BZLN-2-RH Snap Action Switch Equivalent & Substitute Parts

Part Overview

The BZLN-2-RH is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, classified as a Single Pole Double Throw (SPDT) device with chassis mount configuration. This switch is rated for 15A AC at 125V and 500mA DC at 125V, featuring a round pin plunger actuator with wire lead termination. The product is currently obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and component sourcing in legacy applications.

Substiute Parts

BZLN-2-RH

Honeywell Sensing and Productivity SolutionsIn Stock: 751BZLN-2-RH Datasheet

Current PartRFQ

ZE-QA2-2S

Omron Automation and SafetyIn Stock: 716ZE-QA2-2S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BZLN-2-RH is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

• Circuit configuration: SPDT (Single Pole Double Throw)
• Switch function: On-Momentary operation
• Current rating: 15A AC minimum
• Voltage rating: 125V AC and DC minimum
• Mounting type: Chassis Mount
• RoHS compliance status

Acceptable Variation Parameters:

• Actuator type (round pin plunger vs. lever/roller) — functionally interchangeable in chassis mount applications
• Termination style (wire leads vs. screw terminal) — requires mechanical/electrical interface adaptation
• Operating force and release force — acceptable within application-specific tolerance ranges
• Pretravel, differential travel, and overtravel — acceptable within mechanical design constraints
• Operating temperature range — acceptable if substitute range encompasses or exceeds original specification
• Ingress protection rating — acceptable if equal to or greater than original specification

The substitute part ZE-QA2-2S meets all mandatory matching criteria while introducing controlled variations in mechanical and operational characteristics that remain within acceptable engineering tolerances for equivalent functionality.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility: The ZE-QA2-2S (Omron Automation and Safety) is a valid functional equivalent for the obsolete BZLN-2-RH based on electrical and circuit equivalence.

Compliance Alignment: Both components maintain RoHS compliance and MSL 1 rating, ensuring regulatory and environmental compatibility in replacement scenarios.

Availability Status: The BZLN-2-RH is obsolete with no ongoing manufacturing. The ZE-QA2-2S is an active product with current inventory availability (687 units in stock), providing reliable sourcing for new applications and legacy system repairs.

Interface Considerations: The primary engineering consideration is termination style conversion. The BZLN-2-RH uses wire leads, while the ZE-QA2-2S employs screw terminals. This difference requires mechanical and electrical interface adaptation during installation but does not affect functional equivalence.

Mechanical Parameter Variations: The ZE-QA2-2S exhibits lower operating force (570gf vs. 1360gf) and different pretravel characteristics (4.0mm vs. 2.0mm). These variations are acceptable in chassis mount applications where actuator geometry and mechanical design accommodate the lever/roller actuator configuration of the substitute part.

Environmental Performance: The ZE-QA2-2S provides enhanced ingress protection (IP60) and extended upper operating temperature capability (80°C vs. 71°C), representing performance improvements over the original specification.

Frequently Asked Questions (FAQ)

Q: Can the ZE-QA2-2S directly replace the BZLN-2-RH without modification?

A: Electrical and circuit functionality are directly equivalent. However, termination style differs (wire leads vs. screw terminal), requiring connection interface adaptation. Mechanical mounting compatibility depends on chassis design accommodation of the lever/roller actuator versus the original pin plunger design.

Q: What is the significance of the operating force difference (1360gf vs. 570gf)?

A: Operating force represents the actuation pressure required to engage the switch. The ZE-QA2-2S requires approximately 42% less force due to its lever/roller actuator geometry. This variation is acceptable in applications where the mechanical design accommodates the substitute actuator type and does not affect electrical performance.

Q: Does the ZE-QA2-2S meet the same voltage and current specifications?

A: Yes. Both components are rated for 15A AC at 125V and 500mA DC at 125V. Electrical ratings are equivalent and interchangeable for circuit design purposes.

Q: Why does the pretravel specification differ between the two parts?

A: Pretravel (0.078" vs. 0.157") reflects the mechanical design of different actuator types. The pin plunger design of the BZLN-2-RH requires less travel distance than the lever/roller design of the ZE-QA2-2S. This variation is inherent to actuator geometry and does not affect functional equivalence in applications where mechanical clearance is available.

Q: Is the ZE-QA2-2S available for immediate sourcing?

A: Yes. The ZE-QA2-2S is an active product with 687 units in current inventory stock, providing reliable availability for replacement and new application requirements.

Q: What is the impact of the IP60 ingress protection rating on the ZE-QA2-2S?

A: IP60 (dust tight) provides enhanced environmental protection compared to the unspecified ingress protection of the BZLN-2-RH. This represents a performance improvement and expands application suitability in environments with dust or particulate exposure.

Q: Are both components RoHS compliant?

A: Yes. Both the BZLN-2-RH and ZE-QA2-2S are RoHS compliant with MSL 1 (unlimited) moisture sensitivity rating, ensuring regulatory alignment and environmental compatibility.