APL1-1-59-503 Equivalent & Substitute Parts

Part Overview

The APL1-1-59-503 is a single-pole circuit breaker with magnetic-hydraulic delay protection, rated for 50A at 277V AC and 65V DC. Manufactured by Sensata Technologies – Airpax, this lever-actuated panel mount breaker is classified as obsolete. Due to its discontinued status, identifying equivalent substitute parts is essential for system maintenance, repair, and replacement applications where continued availability and supply chain reliability are required.

Substiute Parts

APL1-1-59-503

Sensata Technologies – AirpaxIn Stock: 910APL1-1-59-503 Datasheet

Current PartRFQ

W91-X112-50

TE Connectivity Potter & Brumfield RelaysIn Stock: 1009W91-X112-50 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the APL1-1-59-503 is determined by strict equivalence across the following critical parameters:

• Breaker Type: Magnetic (Hydraulic Delay) protection mechanism
• Current Rating: 50A
• Voltage Rating – AC: 277V
• Voltage Rating – DC: Not specified for substitute (AC rating is primary criterion)
• Mounting Type: Panel Mount
• Actuator Type: Lever
• Number of Poles: 1

The substitute part W91-X112-50 meets all these criteria, establishing functional and mechanical compatibility for direct replacement applications.

Parameter Comparison

Engineering Selection Recommendations

The W91-X112-50 manufactured by TE Connectivity Potter & Brumfield Relays is the direct substitute for the obsolete APL1-1-59-503. Both parts share identical electrical ratings (50A, 277V AC), mechanical configuration (panel mount, lever actuator, single pole), and protection mechanism (magnetic-hydraulic delay).

The W91-X112-50 carries active product status, ensuring ongoing availability and supply chain continuity. The substitute maintains RoHS non-compliant status consistent with the component category and vintage. Both parts are classified under ECCN EAR99 and HTSUS 8536.20.0020, confirming regulatory equivalence for export and tariff purposes.

Frequently Asked Questions (FAQ)

Q: Can the W91-X112-50 directly replace the APL1-1-59-503 in existing installations?

A: Yes. Both parts are single-pole, 50A, 277V AC circuit breakers with magnetic-hydraulic delay protection and lever-actuated panel mount configuration. Electrical and mechanical parameters are identical, supporting direct substitution.

Q: What is the significance of the APL1-1-59-503 being obsolete?

A: Obsolete status indicates the part is no longer manufactured by Sensata Technologies – Airpax. The W91-X112-50 provides an active, continuously available alternative with equivalent specifications.

Q: Are there differences in packaging between these parts?

A: The APL1-1-59-503 packaging is not specified in available documentation. The W91-X112-50 is supplied in bulk packaging. Packaging differences do not affect electrical or mechanical compatibility.

Q: Does RoHS compliance status affect substitution suitability?

A: Both parts are RoHS non-compliant, maintaining regulatory consistency. RoHS status does not impact functional substitution for this component category.

Q: What parameters must remain identical for substitution to be valid?

A: Current rating (50A), AC voltage rating (277V), breaker type (magnetic-hydraulic delay), mounting configuration (panel mount), actuator type (lever), and pole count (1) must all match. The W91-X112-50 meets all these requirements.