BZ-2AT Equivalent & Substitute Parts Reference

Part Overview

The BZ-2AT is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) switch is designed for chassis mount applications with screw terminal connections, rated for 15A AC at 125V and 1A DC at 125V. The switch features a round pin plunger actuator and On-Momentary function, suitable for applications requiring reliable snap action switching with 20,000,000 mechanical life cycles.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative configurations that meet the electrical and mechanical requirements of the application.

Substiute Parts

BZ-2AT

Honeywell Sensing and Productivity SolutionsIn Stock: 1056BZ-2AT Datasheet

Current PartRFQ

DZ-10G-1B

Omron Automation and SafetyIn Stock: 1188DZ-10G-1B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZ-2AT is limited by the following critical parameters that must be maintained or exceeded in the replacement component:

Electrical Parameters:

• AC Current Rating: minimum 15A at 125V
• DC Current Rating: minimum 1A at 125V
• Circuit Configuration: SPDT or higher complexity (DPDT acceptable)
• Switch Function: On-Momentary operation

Mechanical Parameters:

• Actuator Type: Round pin plunger
• Mounting Type: Chassis mount
• Termination Style: Screw terminal
• Operating Temperature Range: must encompass -55°C to 85°C or be compatible with application limits

Compliance Parameters:

• RoHS Compliance required
• MSL rating of 1 or equivalent

The DZ-10G-1B from Omron Automation and Safety is identified as a substitute part. This substitution is valid under the following conditions: the application circuit can accommodate DPDT configuration (which provides additional switching capability beyond SPDT), the reduced AC current rating of 10A is acceptable for the specific load, and the DC voltage rating of 30V is sufficient for DC applications (lower than BZ-2AT but adequate for many industrial uses).

Parameter Comparison

Engineering Selection Recommendations

Primary Considerations for Substitution:

The DZ-10G-1B substitution is valid when all of the following conditions are met:

1. AC Current Requirement: Application load does not exceed 10A AC at 125V. If AC current requirement exceeds 10A, the DZ-10G-1B is not suitable.

2. DC Voltage Requirement: Application DC voltage does not exceed 30V. If DC voltage exceeds 30V, the DZ-10G-1B is not suitable.

3. Operating Temperature: Application operating temperature range falls within -25°C to 80°C. If extended low-temperature operation below -25°C or high-temperature operation above 80°C is required, the BZ-2AT is required.

4. Mechanical Cycle Life: Application cycle life requirement does not exceed 1,000,000 cycles. If higher cycle life is required, the BZ-2AT with 20,000,000 cycles is necessary.

5. Circuit Configuration: Application can accommodate DPDT configuration. The DZ-10G-1B provides two independent switching poles, which is compatible with SPDT applications but offers additional functionality.

Compliance Status:

Both parts maintain active product status and current RoHS compliance certifications. The DZ-10G-1B carries ROHS3 compliance and REACH Affected status, indicating current regulatory alignment. Both parts have MSL 1 rating, indicating unlimited moisture sensitivity protection.

Frequently Asked Questions (FAQ)

Q: Can the DZ-10G-1B directly replace the BZ-2AT in all applications?

A: No. The DZ-10G-1B is a conditional substitute. Substitution is valid only when the application AC current requirement is ≤10A, DC voltage is ≤30V, operating temperature is within -25°C to 80°C, and mechanical cycle life requirement is ≤1,000,000 cycles. Applications exceeding any of these parameters require the BZ-2AT.

Q: What is the primary difference between SPDT and DPDT configurations?

A: SPDT (Single Pole Double Throw) provides one independent switching pole with two throw positions. DPDT (Double Pole Double Throw) provides two independent switching poles, each with two throw positions. The DZ-10G-1B DPDT configuration is functionally compatible with SPDT applications but provides additional switching capability.

Q: Why is the mechanical life cycle rating different between these parts?

A: The BZ-2AT is rated for 20,000,000 mechanical cycles, while the DZ-10G-1B is rated for 1,000,000 cycles. This difference reflects different design specifications and intended application classes. Applications requiring high-cycle-count operation must use the BZ-2AT.

Q: Are the screw terminal connections compatible between these parts?

A: Both parts use screw terminal connections and are chassis mount. However, the DPDT configuration of the DZ-10G-1B provides additional terminals compared to the SPDT BZ-2AT. Wiring harnesses and terminal assignments must be verified against the specific part datasheets.

Q: What is the significance of the operating temperature range difference?

A: The BZ-2AT operates from -55°C to 85°C, while the DZ-10G-1B operates from -25°C to 80°C. Applications requiring operation below -25°C or above 80°C must use the BZ-2AT. The BZ-2AT is suitable for extended temperature range applications including aerospace and extreme environment uses.

Q: How do the current ratings affect substitution decisions?

A: The BZ-2AT is rated for 15A AC and 1A DC. The DZ-10G-1B is rated for 10A AC/DC. For AC applications, the DZ-10G-1B is limited to 10A maximum. For DC applications, the DZ-10G-1B provides higher current capacity (10A vs. 1A). Verify the actual load current before substitution.

Q: What packaging differences exist between these parts?

A: The BZ-2AT is supplied in standard packaging (not specified in parameters). The DZ-10G-1B is supplied in Tray packaging. Packaging differences may affect inventory management and handling procedures but do not affect electrical or mechanical compatibility.

Q: Are both parts currently available for procurement?

A: Both parts maintain active product status. The BZ-2AT has 953 pieces in stock, and the DZ-10G-1B has 1,102 pieces in stock. Availability should be confirmed with the respective manufacturers or authorized distributors for current procurement timelines.