

The SCHURTER 4420.0203 is a three-pole thermal magnetic circuit breaker rated for 50A at 480V AC and 65V DC, designed for DIN rail mounting with lever actuation. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and replacement applications. The part carries multiple international approvals including UL1077, UL508, IEC 60934, and CSA certifications, establishing its suitability for industrial control and distribution applications.

Substiute Parts

4420.0203

SCHURTER Inc.In Stock: 11044420.0203 Datasheet

Current PartRFQ

3D50UM

Altech CorporationIn Stock: 12053D50UM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete SCHURTER 4420.0203 is determined by strict equivalence across the following critical parameters:

• Current Rating: 50A (exact match required)
• Voltage Rating - AC: 480V (exact match required)
• Breaker Type: Thermal Magnetic (functional equivalence)
• Number of Poles: 3 (exact match required)
• Mounting Type: DIN Rail (exact match required)
• Actuator Type: Lever (exact match required)
• Approval Standards: Compliance with UL508 and CSA certifications (minimum requirement)

The Altech Corporation 3D50UM satisfies all critical substitution criteria. While the SCHURTER part specifies 65V DC rating and the Altech part lists DC capability without specific voltage derating, both parts maintain identical AC voltage ratings, current capacity, pole configuration, and mounting characteristics. Both parts carry ROHS3 compliance and relevant industrial certifications.

Parameter Comparison

Engineering Selection Recommendations

The Altech 3D50UM is the identified equivalent substitute for the obsolete SCHURTER 4420.0203. Selection is based on:

• Functional Equivalence: Both parts are three-pole thermal magnetic circuit breakers with identical current and AC voltage ratings, lever actuation, and DIN rail mounting.
• Active Product Status: The Altech part is currently in active production with confirmed inventory availability (1190 pcs), ensuring supply chain continuity.
• Regulatory Compliance: Both parts maintain ROHS3 compliance and carry UL508 and CSA certifications, satisfying industrial control application requirements.
• Electrical Compatibility: Matching current capacity (50A), AC voltage rating (480V), and pole configuration ensure direct functional replacement in existing installations.

Frequently Asked Questions (FAQ)

Q: Can the Altech 3D50UM directly replace the SCHURTER 4420.0203 in existing installations?

A: Yes. Both parts share identical current ratings (50A), AC voltage ratings (480V), pole configuration (3-pole), mounting type (DIN rail), and actuation method (lever). The Altech part is functionally equivalent for thermal magnetic circuit protection applications.

Q: What is the significance of the SCHURTER part being obsolete?

A: Obsolete status indicates the part is no longer manufactured by SCHURTER. The Altech 3D50UM provides an active, in-stock alternative with equivalent electrical and mechanical specifications, ensuring continued availability for replacement and maintenance applications.

Q: Are there differences in DC voltage ratings between these parts?

A: The SCHURTER part specifies 65V DC rating. The Altech part lists DC capability without a specific voltage derating. Both parts are rated for 480V AC operation. DC application requirements should be evaluated against the specific voltage and current conditions in the target circuit.

Q: Do both parts carry the same certifications?

A: Both parts carry UL508 and CSA certifications. The SCHURTER part includes additional certifications (UL1077, IEC 60934, EN 60934, GB 17701). For applications requiring specific regional or standards compliance, verify that the Altech part's certification portfolio meets the installation requirements.

Q: What is the packaging difference between these parts?

A: The SCHURTER part is supplied with unspecified packaging. The Altech part is supplied in bulk packaging. This distinction affects procurement and inventory management but does not impact electrical or mechanical functionality.