BZ-RD-A2 Equivalent & Substitute Parts Reference

Part Overview

The BZ-RD-A2 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with 15A AC at 125V rating. This component features a round pin plunger actuator and screw terminal termination, suitable for On-Mom switching function. The product is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, repair, and redesign applications. Substitute parts must maintain electrical compatibility while accommodating potential differences in mechanical mounting and performance characteristics.

Substiute Parts

BZ-RD-A2

Honeywell Sensing and Productivity SolutionsIn Stock: 885BZ-RD-A2 Datasheet

Current PartRFQ

GPTCNC11

ZF ElectronicsIn Stock: 740GPTCNC11 Datasheet

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TZ-1G

Omron Automation and SafetyIn Stock: 1058TZ-1G Datasheet

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Z-01HD55-B

Omron Automation and SafetyIn Stock: 1035Z-01HD55-B Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-RD-A2 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Mom
• Voltage rating (AC) must be 125V minimum
• Actuator type must be round pin plunger
• Termination style must be screw terminal
• Mechanical life must support 20,000,000 cycles minimum

Secondary Considerations:

• Current rating capacity (may exceed 15A requirement)
• Mounting type (chassis mount preferred; panel mount acceptable with mechanical adaptation)
• Operating temperature range (must encompass application requirements)
• RoHS compliance status

The three substitute parts identified (GPTCNC11, TZ-1G, Z-01HD55-B) share the core SPDT circuit, On-Mom function, 125V AC rating, round pin plunger actuator, and screw terminal configuration. However, each presents distinct trade-offs in current handling capacity, temperature range, and mechanical performance characteristics that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

GPTCNC11 (ZF Electronics)

The GPTCNC11 provides the closest electrical match to the BZ-RD-A2, maintaining identical 15A AC and 125V ratings with equivalent mechanical life (20,000,000 cycles). Both components are RoHS compliant. The primary difference is mounting type: GPTCNC11 is panel mount versus BZ-RD-A2 chassis mount. This substitution is suitable for applications where panel mount configuration is acceptable or where mechanical adaptation is feasible. Operating temperature range is narrower (0°C to 55°C) compared to the original part (-55°C to 85°C), requiring verification against application environment. Product status is active, ensuring long-term availability.

TZ-1G (Omron Automation and Safety)

The TZ-1G maintains SPDT circuit, On-Mom function, 125V AC rating, and chassis mount configuration. However, current rating is significantly reduced to 1A AC/DC, making this substitution suitable only for low-current applications. Mechanical life is substantially lower at 100,000 cycles versus 20,000,000 cycles. Operating temperature range is extended (-65°C to 400°C), providing superior thermal performance. ROHS3 compliance and active product status support long-term availability. This part is not recommended as a direct substitute for 15A applications.

Z-01HD55-B (Omron Automation and Safety)

The Z-01HD55-B maintains SPDT circuit, On-Mom function, 125V AC rating, and chassis mount configuration with equivalent mechanical life (20,000,000 cycles). Current rating is limited to 100mA, restricting use to low-current applications only. Operating temperature range (-15°C to 80°C) is narrower than the original part. RoHS compliance and active product status ensure availability. Ingress protection rating (IP62) exceeds the original specification. This part is not recommended as a direct substitute for 15A applications.

Frequently Asked Questions (FAQ)

Q: Can GPTCNC11 directly replace BZ-RD-A2 in existing designs?

A: GPTCNC11 provides electrical equivalence (15A AC, 125V, SPDT, On-Mom) and identical mechanical life. The primary difference is panel mount versus chassis mount configuration. Direct replacement requires mechanical adaptation or redesign of the mounting interface. Operating temperature range is narrower (0°C to 55°C), requiring verification against application environment specifications.

Q: Why are TZ-1G and Z-01HD55-B listed as substitutes if they have lower current ratings?

A: These parts are listed as substitutes because they share the core electrical circuit (SPDT), function (On-Mom), voltage rating (125V AC), and mechanical actuator type (round pin plunger). However, their significantly reduced current ratings (1A and 100mA respectively) restrict their use to applications with lower current requirements. They are not suitable for applications requiring the original 15A capacity.

Q: What is the impact of different operating force values on substitution?

A: Operating force differences (BZ-RD-A2: 170-269gf; GPTCNC11: 348gf; TZ-1G: 500gf; Z-01HD55-B: 370gf) affect actuator sensitivity and mechanical feel. Higher operating force requires greater physical effort to activate the switch. Application-specific requirements for actuation force must be evaluated independently. These differences do not prevent substitution but may require user interface or mechanical design adjustments.

Q: Are all substitute parts RoHS compliant?

A: Yes. BZ-RD-A2 is RoHS Compliant. GPTCNC11 and TZ-1G are ROHS3 Compliant. Z-01HD55-B is RoHS Compliant. All parts meet current environmental compliance requirements.

Q: What is the significance of product status (Obsolete vs. Active)?

A: BZ-RD-A2 is classified as obsolete, indicating discontinued manufacturing and limited availability. All three substitute parts (GPTCNC11, TZ-1G, Z-01HD55-B) are active products with ongoing manufacturing and long-term availability assurance. This supports system redesign and future procurement planning.

Q: How do packaging differences affect part selection?

A: BZ-RD-A2 is supplied in standard packaging. GPTCNC11 is supplied in bulk packaging. TZ-1G is supplied in tray packaging. Z-01HD55-B is supplied in bulk packaging. Packaging differences do not affect electrical or mechanical performance but may impact inventory management, handling procedures, and cost per unit. Verify packaging compatibility with receiving and storage procedures.

Q: Can operating temperature range differences affect substitution decisions?

A: Yes. BZ-RD-A2 operates from -55°C to 85°C. GPTCNC11 operates from 0°C to 55°C (narrower range). TZ-1G operates from -65°C to 400°C (extended range). Z-01HD55-B operates from -15°C to 80°C (narrower range). Application environment temperature requirements must be verified against substitute part specifications. Substitution is not recommended if application requires operation outside the substitute part's temperature range.