Honeywell BZ-2RST04 Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell BZ-2RST04 is a snap action switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 15A AC at 125V and 500mA DC at 125V. This component features an overtravel plunger actuator and chassis mount termination with screw terminals. The BZ-2RST04 is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and new design implementations. Equivalent alternatives maintain the core electrical and mechanical specifications while offering active product status and improved availability.

Substiute Parts

BZ-2RST04

Honeywell Sensing and Productivity SolutionsIn Stock: 955BZ-2RST04 Datasheet

Current PartRFQ

BZ-2RS-A2

Honeywell Sensing and Productivity SolutionsIn Stock: 973BZ-2RS-A2 Datasheet

SimilarRFQ

Z-15G-B

Omron Automation and SafetyIn Stock: 1404Z-15G-B Datasheet

SimilarRFQ

Z-15GK55-B

Omron Automation and SafetyIn Stock: 1056Z-15GK55-B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BZ-2RST04 is determined by strict alignment with the following critical parameters:

Primary Compatibility Criteria:

• Circuit type: SPDT configuration required
• Switch function: On-Momentary operation
• AC current rating: Minimum 15A at 125V
• Mounting configuration: Chassis mount with screw terminals
• Mechanical life: Minimum 20,000,000 cycles
• RoHS compliance status

Substitutes are grouped into two categories:

Category 1 - Direct Honeywell Series Equivalent (BZ-2RS-A2): Maintains identical manufacturer lineage, electrical ratings, and mechanical specifications with active product status.

Category 2 - Cross-Manufacturer Alternatives (Z-15G-B, Z-15GK55-B): Omron switches meeting core electrical and mechanical requirements with chassis mount configuration and screw terminal termination. These alternatives operate within the specified voltage and current parameters for AC applications.

Parameter Comparison

Engineering Selection Recommendations

BZ-2RS-A2 (Honeywell): This substitute provides the closest functional equivalence to the BZ-2RST04. Both components share identical electrical ratings (15A AC at 125V, 500mA DC at 125V), mechanical life specifications (20,000,000 cycles), operating temperature range (-55°C to 85°C), and actuator geometry (overtravel plunger with 1.110" operating position). The BZ-2RS-A2 maintains active product status and RoHS compliance. Selection of this part eliminates design modification requirements and ensures direct compatibility with existing mechanical and electrical interfaces.

Z-15G-B (Omron): This alternative meets the core AC electrical requirements (15A at 125V) and maintains 20,000,000 cycle mechanical life. The round pin plunger actuator and reduced operating position (0.625" versus 1.110") require mechanical interface verification. DC voltage rating is limited to 30V, restricting use in DC applications. Operating temperature range (-25°C to 80°C) is narrower than the original specification. This substitute is suitable for AC-primary applications with standard environmental conditions.

Z-15GK55-B (Omron): This variant matches the operating position (1.110") and AC electrical rating (15A at 125V) of the original component. The elevated operating force (540gf) and extended pretravel (0.090") represent significant mechanical differences requiring actuator mechanism compatibility assessment. DC voltage limitation (30V) and narrower operating temperature range (-15°C to 80°C) apply. IP62 ingress protection rating provides enhanced environmental sealing. This substitute is applicable for AC applications in sealed or moisture-exposed environments.

Frequently Asked Questions (FAQ)

Q: Can the BZ-2RS-A2 be used as a direct replacement for the BZ-2RST04 without design modification?

A: Yes. The BZ-2RS-A2 maintains identical electrical ratings (15A AC at 125V, 500mA DC at 125V), mechanical life (20,000,000 cycles), operating temperature range (-55°C to 85°C), and physical actuator specifications (overtravel plunger, 1.110" operating position). Both components use chassis mount configuration with screw terminals. No design modification is required.

Q: What are the key differences between Honeywell BZ-2RS-A2 and Omron Z-15G-B substitutes?

A: The primary differences are: (1) Actuator type—BZ-2RS-A2 uses overtravel plunger versus Z-15G-B round pin plunger; (2) Operating position—BZ-2RS-A2 operates at 1.110" versus Z-15G-B at 0.625"; (3) DC voltage rating—BZ-2RS-A2 rated 125V DC versus Z-15G-B limited to 30V DC; (4) Operating temperature—BZ-2RS-A2 rated -55°C to 85°C versus Z-15G-B -25°C to 80°C. Both maintain 15A AC at 125V and 20,000,000 cycle mechanical life.

Q: Are the Omron Z-15G-B and Z-15GK55-B interchangeable?

A: No. While both are Omron Z-series switches with identical AC electrical ratings and mechanical life, they differ in: (1) Operating force—Z-15G-B requires 250-350gf versus Z-15GK55-B requires 540gf; (2) Operating position—Z-15G-B operates at 0.625" versus Z-15GK55-B at 1.110"; (3) Pretravel—Z-15G-B has 0.015" versus Z-15GK55-B has 0.090"; (4) Ingress protection—Z-15G-B is IP00 versus Z-15GK55-B is IP62. Selection depends on specific mechanical interface and environmental requirements.

Q: What is the impact of DC voltage rating differences on substitution?

A: The BZ-2RST04 and BZ-2RS-A2 are rated 125V DC, while Omron Z-series alternatives are limited to 30V DC. If the application requires DC operation above 30V, only Honeywell BZ-2RS-A2 is suitable. For applications operating exclusively at AC 125V or DC below 30V, Omron alternatives are acceptable.

Q: How do packaging differences affect part selection?

A: BZ-2RST04 is supplied in bulk packaging, BZ-2RS-A2 in bulk, Z-15G-B in tray, and Z-15GK55-B in bulk. Packaging affects inventory management and handling procedures but does not impact electrical or mechanical compatibility. Verify packaging requirements with procurement specifications.

Q: What compliance certifications apply to each substitute?

A: BZ-2RST04 and BZ-2RS-A2 are RoHS Compliant. Z-15G-B and Z-15GK55-B are ROHS3 Compliant. All four parts are classified as EAR99 for export control purposes. Z-15GK55-B is REACH Affected; all others are REACH Unaffected. Verify compliance requirements with applicable regulatory standards for your application region.