BA-2R SPDT Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The Honeywell BA-2R is a snap action SPDT (Single Pole Double Throw) switch rated for 20A AC at 125V with chassis mount configuration and solder lug termination. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and new design applications where functional compatibility is required.

The BA-2R operates with a round pin plunger actuator and delivers 20,000,000 mechanical cycles with an operating temperature range of -55°C to 85°C. Substitution is driven by product discontinuation and the need for functionally equivalent alternatives that maintain electrical and mechanical performance within specified tolerances.

Substiute Parts

BA-2R

Honeywell Sensing and Productivity SolutionsIn Stock: 902BA-2R Datasheet

Current PartRFQ

A-20G

Omron Automation and SafetyIn Stock: 878A-20G Datasheet

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Z-01H

Omron Automation and SafetyIn Stock: 906Z-01H Datasheet

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Z-01H55

Omron Automation and SafetyIn Stock: 1110Z-01H55 Datasheet

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Z-15E

Omron Automation and SafetyIn Stock: 786Z-15E Datasheet

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Z-15G55

Omron Automation and SafetyIn Stock: 981Z-15G55 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BA-2R is determined by strict alignment of electrical and mechanical parameters. The following criteria establish substitution validity:

Primary Substitution Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Actuator type must be Round Pin Plunger
• Mounting type must be Chassis Mount
• Termination style must be Solder Lug
• AC voltage rating must be 125V minimum
• Mechanical life must support application cycle requirements

Substitution Groups:

Group 1: Full Current Rating Equivalents (20A AC)

• A-20G (Omron): Matches 20A AC rating at 125V. DC rating reduced to 6A. Mechanical life 1,000,000 cycles. Operating temperature -25°C to 80°C.

Group 2: Reduced Current Rating Alternatives (15A AC)

• Z-15E (Omron): 15A AC/DC at 125V. Mechanical life 300,000 cycles. Operating temperature -25°C to 80°C.
• Z-15G55 (Omron): 15A AC at 125V with IP62 ingress protection. Mechanical life 20,000,000 cycles. Operating temperature -15°C to 80°C.

Group 3: Low Current Alternatives (100mA AC/DC)

• Z-01H (Omron): 100mA AC/DC at 125V. Mechanical life 20,000,000 cycles. Operating temperature -25°C to 80°C.
• Z-01H55 (Omron): 100mA AC/DC at 125V with IP62 ingress protection. Mechanical life 20,000,000 cycles. Operating temperature -15°C to 80°C.

Parameter Comparison

Engineering Selection Recommendations

For Direct Current Rating Replacement (20A AC):

The Omron A-20G provides the closest electrical match to the BA-2R with identical 20A AC and 125V AC ratings. Both components feature round pin plunger actuators, chassis mount configuration, and solder lug termination. The A-20G is classified as Active product status with ROHS3 compliance and REACH affected designation. However, the A-20G exhibits reduced mechanical life (1,000,000 cycles versus 20,000,000 cycles) and narrower operating temperature range (-25°C to 80°C versus -55°C to 85°C). DC voltage rating is limited to 30V compared to the BA-2R's 125V DC specification.

For Reduced Current Applications (15A AC):

The Omron Z-15G55 maintains 15A AC rating at 125V with mechanical life of 20,000,000 cycles, matching the BA-2R's cycle endurance. This component includes IP62 ingress protection and ROHS3 compliance. Operating temperature range is -15°C to 80°C. The Z-15E alternative provides 15A AC/DC rating but with significantly reduced mechanical life (300,000 cycles) and no ingress protection specification.

For Low Current Signal Applications (100mA AC/DC):

The Omron Z-01H and Z-01H55 are suitable for applications requiring only 100mA current handling. Both maintain 20,000,000 mechanical cycles and 125V AC rating. The Z-01H55 variant includes IP62 ingress protection. Operating temperature range is -25°C to 80°C for Z-01H and -15°C to 80°C for Z-01H55.

Compliance Considerations:

All substitute parts maintain RoHS compliance. The A-20G and Z-15G55 are ROHS3 compliant with REACH affected status. Selection should account for application-specific environmental and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the Omron A-20G directly replace the BA-2R in all applications?

A: The A-20G matches the BA-2R's 20A AC and 125V AC ratings with identical mechanical configuration. However, three factors require evaluation: (1) Mechanical life is reduced from 20,000,000 to 1,000,000 cycles; (2) Operating temperature range narrows from -55°C to 85°C to -25°C to 80°C; (3) DC voltage rating drops from 125V to 30V. Substitution is valid only when application cycle count, temperature extremes, and DC voltage requirements fall within the A-20G's specifications.

Q: What is the difference between Z-15E and Z-15G55?

A: Both are Omron 15A AC switches at 125V with round pin plunger actuators and chassis mount configuration. Key differences: Z-15E has 300,000 mechanical cycles and IP00 ingress protection; Z-15G55 has 20,000,000 mechanical cycles and IP62 ingress protection. Z-15G55 is ROHS3 compliant with REACH affected status, while Z-15E is RoHS compliant. Z-15G55 is suitable for applications requiring extended cycle life and environmental sealing.

Q: Are the Z-01H and Z-01H55 suitable for the BA-2R application?

A: These components are suitable only for applications where current requirements do not exceed 100mA AC/DC. Both maintain 20,000,000 mechanical cycles and 125V AC rating. The Z-01H55 includes IP62 ingress protection. These parts are not suitable for applications requiring 20A AC current handling.

Q: What does IP62 ingress protection mean for switch selection?

A: IP62 rating indicates protection against limited dust ingress and water spray from any direction. The Z-01H55 and Z-15G55 include this protection; the BA-2R, A-20G, Z-01H, and Z-15E do not have specified ingress protection. Selection of IP62-rated variants is necessary for applications exposed to moisture or particulate contamination.

Q: How do operating temperature ranges affect substitution?

A: The BA-2R operates from -55°C to 85°C. All Omron substitutes have narrower ranges: A-20G, Z-01H, and Z-15E operate -25°C to 80°C; Z-01H55 and Z-15G55 operate -15°C to 80°C. Substitution is valid only when application temperature extremes remain within the substitute part's specified range.

Q: What is the significance of mechanical life ratings in this comparison?

A: Mechanical life indicates the number of actuations before performance degradation. The BA-2R and Z-15G55, Z-01H, Z-01H55 all specify 20,000,000 cycles. The A-20G specifies 1,000,000 cycles; Z-15E specifies 300,000 cycles. Applications requiring high-cycle operation must use parts with matching or higher mechanical life ratings.

Q: Are all substitute parts available in the same packaging?

A: The BA-2R packaging is listed as "-" (not specified). All Omron substitutes are available in Bulk packaging. Packaging compatibility should be confirmed with procurement requirements for your application.