BZ-RX9 Equivalent & Substitute Parts Reference

Part Overview

The BZ-RX9 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis mount switch is rated for 15A AC at 125V and features a round pin plunger actuator with solder lug termination. The product is currently obsolete, making equivalent substitutes necessary for ongoing applications and maintenance requirements. The BZ-RX9 incorporates a reset plunger on the bottom and operates across a temperature range of -55°C to 85°C with 20,000,000 mechanical life cycles.

Key Parameters

Parameter	BZ-RX9 Specification
Manufacturer	Honeywell Sensing and Productivity Solutions
Circuit Configuration	SPDT (Single Pole Double Throw)
Switch Function	On-On
Current Rating (AC)	15A at 125V
Current Rating (DC)	500mA at 125V
Actuator Type	Round Pin Plunger
Mounting Type	Chassis Mount
Termination Style	Solder Lug
Operating Force	198–255 gf
Operating Position	0.625" (15.9 mm)
Pretravel	0.015" (0.4 mm)
Overtravel	0.005" (0.13 mm)
Operating Temperature	-55°C to 85°C
Mechanical Life	20,000,000 Cycles
Product Status	Obsolete
RoHS Status	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZ-RX9 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Circuit configuration: SPDT only
Actuator type: Round pin plunger
Mounting type: Chassis mount
Termination style: Solder lug
AC voltage rating: 125V minimum
Operating position: 0.625" (15.9 mm)
Pretravel: 0.015" (0.4 mm)
Overtravel: 0.005" (0.13 mm)
Switch function: On-On configuration with reset plunger on bottom

Current Rating Considerations: The BZ-RX9 is rated for 15A AC and 500mA DC. Substitute parts must maintain or exceed the 15A AC rating at 125V to ensure electrical compatibility in the original application circuit.

Mechanical Life: The BZ-RX9 provides 20,000,000 mechanical cycles. Substitutes with equivalent or superior mechanical life ratings are preferred for equivalent performance longevity.

Temperature Range: The BZ-RX9 operates from -55°C to 85°C. Substitute parts with narrower temperature ranges may limit application scope but remain functionally compatible if the operating environment falls within the substitute's specified range.

The following Omron Automation and Safety parts meet these substitution criteria: Z-15H2, Z-01H55, A-20G, Z-15ER, and Z-15E.

Parameter Comparison

Parameter	BZ-RX9	Z-15H2	Z-01H55	A-20G	Z-15ER	Z-15E
Manufacturer	Honeywell	Omron	Omron	Omron	Omron	Omron
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	On-On	On-Mom	On-Mom	On-Mom	On-On	On-Mom
Current Rating AC	15A @ 125V	10A @ 125V	100mA @ 125V	20A @ 125V	15A @ 125V	15A @ 125V
Current Rating DC	500mA @ 125V	2A @ 30V	100mA @ 30V	6A @ 30V	15A @ 30V	15A @ 30V
Actuator Type	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
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug
Operating Force	198–255 gf	200–255 gf	350 gf	400–625 gf	200–255 gf	625–800 gf
Operating Position	0.625" (15.9 mm)	0.625" (15.9 mm)	0.625" (15.9 mm)	0.640" (16.3 mm)	0.625" (15.9 mm)	0.625" (15.9 mm)
Pretravel	0.015" (0.4 mm)	0.012" (0.3 mm)	0.087" (2.2 mm)	0.051" (1.3 mm)	0.015" (0.4 mm)	0.030" (0.8 mm)
Overtravel	0.005" (0.13 mm)	0.005" (0.13 mm)	0.005" (0.13 mm)	0.010" (0.25 mm)	0.005" (0.13 mm)	0.005" (0.13 mm)
Operating Temperature	-55°C to 85°C	-25°C to 80°C	-15°C to 80°C	-25°C to 80°C	-25°C to 80°C	-25°C to 80°C
Mechanical Life	20,000,000	20,000,000	20,000,000	1,000,000	300,000	300,000
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute: Z-15ER

The Z-15ER is the closest functional equivalent to the BZ-RX9. Both parts feature On-On switch function with reset plunger on bottom, identical operating position (0.625"), matching pretravel (0.015"), and equivalent overtravel (0.005"). The Z-15ER maintains 15A AC at 125V rating and is rated for 15A DC at 30V. Operating force range (200–255 gf) aligns with the BZ-RX9 specification. The Z-15ER is RoHS Compliant and carries MSL 1 rating. Product status is Active with 1,171 units in stock. Temperature range is -25°C to 80°C, which is narrower than the BZ-RX9 but suitable for most industrial applications.

