BZ-2R Equivalent & Substitute Parts Reference

Part Overview

The Honeywell BZ-2R is an SPDT snap action switch rated for 15A at 125V AC with chassis mount configuration and solder lug termination. This switch is designed for applications requiring reliable on-momentary switching action with a round pin plunger actuator. The part is currently active in production with 1067 units in stock inventory.

Equivalent and substitute parts are identified to provide alternative sourcing options when the primary BZ-2R component is unavailable, when procurement lead times require alternatives, or when design flexibility permits component substitution within specified electrical and mechanical parameters.

Key Parameters

Parameter	BZ-2R Specification
Manufacturer	Honeywell Sensing and Productivity Solutions
Series	BZ
Circuit Configuration	SPDT
Switch Function	On-Mom
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	Solder Lug
Operating Force	255 ~ 368gf
Release Force	113gf
Operating Position	0.625" (15.9mm)
Operating Temperature Range	-55°C ~ 85°C
Mechanical Life	20,000,000 Cycles
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-2R is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration (SPDT)
Switch function (On-Mom)
Actuator type (Round pin plunger)
Mounting type (Chassis mount)
Termination style (Solder lug)
Operating position (0.625" / 15.9mm)

Electrical Compatibility Criteria:

AC voltage rating minimum 125V
AC current rating minimum 15A
DC voltage rating minimum 125V
DC current rating minimum 500mA

Mechanical Compatibility Criteria:

Operating force within acceptable range for application
Release force within acceptable range
Mechanical life minimum 20,000,000 cycles
Operating temperature range overlap with application requirements

The substitute parts identified (Z-15G, Z-15G55, Z-15H2) share the same circuit configuration, actuator type, mounting method, and termination style as the BZ-2R. However, electrical and mechanical parameters vary and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	BZ-2R (Honeywell)	Z-15G (Omron)	Z-15G55 (Omron)	Z-15H2 (Omron)
Circuit	SPDT	SPDT	SPDT	SPDT
Switch Function	On-Mom	On-Mom	On-Mom	On-Mom
Current Rating (AC)	15A	15A	15A	10A
Current Rating (DC)	500mA	6A	6A	2A
Voltage Rating (AC)	125V	125V	125V	125V
Voltage Rating (DC)	125V	30V	30V	30V
Actuator Type	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug
Operating Force	255 ~ 368gf	250 ~ 350gf	430gf	200 ~ 255gf
Release Force	113gf	114gf	114gf	114gf
Operating Position	0.625" (15.9mm)	0.625" (15.9mm)	0.625" (15.9mm)	0.625" (15.9mm)
Pretravel	0.015" (0.4mm)	0.015" (0.4mm)	0.087" (2.2mm)	0.012" (0.3mm)
Differential Travel	0.002" (0.05mm)	0.002" (0.05mm)	0.002" (0.05mm)	0.0003" (0.008mm)
Overtravel	0.005" (0.13mm)	0.005" (0.13mm)	0.005" (0.13mm)	0.005" (0.13mm)
Operating Temperature	-55°C ~ 85°C	-25°C ~ 80°C	-15°C ~ 80°C	-25°C ~ 80°C
Mechanical Life	20,000,000 Cycles	20,000,000 Cycles	20,000,000 Cycles	20,000,000 Cycles
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

Z-15G (Omron Automation and Safety)

The Z-15G is suitable for applications where the BZ-2R is unavailable and the following conditions are met: AC current requirements do not exceed 15A, DC current requirements do not exceed 6A, DC voltage does not exceed 30V, and operating temperature range is within -25°C to 80°C. The Z-15G maintains identical operating position, pretravel, and differential travel specifications. Operating force range (250 ~ 350gf) overlaps with the BZ-2R specification. This part is ROHS3 compliant and carries REACH Unaffected status. Packaging is supplied in trays.

Z-15G55 (Omron Automation and Safety)

The Z-15G55 is suitable for applications requiring enhanced ingress protection (IP62 rating) where the BZ-2R is unavailable and the following conditions are met: AC current requirements do not exceed 15A, DC current requirements do not exceed 6A, DC voltage does not exceed 30V, and operating temperature range is within -15°C to 80°C. The Z-15G55 exhibits higher operating force (430gf) compared to the BZ-2R and increased pretravel (0.087" / 2.2mm). This part is ROHS3 compliant and carries REACH Affected status. Packaging is supplied in bulk.

Z-15H2 (Omron Automation and Safety)

The Z-15H2 is not suitable as a direct substitute for the BZ-2R due to reduced AC current rating (10A versus 15A). This part is applicable only in applications where AC current requirements do not exceed 10A and DC current requirements do not exceed 2A. DC voltage is limited to 30V. Operating temperature range is -25°C to 80°C. Operating force range (200 ~ 255gf) is lower than the BZ-2R. This part is ROHS3 compliant and carries REACH Affected status. Packaging is supplied in bulk.

All substitute parts maintain active product status and 20,000,000 cycle mechanical life equivalent to the BZ-2R.

Frequently Asked Questions (FAQ)

Q: Can the Z-15G replace the BZ-2R in all applications?

A: The Z-15G is compatible with applications where DC voltage does not exceed 30V and operating temperature remains within -25°C to 80°C. If the application requires DC voltage above 30V or operates below -25°C, the Z-15G is not suitable. AC current and voltage ratings are compatible at 15A and 125V respectively.

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

A: The Z-15G55 provides IP62 ingress protection compared to IP00 for the Z-15G. The Z-15G55 has higher operating force (430gf fixed) and increased pretravel (0.087" versus 0.015"). The Z-15G55 is supplied in bulk packaging while Z-15G is supplied in trays. Both have identical AC/DC current and voltage ratings.

Q: Why is the Z-15H2 listed as a substitute if it has lower current rating?

A: The Z-15H2 is listed as a substitute only for applications where AC current requirements do not exceed 10A. It is not a universal substitute for the BZ-2R. Applications requiring the full 15A AC rating must use the BZ-2R, Z-15G, or Z-15G55.

Q: Are all substitute parts RoHS compliant?

A: Yes. The BZ-2R is RoHS Compliant. All substitute parts (Z-15G, Z-15G55, Z-15H2) are ROHS3 Compliant, which represents a more recent RoHS standard revision.

Q: What is the impact of different operating force specifications?

A: Operating force determines the actuator pressure required to trigger the switch. The BZ-2R requires 255 ~ 368gf. The Z-15G requires 250 ~ 350gf (compatible range). The Z-15G55 requires 430gf (higher force). The Z-15H2 requires 200 ~ 255gf (lower force). Applications with specific actuator force requirements must select parts with compatible operating force ranges.

Q: Can these parts be used interchangeably in existing designs?

A: Interchangeability depends on application-specific electrical and mechanical requirements. All parts share identical circuit configuration, actuator type, mounting method, and termination style. However, differences in current ratings, voltage ratings, operating temperature ranges, operating force, and pretravel must be evaluated against design specifications before substitution.

Q: What packaging options are available?

A: The BZ-2R is supplied with unspecified packaging. The Z-15G is supplied in trays. The Z-15G55 and Z-15H2 are supplied in bulk packaging. Packaging selection may impact procurement quantities and handling procedures.

Q: Are there REACH compliance considerations?

A: The Z-15G carries REACH Unaffected status. The Z-15G55 and Z-15H2 carry REACH Affected status. Applications subject to REACH regulations must account for these designations during component selection.

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