Honeywell BZ-R31 Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell BZ-R31 is an SPDT snap action switch rated for 15A AC at 125V with a round pin plunger actuator and chassis mount configuration. This switch is designed for applications requiring reliable on-momentary switching with high mechanical cycle life. The part is currently active in production with 1120 units in stock and carries RoHS compliance certification.

Substitute parts are identified to address application requirements including higher current ratings, enhanced ingress protection, or alternative mechanical characteristics while maintaining core electrical compatibility within the SPDT 125V AC circuit topology.

Substiute Parts

BZ-R31

Honeywell Sensing and Productivity SolutionsIn Stock: 1154BZ-R31 Datasheet

Current PartRFQ

A-20GD-B7-K

Omron Automation and SafetyIn Stock: 1168A-20GD-B7-K Datasheet

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Z-15GD-B7-K

Omron Automation and SafetyIn Stock: 951Z-15GD-B7-K Datasheet

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Z-15GD55-B7-K

Omron Automation and SafetyIn Stock: 1065Z-15GD55-B7-K Datasheet

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Z-15GS55-B7-K

Omron Automation and SafetyIn Stock: 902Z-15GS55-B7-K Datasheet

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Z-15H2-B

Omron Automation and SafetyIn Stock: 1146Z-15H2-B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-R31 is determined by the following mandatory parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPDT only
• Switch function: On-Momentary operation
• Voltage rating: 125V AC minimum
• Actuator type: Round pin plunger
• Mounting type: Chassis mount
• Termination style: Screw terminal

Secondary Compatibility Parameters:

• Current rating: 15A AC or higher (BZ-R31 baseline is 15A AC)
• Mechanical life: 20,000,000 cycles or higher
• Operating temperature: Must encompass application requirements
• RoHS compliance: Required for regulated applications

The identified substitute parts (A-20GD-B7-K, Z-15GD-B7-K, Z-15GD55-B7-K, Z-15GS55-B7-K, Z-15H2-B) all maintain SPDT configuration, on-momentary function, 125V AC rating, round pin plunger actuation, chassis mount, and screw terminal termination. Variations exist in current capacity, ingress protection rating, operating force characteristics, and mechanical/electrical life specifications.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (Matched Current Rating):

The Z-15GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K are functionally equivalent to the BZ-R31 at the 15A AC / 125V AC specification level. All three maintain identical current ratings, voltage ratings, circuit configuration, and mechanical life (20,000,000 cycles). Selection among these three depends on environmental requirements:

• Z-15GD-B7-K: Standard ingress protection (IP00), suitable for controlled indoor environments
• Z-15GD55-B7-K and Z-15GS55-B7-K: Enhanced ingress protection (IP62), suitable for applications with moisture or dust exposure

Higher Current Capacity Alternative:

The A-20GD-B7-K provides 20A AC capacity at 125V, exceeding the BZ-R31 baseline. This part is suitable for applications requiring current headroom above 15A. Note that mechanical life is reduced to 1,000,000 cycles compared to the BZ-R31's 20,000,000 cycles.

Lower Current Alternative:

The Z-15H2-B is rated for 10A AC at 125V. This part is suitable only for applications with maximum current requirements below 10A and should not be used as a substitute where 15A capacity is required.

Temperature Considerations:

The BZ-R31 operates across -55°C to +85°C. All Omron substitutes operate within -25°C to -15°C minimum and +80°C maximum. Applications requiring operation below -25°C require the BZ-R31 or equivalent Honeywell products.

Compliance Status:

All identified parts carry RoHS compliance certification. The Z-15GD-B7-K and Z-15H2-B carry ROHS3 designation. The Z-15GD55-B7-K and Z-15GS55-B7-K carry standard RoHS Compliant status. The Z-15GD-B7-K and Z-15H2-B are REACH Affected; others are REACH Unaffected or not specified.

Frequently Asked Questions (FAQ)

Q: Can the A-20GD-B7-K replace the BZ-R31 in all applications?

A: The A-20GD-B7-K is electrically compatible for 125V AC SPDT on-momentary switching. However, it has 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). Use only in applications where these reduced specifications are acceptable.

Q: What is the difference between Z-15GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K?

A: All three maintain 15A AC / 125V AC rating and 20,000,000 mechanical life. Differences are: Z-15GD-B7-K has IP00 ingress protection and operating force 250-350gf; Z-15GD55-B7-K has IP62 ingress protection and fixed 540gf operating force; Z-15GS55-B7-K has IP62 ingress protection and operating force 250-350gf. Select based on environmental exposure and actuation force requirements.

Q: Is the Z-15H2-B suitable as a substitute for the BZ-R31?

A: No. The Z-15H2-B is rated for 10A AC maximum, which is below the BZ-R31's 15A AC rating. Use only in applications with confirmed maximum current requirements below 10A.

Q: What does IP62 ingress protection mean?

A: IP62 rating indicates protection against dust ingress and water spray from any direction. This is suitable for applications with moisture or dust exposure. The BZ-R31 and standard Z-15GD-B7-K have no specified ingress protection (equivalent to IP00) and are suitable for dry, controlled environments only.

Q: Can I use these substitutes in DC applications?

A: The BZ-R31 is rated for 500mA DC at 125V. All Omron substitutes are rated for higher DC current (2A to 6A) but at reduced DC voltage (30V maximum). DC application compatibility depends on both current and voltage requirements. Verify that application voltage does not exceed 30V DC for Omron parts.

Q: Are all these parts RoHS compliant?

A: Yes. All identified parts carry RoHS compliance certification. The Z-15GD-B7-K and Z-15H2-B carry ROHS3 designation, indicating compliance with the most recent RoHS directive revision.

Q: What is the difference in operating force between these switches?

A: Operating force determines the physical effort required to actuate the switch. The BZ-R31 requires 624-794gf. Omron substitutes range from 200-255gf (Z-15H2-B) to 540gf (Z-15GD55-B7-K). Lower operating force requires less physical pressure; higher operating force provides greater resistance to accidental actuation. Select based on application ergonomics and environmental vibration conditions.

Q: Do these switches have the same physical dimensions?

A: No. Operating position (plunger travel distance) varies: BZ-R31 and Z-15H2-B are 0.625" (15.9mm); Z-15GD-B7-K and Z-15GD55-B7-K are 0.846" (21.5mm); A-20GD-B7-K is 1.030" (26.2mm); Z-15GS55-B7-K is 1.110" (28.2mm). Verify mechanical clearance in your application before substitution.

Q: What is the inventory status for these parts?

A: Current stock levels are: BZ-R31 (1120 pcs), A-20GD-B7-K (1095 pcs), Z-15GD-B7-K (847 pcs), Z-15GD55-B7-K (961 pcs), Z-15GS55-B7-K (797 pcs), Z-15H2-B (1049 pcs). All parts are listed as new original stock.