A389403RC Equivalent & Substitute Parts Reference

Part Overview

The A389403RC is a 3-circuit barrier block connector manufactured by Eaton - Electronics Division. This component is classified as a terminal block with screw termination on the top and quick connect termination on the bottom. The part is currently listed as obsolete, making identification of equivalent substitute components essential for system maintenance, repair, and component sourcing in applications where this connector is specified.

Barrier block connectors serve as connection points in electrical systems requiring secure wire termination with electrical isolation between circuits. The A389403RC is designed for applications operating at 600V with current ratings up to 30A per circuit.

Substiute Parts

A389403RC

Eaton - Electronics DivisionIn Stock: 1120A389403RC Datasheet

Current PartRFQ

433300-03-0

Curtis IndustriesIn Stock: 806433300-03-0 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A389403RC requires strict alignment with the following critical parameters that define functional equivalence:

Circuit Configuration: Both the main part and substitute must provide 3 circuits with 3 wire entry points and single-row configuration.

Pitch Tolerance: The A389403RC operates at 0.437" (11.10mm) pitch. The substitute part 433300-03-0 operates at 0.438" (11.12mm) pitch, representing a 0.01mm variance within typical mechanical tolerance ranges for barrier block connectors.

Voltage and Isolation: Both parts maintain 600V voltage rating and dual-wall barrier construction, ensuring equivalent electrical isolation between circuits.

Termination Type: Both parts feature screw-based top termination and insulated quick connect bottom termination, maintaining mechanical and electrical compatibility in the connection interface.

Temperature Rating: Both parts are rated for 105°C operating temperature, supporting equivalent thermal performance in target applications.

Flammability Compliance: Both parts meet UL94 V-0 flammability standards, ensuring equivalent safety certification.

Current Rating Differential: The A389403RC is rated at 30A, while the substitute 433300-03-0 is rated at 20A. This represents a reduction in current capacity and must be evaluated against actual circuit requirements.

Wire Gauge Range: The A389403RC accepts 10-22 AWG wire, while the substitute accepts 12-22 AWG. The substitute does not accommodate 10 AWG wire.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The 433300-03-0 from Curtis Industries can serve as a substitute for the A389403RC in applications where the following conditions are met:

Current Requirement Verification: The application circuit must operate at or below 20A. If the original design requires the full 30A capacity of the A389403RC, the 433300-03-0 is not suitable.

Wire Gauge Compatibility: All wires in the application must fall within the 12-22 AWG range. If 10 AWG wire is specified or used, the 433300-03-0 cannot accommodate this requirement.

Quick Connect Interface: The bottom termination quick connect interface differs between parts (0.250" versus 0.110"). The mating connector or interface must be verified for compatibility with the 0.110" quick connect specification of the substitute part.

Compliance Status: The 433300-03-0 is listed as Active product status with ROHS3 compliance and REACH Unaffected designation, providing current manufacturing support and regulatory compliance for new installations or replacements.

Mechanical Fit: The 0.01mm pitch variance (0.437" to 0.438") falls within standard mechanical tolerance ranges for barrier block connectors and does not present installation or functional issues in typical chassis or panel mounting applications.

Frequently Asked Questions (FAQ)

Q: Can the 433300-03-0 be used as a direct replacement for the A389403RC in all applications?

A: No. The substitute part has two significant limitations: reduced current rating (20A versus 30A) and narrower wire gauge acceptance (12-22 AWG versus 10-22 AWG). Substitution is only valid when circuit current does not exceed 20A and wire gauges remain within 12-22 AWG range.

Q: What is the significance of the pitch difference between 0.437" and 0.438"?

A: The 0.01mm variance represents a tolerance variation typical in barrier block connector manufacturing. This difference does not affect mechanical fit, electrical performance, or circuit isolation in standard applications.

Q: Are the quick connect terminations interchangeable between these two parts?

A: No. The A389403RC uses 0.250" quick connect termination while the 433300-03-0 uses 0.110" quick connect termination. The mating connector or interface must be verified for compatibility before substitution.

Q: What is the difference between Thermoplastic and Polypropylene insulation materials?

A: Both materials meet the same UL94 V-0 flammability rating and 105°C temperature rating. Polypropylene is a specific thermoplastic material. The functional performance in electrical isolation and thermal management is equivalent for this application.

Q: Why is the A389403RC listed as obsolete?

A: Product obsolescence indicates that Eaton - Electronics Division has discontinued manufacturing this part. The 433300-03-0 from Curtis Industries represents an active alternative for sourcing equivalent barrier block connector functionality.

Q: Can I use the 433300-03-0 if my application requires 10 AWG wire?

A: No. The 433300-03-0 minimum wire gauge is 12 AWG. If 10 AWG wire is required, this substitute is not compatible.

Q: What should I verify before implementing the 433300-03-0 as a substitute?

A: Verify three critical parameters: (1) circuit current does not exceed 20A, (2) all wire gauges fall within 12-22 AWG range, and (3) the 0.110" quick connect interface is compatible with existing mating connectors or system interfaces.