Honeywell LSP1A-1D Snap Action Switch: Equivalent & Substitute Parts

Part Overview

The Honeywell LSP1A-1D is a snap action switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 10A AC at 120V and 800mA DC at 115V. This component features a side rotary roller actuator with chassis mount termination and is designed for On-Momentary switch function applications. The LSP1A-1D is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain electrical compatibility across voltage and current ratings while accommodating mechanical and termination differences in the application environment.

Substiute Parts

LSP1A-1D

Honeywell Sensing and Productivity SolutionsIn Stock: 788LSP1A-1D Datasheet

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LSA1A-1D

Honeywell Sensing and Productivity SolutionsIn Stock: 952LSA1A-1D Datasheet

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D4A-3103N

Omron Automation and SafetyIn Stock: 757D4A-3103N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LSP1A-1D are identified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Electrical Compatibility Parameters:

• Circuit configuration must be SPDT (DB/DM)
• Switch function must be On-Momentary
• Current rating must support minimum 10A AC operation
• Voltage rating must support minimum 120V AC operation
• DC ratings must accommodate 800mA at 115V or higher

Mechanical Compatibility Parameters:

• Actuator type must be side rotary with roller mechanism
• Mounting type must be chassis mount
• Operating temperature range must encompass or exceed -12°C to 121°C
• Pretravel, differential travel, and overtravel angles define actuation characteristics

Regulatory & Compliance Parameters:

• RoHS compliance status
• Moisture sensitivity level classification

Two substitute parts meet these criteria with documented compatibility: the Honeywell LSA1A-1D (active product status, same manufacturer) and the Omron D4A-3103N (active product status, alternative manufacturer). Both maintain SPDT circuit configuration, On-Momentary function, and chassis mount design. Variations in termination style, ingress protection rating, and specific travel angles represent design trade-offs that must be evaluated against application requirements.

Parameter Comparison

Engineering Selection Recommendations

Honeywell LSA1A-1D Selection Criteria:

The LSA1A-1D is the primary substitute for the obsolete LSP1A-1D. Both components are manufactured by Honeywell Sensing and Productivity Solutions within the HDLS series. The LSA1A-1D maintains identical electrical ratings (10A AC at 120V, 800mA DC at 115V), identical actuator configuration (side rotary roller), identical mounting type (chassis mount), and identical termination style (plug in). Operating force remains at 46gfm. The LSA1A-1D is classified as active product status, ensuring ongoing availability and supply chain continuity. Both parts are RoHS compliant with MSL 1 classification. Minor differences in pretravel (15° versus 9°), differential travel (5° versus 3°), and overtravel (60° versus 66°) represent design refinements within the HDLS series. The LSA1A-1D is available in bulk packaging with 931 pieces in current inventory.

Omron D4A-3103N Selection Criteria:

The D4A-3103N serves as an alternative substitute when Honeywell components are unavailable or when application requirements align with its specific characteristics. The D4A-3103N maintains SPDT circuit configuration, On-Momentary function, 10A AC rating at 125V, and chassis mount design. Key differentiators include: termination style (screw terminal versus plug in), lower operating force (20gfm versus 46gfm), higher DC current rating (6A versus 800mA), higher DC voltage rating (30V versus 115V), extended lower temperature range (-20°C versus -12°C), and IP67 ingress protection rating. The D4A-3103N includes documented electrical life (1,000,000 cycles) and mechanical life (50,000,000 cycles) specifications. This component is classified as active product status with 731 pieces in current inventory. Selection of the D4A-3103N requires confirmation that screw terminal connection is compatible with the application's wiring infrastructure and that the lower operating force (20gfm) aligns with actuator engagement requirements.

Frequently Asked Questions (FAQ)

Q: Why is the LSP1A-1D classified as obsolete?

A: The LSP1A-1D is an older design within the Honeywell HDLS series. Honeywell has transitioned to the LSA1A-1D as the active product line replacement, which incorporates design refinements while maintaining core electrical and mechanical compatibility.

Q: Can the LSA1A-1D be used as a direct replacement for the LSP1A-1D?

A: The LSA1A-1D is electrically and mechanically compatible with the LSP1A-1D for applications requiring 10A AC at 120V, 800mA DC at 115V, side rotary roller actuation, and chassis mount configuration. Both components use plug-in termination and maintain identical operating force (46gfm). Minor differences in pretravel and overtravel angles fall within acceptable design variation for SPDT snap action switches. Verification of specific application requirements is necessary before implementation.

Q: What are the key differences between the LSA1A-1D and D4A-3103N?

A: The LSA1A-1D is a Honeywell component with plug-in termination and 46gfm operating force. The D4A-3103N is an Omron component with screw terminal termination and 20gfm operating force. The D4A-3103N provides higher DC current capacity (6A versus 800mA) and includes IP67 ingress protection. The LSA1A-1D maintains identical operating temperature range to the original LSP1A-1D (-12°C to 121°C), while the D4A-3103N operates from -20°C to 100°C. Selection depends on termination compatibility, environmental protection requirements, and actuator force specifications.

Q: Is the D4A-3103N suitable for applications requiring 115V DC operation?

A: The D4A-3103N is rated for 30V DC maximum, which is below the 115V DC requirement of the LSP1A-1D. The D4A-3103N is not suitable for applications requiring 115V DC operation. The LSA1A-1D maintains the 115V DC rating and is the appropriate substitute for such applications.

Q: What is the significance of the pretravel and overtravel angle differences?

A: Pretravel (9° for LSP1A-1D, 15° for LSA1A-1D and D4A-3103N) defines the actuator rotation before electrical contact occurs. Overtravel (66° for LSP1A-1D, 60° for LSA1A-1D, 70° for D4A-3103N) defines maximum safe actuator rotation. These differences reflect design refinements in snap action mechanism geometry. Applications with mechanical constraints on actuator movement must confirm compatibility with the specific pretravel and overtravel specifications of the selected substitute.

Q: Are all three components RoHS compliant?

A: Yes. The LSP1A-1D, LSA1A-1D, and D4A-3103N are all RoHS compliant with MSL 1 (Unlimited) moisture sensitivity level classification. All three components carry ECCN EAR99 and HTSUS 8536.50.9055 classifications.

Q: What packaging options are available?

A: The LSP1A-1D is available in standard packaging with 698 pieces in current inventory. The LSA1A-1D is available in bulk packaging with 931 pieces in current inventory. The D4A-3103N is available in bulk packaging with 731 pieces in current inventory.

Q: Does the operating force difference between LSA1A-1D (46gfm) and D4A-3103N (20gfm) affect compatibility?

A: Operating force defines the mechanical effort required to actuate the switch. The LSA1A-1D requires 46gfm, matching the original LSP1A-1D. The D4A-3103N requires only 20gfm, representing a 57% reduction in required actuation force. Applications with mechanical actuators or manual operation must confirm that the selected component's operating force aligns with the available actuation mechanism. Lower operating force may be advantageous in applications with limited mechanical input, but may be unsuitable for applications requiring higher actuation resistance.