BZ-2RD72-A2 Equivalent & Substitute Parts Reference

Part Overview

The BZ-2RD72-A2 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis mount switch is rated for 1A at 125V AC with a round pin plunger actuator and screw terminal connections. The part is currently active in production with 930 units in stock. Equivalent and substitute parts are identified when component availability changes, supply chain disruptions occur, or design flexibility permits alternative configurations within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value
Manufacturer Part Number	BZ-2RD72-A2
Manufacturer	Honeywell Sensing and Productivity Solutions
Series	BZ
Circuit Configuration	SPDT
Switch Function	On-Mom
Current Rating	1A AC
Voltage Rating - AC	125V
Actuator Type	Round (Pin Plunger)
Mounting Type	Chassis Mount
Termination Style	Screw Terminal
Operating Temperature Range	-55°C to 85°C
Mechanical Life	20,000,000 Cycles
RoHS Status	RoHS Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-2RD72-A2 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: Screw Terminal
Voltage rating: 125V AC minimum
Current rating: 1A AC minimum

Identified Substitute Parts:

TZ-1G (Omron Automation and Safety): Meets primary compatibility criteria with SPDT circuit, On-Mom function, round pin plunger actuator, chassis mount, and screw terminal configuration. Rated for 1A AC/DC at 125V AC and 30V DC. Operating temperature range extends to -65°C to 400°C. Mechanical life rated at 100,000 cycles. Packaged in trays with 1,038 units in stock.

Z-01HD55-B (Omron Automation and Safety): Meets primary compatibility criteria with SPDT circuit, On-Mom function, round pin plunger actuator, chassis mount, and screw terminal configuration. Current rating is 100mA AC/DC, which is below the 1A requirement of the main part. Voltage rating is 125V AC and 30V DC. Operating temperature range is -15°C to 80°C. Mechanical life rated at 20,000,000 cycles. Packaged in bulk with 996 units in stock.

Parameter Comparison

Parameter	BZ-2RD72-A2	TZ-1G	Z-01HD55-B
Manufacturer	Honeywell	Omron	Omron
Circuit	SPDT	SPDT	SPDT
Switch Function	On-Mom	On-Mom	On-Mom
Current Rating (AC)	1A	1A	100mA
Voltage Rating - AC	125V	125V	125V
Voltage Rating - DC	Not specified	30V	30V
Actuator Type	Round (Pin Plunger)	Round (Pin Plunger)	Round (Pin Plunger)
Mounting Type	Chassis Mount	Chassis Mount	Chassis Mount
Termination Style	Screw Terminal	Screw Terminal	Screw Terminal
Operating Force	255-368gf	500gf	370gf
Release Force	113gf	114gf	80gf
Operating Position	0.835" (21.2mm)	0.625" (15.9mm)	0.846" (21.5mm)
Pretravel	0.015" (0.4mm)	0.015" (0.4mm)	0.075" (1.9mm)
Differential Travel	0.002" (0.05mm)	0.006" (0.15mm)	0.002" (0.05mm)
Overtravel	0.060" (1.5mm)	0.005" (0.13mm)	0.062" (1.6mm)
Operating Temperature	-55°C to 85°C	-65°C to 400°C	-15°C to 80°C
Mechanical Life	20,000,000 Cycles	100,000 Cycles	20,000,000 Cycles
Electrical Life	Not specified	50,000 Cycles	500,000 Cycles
RoHS Status	RoHS Compliant	ROHS3 Compliant	RoHS Compliant
Packaging	Not specified	Tray	Bulk
Inventory	930 Pcs	1,038 Pcs	996 Pcs

Engineering Selection Recommendations

TZ-1G Selection Criteria:

The TZ-1G is suitable as a direct substitute for the BZ-2RD72-A2 when current and voltage requirements are met at 1A AC and 125V AC. Both parts share identical circuit configuration (SPDT), switch function (On-Mom), actuator type (round pin plunger), mounting type (chassis mount), and termination style (screw terminal). The TZ-1G is ROHS3 compliant and maintains RoHS compliance. Mechanical life of 100,000 cycles is lower than the BZ-2RD72-A2 specification of 20,000,000 cycles. Operating temperature range of -65°C to 400°C exceeds the BZ-2RD72-A2 range of -55°C to 85°C. Operating force of 500gf is higher than the BZ-2RD72-A2 range of 255-368gf. Pretravel specification is identical at 0.015" (0.4mm). Tray packaging is available with 1,038 units in stock.

