ATR20-A-63S-WB2-B-8.0A-2 Equivalent & Substitute Parts

Part Overview

The ATR20-A-63S-WB2-B-8.0A-2 is a single-pole thermal circuit breaker manufactured by Sensata-Airpax, rated for 8A at 250V AC and 50V DC with push-to-reset panel mount actuation. This component is classified as obsolete, making identification of equivalent and substitute parts essential for system maintenance, repair, and redesign applications where continued supply cannot be guaranteed.

Substiute Parts

ATR20-A-63S-WB2-B-8.0A-2

Sensata-AirpaxIn Stock: 973ATR20-A-63S-WB2-B-8.0A-2 Datasheet

Current PartRFQ

W57-XB1A7A10-10

TE Connectivity Potter & Brumfield RelaysIn Stock: 2819W57-XB1A7A10-10 Datasheet

DirectRFQ

W58-XB1A4A-8

TE Connectivity Potter & Brumfield RelaysIn Stock: 4842W58-XB1A4A-8 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for thermal circuit breakers is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitutes for the ATR20-A-63S-WB2-B-8.0A-2:

Critical Parameters for Substitution:

• Current Rating: Must match or exceed 8A
• Voltage Rating - AC: Must be rated for minimum 250V AC
• Voltage Rating - DC: Must be rated for minimum 50V DC (where applicable)
• Breaker Type: Must be thermal
• Mounting Type: Must be panel mount
• Actuator Type: Must be push to reset
• Number of Poles: Must be single-pole (1)

Two substitute parts meet these criteria:

W58-XB1A4A-8 (Parametric Equivalent): Matches all critical parameters identically—8A current rating, 250V AC, 50V DC, thermal type, panel mount, push to reset, single-pole configuration. Manufactured by TE Connectivity Potter & Brumfield Relays with active product status.

W57-XB1A7A10-10 (Direct Substitute with Current Rating Variance): Meets all critical parameters except current rating is 10A instead of 8A. This higher current rating provides functional compatibility in applications where the 8A threshold is not a limiting design constraint. Manufactured by TE Connectivity Potter & Brumfield Relays with active product status.

Parameter Comparison

Engineering Selection Recommendations

W58-XB1A4A-8 is the primary substitute for direct replacement applications. This part maintains identical electrical specifications (8A, 250V AC, 50V DC) and mechanical configuration, ensuring functional equivalence without design modification. The part carries active product status with ROHS3 compliance and REACH unaffected designation, supporting long-term supply continuity and regulatory compliance.

W57-XB1A7A10-10 is suitable for applications where circuit protection at 10A is acceptable within system design parameters. The elevated current rating provides additional margin and may be advantageous in systems with transient current conditions. This part also maintains active product status with equivalent compliance certifications. Selection of this substitute requires confirmation that the 10A rating does not exceed circuit protection requirements.

Both substitutes are manufactured by TE Connectivity Potter & Brumfield Relays, a qualified supplier with established thermal circuit breaker product lines. Both parts are available in active production with documented inventory levels.

Frequently Asked Questions (FAQ)

Q: Can W58-XB1A4A-8 be used as a direct replacement for ATR20-A-63S-WB2-B-8.0A-2?

A: Yes. W58-XB1A4A-8 matches all critical electrical and mechanical parameters: 8A current rating, 250V AC, 50V DC voltage ratings, thermal breaker type, panel mount configuration, push-to-reset actuation, and single-pole design. No circuit modification is required.

Q: What is the difference between the two substitute parts?

A: W58-XB1A4A-8 provides parametric equivalence with identical 8A current rating. W57-XB1A7A10-10 provides functional substitution with a 10A current rating. Both maintain identical voltage ratings, mounting type, actuator type, and pole configuration.

Q: Can W57-XB1A7A10-10 be used in place of the original part?

A: W57-XB1A7A10-10 is functionally compatible if the application design permits a 10A protection threshold instead of 8A. The higher current rating does not compromise safety in applications where 10A protection is acceptable. Confirmation of circuit requirements is necessary before selection.

Q: What is the packaging format for these substitutes?

A: Both W58-XB1A4A-8 and W57-XB1A7A10-10 are supplied in tray packaging format.

Q: Are the substitute parts compliant with current regulatory standards?

A: Both substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.

Q: Why is the original ATR20-A-63S-WB2-B-8.0A-2 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts from active product lines ensure continued availability for maintenance and repair applications.