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

Part Overview

The BZLN-2-LH is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, classified as a Single Pole Double Throw (SPDT) momentary contact switch. This component is rated for 15A AC at 125V and features a round pin plunger actuator with left-side mounting configuration. The product is currently obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and legacy equipment support.

Substiute Parts

BZLN-2-LH

Honeywell Sensing and Productivity SolutionsIn Stock: 1116BZLN-2-LH 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-LH is based on electrical equivalence across the following critical parameters:

Electrical Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be On-Momentary
• Current rating must support minimum 15A AC at 125V
• Voltage rating must support minimum 125V AC and DC
• RoHS compliance status must match or exceed the original specification

Mechanical Compatibility Criteria:

• Mounting type must be Chassis Mount
• Physical interface must accommodate standard chassis mounting configurations

The substitute part ZE-QA2-2S meets these electrical and mechanical requirements. However, differences exist in actuator type, termination style, and operational characteristics that must be evaluated during integration.

Parameter Comparison

Engineering Selection Recommendations

Electrical Suitability: The ZE-QA2-2S maintains full electrical equivalence with the BZLN-2-LH across all critical parameters: SPDT circuit, 15A AC at 125V rating, and 500mA DC rating. Both components are RoHS compliant and suitable for equivalent electrical applications.

Product Status Consideration: The BZLN-2-LH is obsolete, while the ZE-QA2-2S is an active product with current manufacturing support. This status difference supports the use of ZE-QA2-2S for new designs and ongoing supply chain requirements.

Integration Factors: Substitution requires evaluation of the following differences:

1. Actuator Type: The BZLN-2-LH uses a round pin plunger actuator, while the ZE-QA2-2S uses a lever with roller. Physical space constraints and actuation method compatibility must be verified in the target application.

2. Termination Style: The BZLN-2-LH terminates with wire leads, while the ZE-QA2-2S uses screw terminals. Wiring harness modifications or adapter solutions may be required.

3. Operating Temperature: The ZE-QA2-2S supports -10°C to 80°C, which covers the BZLN-2-LH range of -32°C to 71°C in the upper portion but does not extend to the lower -32°C specification. Applications requiring operation below -10°C must retain the original component or identify alternative substitutes.

4. Ingress Protection: The ZE-QA2-2S provides IP60 dust-tight protection, exceeding the BZLN-2-LH specification. This enhancement is beneficial in contaminated environments.

Frequently Asked Questions (FAQ)

Q: Can the ZE-QA2-2S directly replace the BZLN-2-LH in all applications?

A: Electrical substitution is valid for applications within the overlapping operating temperature range (-10°C to 71°C). Physical integration requires verification of actuator type compatibility and termination style adaptation. Applications requiring operation below -10°C require alternative solutions.

Q: What are the key differences between these two switches?

A: The primary differences are actuator type (pin plunger versus lever-roller), termination style (wire leads versus screw terminal), and operating temperature range. Electrical ratings and circuit configuration are identical.

Q: Is the ZE-QA2-2S suitable for applications requiring the original -32°C lower temperature limit?

A: No. The ZE-QA2-2S minimum operating temperature is -10°C. Applications requiring -32°C operation must use the original BZLN-2-LH or identify alternative components with equivalent low-temperature specifications.

Q: What modifications are needed to integrate the ZE-QA2-2S in place of the BZLN-2-LH?

A: Termination style conversion from wire leads to screw terminals is required. Mechanical mounting verification for the lever-roller actuator versus the pin plunger design is necessary. Physical space and actuation force requirements must be confirmed.

Q: Are both components RoHS compliant?

A: Yes. Both the BZLN-2-LH and ZE-QA2-2S are RoHS compliant, meeting environmental and regulatory requirements.

Q: What is the inventory status of these components?

A: The BZLN-2-LH has 1,007 pieces in stock as a legacy component. The ZE-QA2-2S has 687 pieces in stock as an active product with ongoing manufacturing support.