Z-01HD55-B Selection Criteria:

The Z-01HD55-B is not suitable as a direct substitute for the BZ-2RD72-A2 due to current rating limitation. The Z-01HD55-B is rated for 100mA AC/DC, which is below the 1A AC requirement of the BZ-2RD72-A2. This part shares identical circuit configuration (SPDT), switch function (On-Mom), actuator type (round pin plunger), mounting type (chassis mount), and termination style (screw terminal). The Z-01HD55-B is RoHS compliant. Mechanical life of 20,000,000 cycles matches the BZ-2RD72-A2 specification. Operating temperature range of -15°C to 80°C is narrower than the BZ-2RD72-A2 range. Operating force of 370gf falls within the BZ-2RD72-A2 range of 255-368gf. Bulk packaging is available with 996 units in stock. Selection of this part requires verification that application current requirements do not exceed 100mA.

Frequently Asked Questions (FAQ)

Q: Can the TZ-1G replace the BZ-2RD72-A2 in all applications?

A: The TZ-1G meets the primary electrical and mechanical compatibility criteria for SPDT snap action switches with 1A AC and 125V AC ratings. However, the TZ-1G has a lower mechanical life specification (100,000 cycles versus 20,000,000 cycles) and higher operating force (500gf versus 255-368gf). Applications requiring the full 20,000,000 cycle mechanical life or lower actuation force must evaluate whether the TZ-1G specifications are acceptable for the specific use case.

Q: Why is the Z-01HD55-B listed as a substitute if it has a lower current rating?

A: The Z-01HD55-B is listed as an identified substitute part based on the provided substitute list. However, the 100mA AC/DC current rating is below the 1A AC requirement of the BZ-2RD72-A2. This part is suitable only for applications where the actual current draw does not exceed 100mA. Applications requiring the full 1A capacity must use the BZ-2RD72-A2 or TZ-1G.

Q: What are the key differences in mechanical specifications between these parts?

A: Operating force differs significantly: BZ-2RD72-A2 requires 255-368gf, TZ-1G requires 500gf, and Z-01HD55-B requires 370gf. Operating position varies: BZ-2RD72-A2 is 0.835" (21.2mm), TZ-1G is 0.625" (15.9mm), and Z-01HD55-B is 0.846" (21.5mm). Pretravel is identical between BZ-2RD72-A2 and TZ-1G at 0.015" (0.4mm), but Z-01HD55-B has 0.075" (1.9mm) pretravel. These differences may affect mechanical fit and actuation characteristics in the application.

Q: What packaging options are available for each part?

A: The BZ-2RD72-A2 packaging type is not specified in the provided data. The TZ-1G is available in tray packaging with 1,038 units in stock. The Z-01HD55-B is available in bulk packaging with 996 units in stock. Packaging selection should align with procurement and assembly requirements.

Q: Are all three parts RoHS compliant?

A: Yes. The BZ-2RD72-A2 is RoHS Compliant. The TZ-1G is ROHS3 Compliant. The Z-01HD55-B is RoHS Compliant. All three parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: What is the temperature operating range for each part?

A: The BZ-2RD72-A2 operates from -55°C to 85°C. The TZ-1G operates from -65°C to 400°C, providing extended low and high temperature capability. The Z-01HD55-B operates from -15°C to 80°C, which is the most limited range. Application temperature requirements should be matched against these specifications.

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