BZ-RX43 Equivalent & Substitute Parts Reference

Part Overview

The BZ-RX43 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with screw terminal connections. This component operates at 15A AC / 500mA DC with 125V AC/DC ratings and features a round pin plunger actuator with reset plunger on bottom. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where functional compatibility is required.

Key Parameters

Parameter	BZ-RX43 Value
Circuit Configuration	SPDT
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	198 ~ 255gf
Operating Position	0.625" (15.9mm)
Pretravel	0.012" (0.3mm)
Overtravel	0.005" (0.13mm)
Operating Temperature Range	-55°C ~ 85°C
Mechanical Life	20,000,000 Cycles
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-RX43 is determined by the following critical parameters:

Primary Compatibility Criteria:

Circuit configuration must be SPDT
Actuator type must be Round (Pin Plunger)
Mounting type must be Chassis Mount
Termination style must be Screw Terminal
AC voltage rating must be 125V minimum
AC current rating must be 15A minimum

Secondary Compatibility Considerations:

Operating position tolerance (0.625" ± acceptable variance)
Pretravel and overtravel characteristics
Operating temperature range (minimum -55°C required for full BZ-RX43 replacement)
Mechanical life cycle rating (20,000,000 cycles minimum preferred)

The substitute parts listed below meet the primary compatibility criteria. Variations in secondary parameters indicate application-specific suitability and must be evaluated against system requirements.

Parameter Comparison

Parameter	BZ-RX43	A-20GD-B7-K	Z-15GD-B7-K	Z-15GD55-B7-K	Z-15GS55-B7-K	Z-15H2-B
Manufacturer	Honeywell	Omron	Omron	Omron	Omron	Omron
Circuit	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Current Rating (AC)	15A	20A	15A	15A	15A	10A
Current Rating (DC)	500mA	6A	6A	6A	6A	2A
Voltage Rating (AC)	125V	125V	125V	125V	125V	125V
Voltage Rating (DC)	125V	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)
Mounting Type	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
Operating Force	198 ~ 255gf	400 ~ 625gf	250 ~ 350gf	540gf	250 ~ 350gf	200 ~ 255gf
Operating Position	0.625" (15.9mm)	1.030" (26.2mm)	0.846" (21.5mm)	0.846" (21.5mm)	1.110" (28.2mm)	0.625" (15.9mm)
Pretravel	0.012" (0.3mm)	0.051" (1.3mm)	0.015" (0.4mm)	0.071" (1.8mm)	0.015" (0.4mm)	0.012" (0.3mm)
Overtravel	0.005" (0.13mm)	0.118" (3.0mm)	0.062" (1.6mm)	0.062" (1.6mm)	0.062" (1.6mm)	0.005" (0.13mm)
Operating Temperature Range	-55°C ~ 85°C	-25°C ~ 80°C	-25°C ~ 80°C	-15°C ~ 80°C	-15°C ~ 80°C	-25°C ~ 80°C
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
Ingress Protection	Not specified	IP00	IP00	IP62	IP62	IP00
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS Compliant	RoHS Compliant	ROHS3 Compliant	RoHS Compliant	RoHS Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Functional Equivalents (Preferred for Direct Replacement):

Z-15GD-B7-K and Z-15H2-B are the closest functional equivalents to the BZ-RX43. Both are manufactured by Omron Automation and Safety with active product status. Z-15GD-B7-K matches the 15A AC current rating and maintains identical operating position (0.625" / 15.9mm), pretravel (0.012" / 0.3mm), and overtravel (0.005" / 0.13mm) characteristics. Z-15H2-B provides identical mechanical specifications but operates at 10A AC, suitable for applications with lower current requirements. Both parts are ROHS3 compliant and support 20,000,000 mechanical life cycles.

Alternative Substitutes (Application-Dependent):

Z-15GD55-B7-K and Z-15GS55-B7-K provide enhanced ingress protection (IP62) compared to the BZ-RX43, making them suitable for environments requiring sealed operation. Both maintain 15A AC rating and 20,000,000 cycle mechanical life. Operating position differs (0.846" / 21.5mm and 1.110" / 28.2mm respectively), requiring mechanical clearance verification.

A-20GD-B7-K offers increased current capacity (20A AC) but exhibits significantly different mechanical characteristics: larger operating position (1.030" / 26.2mm), higher operating force (400 ~ 625gf), and reduced mechanical life (1,000,000 cycles). This part is suitable only for applications where higher current capacity is required and mechanical envelope changes are acceptable.

Temperature Range Consideration:

The BZ-RX43 operates across -55°C to 85°C. All Omron substitutes operate within -25°C to -15°C minimum, which may not satisfy applications requiring full -55°C low-temperature performance. System thermal requirements must be evaluated against substitute temperature specifications.

DC Voltage Rating Limitation:

All substitute parts are rated for 30V DC maximum, compared to the BZ-RX43's 125V DC rating. Applications requiring 125V DC operation cannot use these substitutes.

Frequently Asked Questions (FAQ)

Q: Can Z-15H2-B replace BZ-RX43 in all applications?

A: Z-15H2-B is suitable for applications operating at 10A AC or lower. The 15A AC BZ-RX43 applications require either Z-15GD-B7-K (15A AC equivalent) or A-20GD-B7-K (20A AC, higher capacity). Mechanical specifications (operating position, pretravel, overtravel) are identical between Z-15H2-B and BZ-RX43, supporting direct mechanical substitution for current-compatible applications.

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

A: Both parts share identical electrical ratings (15A AC, 6A DC, 125V AC, 30V DC) and mechanical life (20,000,000 cycles). Z-15GD55-B7-K provides IP62 ingress protection versus IP00 for Z-15GD-B7-K, making it suitable for sealed or moisture-exposed environments. Operating force differs (250 ~ 350gf versus 540gf fixed), and operating temperature minimum is -15°C versus -25°C. Z-15GD55-B7-K requires higher actuation force.

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

A: A-20GD-B7-K is rated for 1,000,000 mechanical cycles compared to 20,000,000 cycles for Z-series parts. This reflects different design specifications for the higher 20A AC current rating. Applications requiring extended cycle life should use Z-series alternatives at 15A AC or lower.

Q: Are all substitutes RoHS compliant?

A: Yes. BZ-RX43 is RoHS Compliant. Z-15GD-B7-K and Z-15H2-B are ROHS3 Compliant. Z-15GD55-B7-K, Z-15GS55-B7-K, and A-20GD-B7-K are RoHS Compliant. All parts meet RoHS requirements for new designs.

Q: Can substitutes operate at 125V DC like the BZ-RX43?

A: No. All listed substitutes are rated for 30V DC maximum. The BZ-RX43's 125V DC rating is not matched by any substitute. Applications requiring 125V DC operation cannot use these parts and require alternative component sourcing.

Q: What is the impact of different operating positions on mechanical installation?

A: Operating position determines actuator travel distance. BZ-RX43 and Z-15H2-B both operate at 0.625" (15.9mm). Z-15GD-B7-K operates at 0.846" (21.5mm), Z-15GD55-B7-K at 0.846" (21.5mm), and Z-15GS55-B7-K at 1.110" (28.2mm). Larger operating positions require greater mechanical clearance in the application enclosure. Mechanical envelope verification is required before substitution.

Q: Which substitute is best for low-temperature applications below -25°C?

A: None of the listed substitutes operate below -25°C. The BZ-RX43 operates to -55°C. Applications requiring operation below -25°C cannot use these Omron substitutes and require alternative component selection or thermal management solutions.

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