Honeywell BZ-2R-A22 Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell BZ-2R-A22 is a snap action switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 15A AC at 125V. This component features a round pin plunger actuator, chassis mount design, and screw terminal termination. The part is classified as obsolete, making equivalent substitute parts necessary for ongoing applications and new designs requiring functionally compatible alternatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	BZ-2R-A22
Manufacturer	Honeywell Sensing and Productivity Solutions
Circuit Configuration	SPDT
Switch Function	On-Mom (Momentary)
Current Rating (AC)	15A
Current Rating (DC)	500mA
Voltage Rating (AC)	125V
Voltage Rating (DC)	125V
Actuator Type	Round (Pin Plunger)
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Operating Force	255–368 gf
Release Force	113 gf
Operating Position	0.625" (15.9 mm)
Operating Temperature Range	−55°C to +85°C
Mechanical Life	20,000,000 cycles
RoHS Status	RoHS Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the BZ-2R-A22 is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration (SPDT required)
Switch function (On-Mom momentary operation)
AC voltage rating (125V minimum)
AC current rating (15A minimum for direct replacement)
Actuator type (Round pin plunger)
Mounting type (Chassis mount)
Termination style (Screw terminal)

Secondary Compatibility Factors:

Operating position and travel characteristics (pretravel, differential travel, overtravel)
Operating force and release force ranges
Mechanical life rating (20,000,000 cycles minimum)
Operating temperature range (must encompass application requirements)

The substitute parts listed below meet the primary compatibility criteria. Variations in operating force, operating position, and temperature range are noted in the parameter comparison table and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	BZ-2R-A22 (Main)	A-20GD-B7-K	Z-15G-B	Z-15GD-B7-K	Z-15GD55-B7-K	Z-15GS55-B7-K	Z-15H2-B
Manufacturer	Honeywell	Omron	Omron	Omron	Omron	Omron	Omron
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom	On-Mom
Current Rating (AC)	15A	20A	15A	15A	15A	15A	10A
Current Rating (DC)	500mA	6A	6A	6A	6A	6A	2A
Voltage Rating (AC)	125V	125V	125V	125V	125V	125V	125V
Voltage Rating (DC)	125V	30V	30V	30V	30V	30V	30V
Actuator Type	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal	Screw Terminal
Operating Force (gf)	255–368	400–625	250–350	250–350	540	250–350	200–255
Release Force (gf)	113	285	114	114	114	114	114
Operating Position (inches / mm)	0.625" / 15.9 mm	1.030" / 26.2 mm	0.625" / 15.9 mm	0.846" / 21.5 mm	0.846" / 21.5 mm	1.110" / 28.2 mm	0.625" / 15.9 mm
Pretravel (inches / mm)	0.015" / 0.4 mm	0.051" / 1.3 mm	0.015" / 0.4 mm	0.015" / 0.4 mm	0.071" / 1.8 mm	0.015" / 0.4 mm	0.012" / 0.3 mm
Differential Travel (inches / mm)	0.002" / 0.05 mm	0.008" / 0.2 mm	0.002" / 0.05 mm	0.002" / 0.05 mm	0.002" / 0.05 mm	0.002" / 0.05 mm	0.0003" / 0.008 mm
Overtravel (inches / mm)	0.005" / 0.13 mm	0.118" / 3.0 mm	0.005" / 0.13 mm	0.062" / 1.6 mm	0.062" / 1.6 mm	0.062" / 1.6 mm	0.005" / 0.13 mm
Operating Temperature Range	−55°C to +85°C	−25°C to +80°C	−25°C to +80°C	−25°C to +80°C	−15°C to +80°C	−15°C to +80°C	−25°C to +80°C
Electrical Life	Not specified	500,000 cycles	500,000 cycles	500,000 cycles	500,000 cycles	500,000 cycles	500,000 cycles
Mechanical Life	20,000,000 cycles	1,000,000 cycles	20,000,000 cycles	20,000,000 cycles	20,000,000 cycles	20,000,000 cycles	20,000,000 cycles
Ingress Protection	Not specified	IP00	IP00	IP00	IP62	IP62	IP00
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Replacement Candidates (Highest Compatibility):

The Omron Z-15G-B and Z-15GD-B7-K parts provide the closest functional equivalence to the BZ-2R-A22. Both maintain the 15A AC current rating, 125V AC voltage rating, identical operating position (0.625" / 15.9 mm), and matching mechanical life specification (20,000,000 cycles). These parts are classified as active products with current manufacturing support.

The Z-15G-B is available in tray packaging and offers ROHS3 compliance. The Z-15GD-B7-K is supplied in bulk packaging and also provides ROHS3 compliance. Both parts feature operating force ranges (250–350 gf) that overlap with the BZ-2R-A22 specification (255–368 gf).

Alternative Candidates (Functional Equivalence with Parameter Variations):

The Omron Z-15GD55-B7-K and Z-15GS55-B7-K provide enhanced ingress protection (IP62 rating) compared to the BZ-2R-A22. Both maintain 15A AC current rating and 125V AC voltage rating. The Z-15GD55-B7-K features a fixed operating force of 540 gf and operating position of 0.846" (21.5 mm). The Z-15GS55-B7-K maintains the standard operating force range (250–350 gf) with an extended operating position of 1.110" (28.2 mm). These variants are suitable for applications requiring sealed operation or different actuation travel characteristics.

