Honeywell LSA9A Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The Honeywell LSA9A is an active-status snap action switch with Single Pole Double Throw (SPDT) configuration, rated for 10A AC at 120V. This component is designed for chassis mount applications requiring reliable switching with status indication capability. The switch features side rotary actuation without lever engagement and plug-in termination for rapid installation.

Substitute parts are identified to address inventory availability, regional sourcing requirements, or specific application constraints while maintaining functional equivalence within defined electrical and mechanical parameters.

Substiute Parts

LSA9A

Honeywell Sensing and Productivity SolutionsIn Stock: 1106LSA9A Datasheet

Current PartRFQ

D4A-1E01N

Omron Automation and SafetyIn Stock: 890D4A-1E01N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Omron D4A-1E01N is identified as a direct functional equivalent to the Honeywell LSA9A based on the following substitution criteria:

Matching Parameters:

• SPDT circuit configuration (DB/DM topology)
• 10A AC current rating
• Side rotary actuator without lever
• Chassis mount installation interface
• Momentary (On-Mom) switch function
• Status indicator feature
• RoHS compliant designation
• Pretravel angle (15°) and differential travel (5°)

Allowable Variations:

• AC voltage rating: LSA9A operates at 120V; D4A-1E01N rated at 125V (higher rating accommodates LSA9A application)
• Termination style: LSA9A uses plug-in; D4A-1E01N uses screw terminal (both are standard chassis mount terminations)
• Operating force: LSA9A 46gfm; D4A-1E01N 40gfm (within acceptable actuation tolerance range)
• Ingress protection: D4A-1E01N provides IP67 rating (enhanced environmental protection)
• Operating temperature: D4A-1E01N range -10°C to 80°C (subset of LSA9A range; acceptable for most applications)

Parameter Comparison

Engineering Selection Recommendations

Primary Selection - Honeywell LSA9A: Select the LSA9A when the application requires plug-in termination, operates within the extended temperature range (-12°C to 93°C), or when DC voltage operation at 115V is required. The LSA9A maintains active product status with 1085 units in current inventory.

Substitute Selection - Omron D4A-1E01N: The D4A-1E01N is suitable as a substitute when screw terminal connection is acceptable or preferred for permanent installation. This part is appropriate for applications operating within the -10°C to 80°C temperature envelope and where AC voltage operation at 125V is compatible with the circuit design. The D4A-1E01N provides enhanced ingress protection (IP67) for applications requiring dust and moisture resistance. Both parts maintain RoHS compliance and unlimited moisture sensitivity rating (MSL 1).

Termination Consideration: The primary difference between these parts is termination style. The LSA9A plug-in termination enables rapid connection and disconnection, while the D4A-1E01N screw terminal provides fixed installation. Circuit design must accommodate the selected termination method.

Temperature Range Consideration: Applications requiring operation below -10°C or above 80°C must use the LSA9A. The D4A-1E01N operating range is a subset of the LSA9A specification.

DC Voltage Consideration: Applications requiring DC operation above 30V must use the LSA9A, which is rated to 115V DC. The D4A-1E01N is limited to 30V DC.

Frequently Asked Questions (FAQ)

Q: Can the Omron D4A-1E01N directly replace the Honeywell LSA9A in all applications?

A: The D4A-1E01N is functionally equivalent for AC applications operating within -10°C to 80°C and at voltages up to 125V AC. Applications requiring DC operation above 30V, temperatures below -10°C or above 80°C, or plug-in termination must use the LSA9A.

Q: What is the primary difference between these two switches?

A: The main differences are termination style (LSA9A uses plug-in; D4A-1E01N uses screw terminal), operating temperature range (LSA9A extends to -12°C and 93°C), and DC voltage rating (LSA9A rated to 115V DC versus D4A-1E01N at 30V DC). Both maintain identical SPDT circuit configuration, 10A AC rating, and momentary switch function.

Q: Are both parts RoHS compliant?

A: Yes. Both the Honeywell LSA9A and Omron D4A-1E01N are RoHS compliant with MSL 1 (unlimited moisture sensitivity).

Q: What does the SPDT (DB/DM) circuit configuration mean?

A: SPDT indicates Single Pole Double Throw, providing one common contact that switches between two separate circuits. The DB/DM designation refers to the specific contact arrangement and is identical in both parts.

Q: Can I use the D4A-1E01N in a circuit designed for the LSA9A if I adapt the termination?

A: Termination adaptation is possible only if the circuit design accommodates screw terminal connection. However, the application must also operate within the D4A-1E01N temperature range (-10°C to 80°C) and voltage specifications (125V AC maximum, 30V DC maximum).

Q: What is the operating force difference, and does it affect compatibility?

A: The LSA9A requires 46gfm (gram-force millimeters) while the D4A-1E01N requires 40gfm. This 6gfm difference is within acceptable actuation tolerance for equivalent switches and does not prevent substitution.

Q: Does the D4A-1E01N IP67 rating provide an advantage?

A: The D4A-1E01N IP67 rating (dust tight, waterproof) provides enhanced environmental protection compared to the LSA9A, which has no specified ingress protection rating. This makes the D4A-1E01N suitable for applications requiring moisture or dust resistance.

Q: What is the significance of the pretravel and differential travel angles?

A: Pretravel (15° in both parts) is the rotation angle before contact engagement. Differential travel (5° in both parts) is the angle between contact engagement and disengagement. Identical values confirm mechanical compatibility in the switching mechanism.