BZ-RX243 Equivalent & Substitute Parts Reference

Part Overview

The BZ-RX243 is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with solder lug termination. This component features a round pin plunger actuator and is rated for 15A AC at 125V and 500mA DC at 125V. The product is currently obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning. Substitute parts must maintain SPDT circuit configuration and chassis mount compatibility while accommodating application-specific voltage and current requirements.

Substiute Parts

BZ-RX243

Honeywell Sensing and Productivity SolutionsIn Stock: 1159BZ-RX243 Datasheet

Current PartRFQ

A-20GD

Omron Automation and SafetyIn Stock: 1123A-20GD Datasheet

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X-10GW21

Omron Automation and SafetyIn Stock: 686X-10GW21 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BZ-RX243 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Circuit and Switching Function: All substitutes must maintain SPDT (Single Pole Double Throw) circuit configuration to preserve switching topology.

Voltage and Current Ratings: Substitutes must support the application voltage and current requirements. The BZ-RX243 operates at 15A AC / 125V AC and 500mA DC / 125V DC. Substitute parts must equal or exceed these ratings in their respective operating modes.

Mounting and Termination: Chassis mount configuration with solder lug termination is mandatory for mechanical and electrical integration compatibility.

Actuator Type and Operating Characteristics: The round pin plunger actuator defines the mechanical interface. Substitutes with different actuator types (such as lever actuators) represent functional alternatives for applications where actuator geometry can be accommodated.

Environmental and Compliance Requirements: Operating temperature range and RoHS compliance status must align with application requirements and regulatory mandates.

The two identified substitutes—A-20GD and X-10GW21—represent different substitution scenarios based on application voltage and current requirements.

Parameter Comparison

Engineering Selection Recommendations

A-20GD (Omron Automation and Safety) - Primary Substitute for AC Applications

The A-20GD is suitable for applications requiring 125V AC operation. This part maintains SPDT circuit configuration, chassis mount design, and solder lug termination identical to the BZ-RX243. The A-20GD provides 20A AC capacity at 125V, exceeding the BZ-RX243 specification of 15A AC. However, the A-20GD is rated for 30V DC maximum, which does not meet the BZ-RX243 DC voltage rating of 125V. The A-20GD is therefore appropriate only for applications operating exclusively in AC mode or where DC operation is limited to 30V or below. The part is currently active in production with RoHS compliance maintained. Operating temperature range is -25°C to 80°C, which is narrower than the BZ-RX243 range of -55°C to 85°C; applications requiring extended low-temperature operation below -25°C are not suitable for this substitute.

X-10GW21 (Omron Automation and Safety) - Substitute for Low-Voltage DC Applications

The X-10GW21 is suitable for applications operating at 30V DC or below. This part maintains SPDT circuit configuration, chassis mount design, and solder lug termination. The X-10GW21 provides 10A DC capacity at 30V. This part features a lever actuator rather than the round pin plunger of the BZ-RX243, representing a different mechanical interface that may require design accommodation. The X-10GW21 is currently active in production with RoHS compliance maintained. Operating temperature range is -25°C to 80°C. This substitute is not suitable for applications requiring 125V operation or AC switching at standard line voltages.

Compliance and Availability

Both substitute parts maintain RoHS compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring regulatory alignment with the original BZ-RX243. Both substitutes are currently active products with documented inventory availability, providing supply chain continuity for obsolete BZ-RX243 applications.

Frequently Asked Questions (FAQ)

Q: Can the A-20GD replace the BZ-RX243 in all applications?

A: The A-20GD is suitable only for applications operating at 125V AC. It cannot replace the BZ-RX243 in applications requiring 125V DC operation, as the A-20GD is rated for 30V DC maximum. Additionally, the A-20GD operating temperature range (-25°C to 80°C) does not extend to the low-temperature limit of the BZ-RX243 (-55°C).

Q: What is the difference between the switch functions "On-On" and "On-Mom"?

A: The BZ-RX243 uses "On-On" function, meaning both switch positions are stable and maintained without continued actuator pressure. The A-20GD and X-10GW21 use "On-Mom" (On-Momentary) function, where one position is stable and the other returns to the original position when actuator pressure is released. This functional difference affects circuit behavior and must be evaluated for application compatibility.

Q: Why does the X-10GW21 have a different actuator type?

A: The X-10GW21 uses a lever actuator instead of the round pin plunger found on the BZ-RX243. This represents a different mechanical interface suitable for applications where lever actuation is acceptable. The lever actuator affects the physical mounting geometry and actuation method, requiring design review before substitution.

Q: Are both substitute parts RoHS compliant?

A: Yes, both the A-20GD and X-10GW21 are RoHS compliant, maintaining regulatory alignment with the BZ-RX243.

Q: What is the mechanical life difference between the BZ-RX243 and the substitutes?

A: The BZ-RX243 specifies 20,000,000 mechanical cycles, while both A-20GD and X-10GW21 specify 1,000,000 mechanical cycles. Applications requiring extended operational life with high cycle counts should account for this 20-fold difference in rated mechanical life.

Q: Can the X-10GW21 operate at 125V?

A: No. The X-10GW21 is rated for 30V DC maximum and is not suitable for 125V applications. This part is designed exclusively for low-voltage DC circuits.

Q: Do all three parts use the same termination method?

A: Yes, all three parts—BZ-RX243, A-20GD, and X-10GW21—use solder lug termination, ensuring electrical connection compatibility with existing PCB designs.