Secondary Substitute: Z-15H2

The Z-15H2 provides excellent mechanical compatibility with 20,000,000 mechanical life cycles matching the BZ-RX9. Operating position, pretravel, and overtravel specifications are identical. Operating force (200–255 gf) aligns precisely with the BZ-RX9. Current rating is 10A AC at 125V, which is lower than the BZ-RX9's 15A rating. The Z-15H2 is suitable for applications where 10A AC capacity is sufficient. Product status is Active with ROHS3 Compliance and 1,082 units in stock.

Tertiary Substitute: A-20G

The A-20G provides the highest current capacity at 20A AC at 125V, exceeding the BZ-RX9 requirement. Operating position is 0.640" (16.3 mm), which deviates slightly from the BZ-RX9's 0.625" specification. Pretravel (0.051") and overtravel (0.010") differ from the BZ-RX9. Switch function is On-Mom rather than On-On. The A-20G is suitable for applications requiring higher current capacity where mechanical tolerance variations are acceptable. Product status is Active with ROHS3 Compliance and 809 units in stock.

Not Recommended for Direct Substitution:

Z-01H55 and Z-01H are rated for only 100mA AC/DC, which is insufficient for the BZ-RX9's 15A AC application. These parts are suitable only for low-current signal switching applications.

Z-15E is rated for 15A AC but features On-Mom function instead of On-On, and mechanical life is only 300,000 cycles compared to the BZ-RX9's 20,000,000 cycles.

Frequently Asked Questions (FAQ)

Q: Can the Z-15ER directly replace the BZ-RX9 in my application?

A: The Z-15ER is functionally compatible with the BZ-RX9 for most applications. Both parts share identical circuit configuration (SPDT), switch function (On-On with reset plunger), operating position (0.625"), pretravel (0.015"), and overtravel (0.005"). Current rating is equivalent at 15A AC at 125V. The primary difference is operating temperature range: Z-15ER operates -25°C to 80°C versus BZ-RX9's -55°C to 85°C. Verify your application's temperature requirements before selection.

Q: Why does the A-20G have a different operating position than the BZ-RX9?

A: The A-20G operating position is 0.640" (16.3 mm) compared to the BZ-RX9's 0.625" (15.9 mm). This 0.015" difference reflects different mechanical design between manufacturers. Verify that your mechanical mounting and actuator clearances accommodate this variation before substitution.

Q: What is the difference between On-On and On-Mom switch functions?

A: On-On switches maintain their position after actuation and remain in the selected state until manually switched again. On-Mom (momentary) switches return to their default position when the actuator is released. The BZ-RX9 is On-On with reset plunger on bottom. Most substitute parts are On-Mom, which changes application behavior. The Z-15ER is the only substitute offering On-On function.

Q: Can I use the Z-15H2 if my application requires 15A AC?

A: No. The Z-15H2 is rated for 10A AC at 125V, which is below the BZ-RX9's 15A AC requirement. Using an undersized component creates electrical overstress and fire hazard. Select Z-15ER or A-20G for 15A AC applications.

Q: What does RoHS Compliant and ROHS3 Compliant mean for substitution?

A: Both RoHS Compliant and ROHS3 Compliant indicate the part meets lead-free and hazardous substance restrictions. ROHS3 represents the current standard. Both certifications are compatible for substitution purposes. Verify your procurement requirements specify which standard is required.

Q: Are all substitute parts available in the same packaging as the BZ-RX9?

A: No. The BZ-RX9 packaging is listed as "-" (not specified). Substitute parts are available in Bulk or Tray packaging. Verify packaging requirements with your procurement department, as packaging affects handling, storage, and component count per order.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life with no moisture sensitivity precautions required. All listed parts carry MSL 1 rating, ensuring compatibility with standard storage and handling procedures.

Q: Can I substitute based on current rating alone?

A: No. Current rating is one of multiple critical parameters. Substitution requires alignment of circuit configuration, switch function, actuator type, mounting type, termination style, operating position, pretravel, overtravel, and voltage rating. Verify all parameters before selection.

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