BZ-2RDT Equivalent & Substitute Parts Reference

Part Overview

The BZ-2RDT is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis mount switch is rated for 15A at 125V AC and 500mA at 125V DC, featuring a round pin plunger actuator with screw terminal connections. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing applications requiring SPDT snap action switching at comparable electrical ratings and mechanical specifications.

Substiute Parts

BZ-2RDT

Honeywell Sensing and Productivity SolutionsIn Stock: 1019BZ-2RDT Datasheet

Current PartRFQ

GPTCNC11

ZF ElectronicsIn Stock: 740GPTCNC11 Datasheet

SimilarRFQ

TZ-1G

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

SimilarRFQ

Z-01HD55-B

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-2RDT is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Actuator type must be round pin plunger
• Termination style must be screw terminal
• Voltage rating must support 125V AC minimum

Secondary Compatibility Considerations:

• Current rating at 125V AC (minimum 15A required for direct substitution)
• Mounting type (chassis mount preferred for form factor compatibility)
• Operating force range and mechanical life specifications
• Operating temperature range overlap with application requirements

The three substitute parts listed (GPTCNC11, TZ-1G, Z-01HD55-B) share the core SPDT circuit, On-Momentary function, round pin plunger actuator, and screw terminal configuration. However, each presents distinct trade-offs in current capacity, voltage ratings, and mechanical characteristics that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

GPTCNC11 (ZF Electronics) – Primary Electrical Equivalent

The GPTCNC11 provides the closest electrical match to the BZ-2RDT, maintaining 15A at 125V AC current capacity and identical SPDT On-Momentary configuration. Both parts share equivalent mechanical life ratings (20,000,000 cycles) and comparable operating force specifications. The primary difference is mounting type: GPTCNC11 is panel mount versus BZ-2RDT chassis mount. This part is currently active and ROHS3 compliant. Selection of GPTCNC11 requires mechanical redesign to accommodate panel mount configuration.

Z-01HD55-B (Omron) – Mechanical & Environmental Equivalent

The Z-01HD55-B maintains chassis mount configuration and mechanical life equivalent to the BZ-2RDT (20,000,000 cycles). Operating position (0.846" vs. 0.835") and operating force (370 gf vs. 368–538 gf range) are closely aligned. However, current capacity is significantly reduced to 100mA AC/DC at 125V, limiting this part to low-current applications only. This part is currently active and RoHS compliant. Selection requires verification that application current requirements do not exceed 100mA.

TZ-1G (Omron) – Limited Substitution

The TZ-1G shares chassis mount configuration and round pin plunger actuator with the BZ-2RDT but provides only 1A AC at 125V current capacity. Mechanical life is substantially lower (100,000 cycles vs. 20,000,000 cycles). Operating position differs significantly (0.625" vs. 0.835"). This part is currently active and ROHS3 compliant. Selection is restricted to applications with current requirements below 1A and lower cycle life expectations.

Substitution Priority:

1. GPTCNC11 for applications where 15A @ 125V AC capacity is required and panel mount configuration is acceptable
2. Z-01HD55-B for applications where chassis mount configuration and 20,000,000 cycle life are required but current is limited to 100mA maximum
3. TZ-1G only for low-current applications (≤1A) where cycle life requirements are below 100,000 cycles

Frequently Asked Questions (FAQ)

Q: Can GPTCNC11 directly replace BZ-2RDT in existing designs?

A: GPTCNC11 provides electrical equivalence (15A @ 125V AC, SPDT On-Momentary) but differs in mounting type (panel mount vs. chassis mount). Mechanical redesign of the mounting interface is required. Electrical performance and current capacity are equivalent.

Q: What is the primary limitation of Z-01HD55-B as a BZ-2RDT substitute?

A: Current capacity is reduced to 100mA AC/DC at 125V, compared to BZ-2RDT's 15A AC / 500mA DC. This part is suitable only for low-current switching applications. Mechanical life (20,000,000 cycles) and chassis mount configuration match the original part.

Q: Why does TZ-1G have lower mechanical life than BZ-2RDT?

A: TZ-1G is specified for 100,000 mechanical cycles versus BZ-2RDT's 20,000,000 cycles. This reflects different design specifications and intended application duty cycles. TZ-1G is not suitable for high-cycle applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. BZ-2RDT 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 operating temperature range consideration for substitution?

A: BZ-2RDT operates −55°C to 85°C. GPTCNC11 operates 0°C to 55°C (narrower range). TZ-1G operates −65°C to 400°C (extended range). Z-01HD55-B operates −15°C to 80°C. Application temperature requirements must fall within the selected substitute's operating range.

Q: Can packaging type affect substitution decisions?

A: Packaging (Bulk, Tray) affects inventory handling and supply chain logistics but does not impact electrical or mechanical compatibility. All substitute parts are available in standard packaging formats suitable for production environments.

Q: What is the significance of operating position differences between parts?

A: Operating position (0.625" to 0.846") affects mechanical interface design and actuator engagement depth. Significant differences (such as TZ-1G at 0.625" vs. BZ-2RDT at 0.835") may require mechanical redesign of actuator mounting and travel clearances.