Limited Compatibility Candidate:

The Omron A-20GD-B7-K provides higher current capacity (20A AC) and is suitable for applications where increased current headroom is required. However, this part exhibits significantly different mechanical characteristics, including higher operating force (400–625 gf), extended operating position (1.030" / 26.2 mm), and reduced mechanical life (1,000,000 cycles). This part is not recommended as a direct replacement but may serve applications with different mechanical requirements.

Not Recommended:

The Omron Z-15H2-B is rated for 10A AC, which is below the 15A AC requirement of the BZ-2R-A22. This part is not suitable for applications requiring the full 15A capacity.

Compliance and Availability:

All substitute parts are RoHS compliant and manufactured by Omron Automation and Safety, an active supplier with established distribution channels. The Z-15G-B, Z-15GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K are all classified as active products with current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the Omron Z-15G-B directly replace the Honeywell BZ-2R-A22?

A: The Z-15G-B meets all primary compatibility criteria: SPDT circuit, On-Mom function, 15A AC rating, 125V AC rating, round pin plunger actuator, chassis mount, and screw terminal termination. Operating position, pretravel, differential travel, and overtravel specifications are identical. Operating force range (250–350 gf) overlaps with the BZ-2R-A22 (255–368 gf). Mechanical life rating matches at 20,000,000 cycles. The Z-15G-B is suitable for direct replacement in applications operating within the −25°C to +80°C temperature range.

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

A: Both parts maintain identical electrical ratings (15A AC, 125V AC) and mechanical life (20,000,000 cycles). The primary differences are: (1) Ingress Protection rating—Z-15GD-B7-K is IP00 (open), while Z-15GD55-B7-K is IP62 (sealed); (2) Operating force—Z-15GD-B7-K ranges 250–350 gf, while Z-15GD55-B7-K is fixed at 540 gf; (3) Operating temperature range—Z-15GD-B7-K operates −25°C to +80°C, while Z-15GD55-B7-K operates −15°C to +80°C. Select Z-15GD55-B7-K for sealed applications or where higher operating force is required.

Q: Why does the A-20GD-B7-K have lower mechanical life than other substitutes?

A: The A-20GD-B7-K is rated for 20A AC current, which is higher than the BZ-2R-A22 (15A AC). The mechanical life specification of 1,000,000 cycles reflects the design characteristics of this higher-capacity component. This part is not recommended as a direct replacement unless the application specifically requires the increased current capacity.

Q: What packaging options are available for substitute parts?

A: The Z-15G-B is supplied in tray packaging. The A-20GD-B7-K, Z-15GD-B7-K, Z-15GD55-B7-K, Z-15GS55-B7-K, and Z-15H2-B are supplied in bulk packaging. Packaging selection should be based on procurement and inventory management requirements.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are RoHS compliant. The Z-15G-B, Z-15GD-B7-K, and Z-15H2-B carry ROHS3 certification. The A-20GD-B7-K, Z-15GD55-B7-K, and Z-15GS55-B7-K carry RoHS certification. Both certifications satisfy RoHS directive requirements.

Q: How do operating force differences affect component selection?

A: Operating force determines the actuation effort required to trigger the switch. The BZ-2R-A22 requires 255–368 gf. The Z-15G-B, Z-15GD-B7-K, and Z-15GS55-B7-K maintain similar ranges (250–350 gf), ensuring comparable actuation feel. The Z-15GD55-B7-K requires 540 gf, representing significantly higher actuation effort. The Z-15H2-B requires 200–255 gf, representing lower actuation effort. Select based on mechanical design and user interface requirements.

Q: What is the significance of operating position differences?

A: Operating position defines the plunger travel distance required to actuate the switch. The BZ-2R-A22 and Z-15G-B both specify 0.625" (15.9 mm). The Z-15GD-B7-K and Z-15GD55-B7-K specify 0.846" (21.5 mm). The Z-15GS55-B7-K specifies 1.110" (28.2 mm). The A-20GD-B7-K specifies 1.030" (26.2 mm). Longer operating positions require greater mechanical travel in the application design. Verify mechanical clearance and actuation mechanism compatibility before selection.

Q: Can substitute parts operate at the full −55°C to +85°C temperature range of the BZ-2R-A22?

A: No. All substitute parts are rated for narrower temperature ranges: −25°C to +80°C (Z-15G-B, Z-15GD-B7-K, Z-15H2-B, A-20GD-B7-K) or −15°C to +80°C (Z-15GD55-B7-K, Z-15GS55-B7-K). Applications requiring operation below −25°C or above +85°C cannot use these substitutes. Verify application temperature requirements before component selection.

Q: What does IP62 ingress protection mean for Z-15GD55-B7-K and Z-15GS55-B7-K?

A: IP62 rating indicates protection against dust ingress and water spray from any direction. This is suitable for applications exposed to moisture or particulate contamination. The standard IP00 rating of other substitutes provides no ingress protection. Select IP62-rated parts for sealed or harsh environment applications.

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