Honeywell 2LS1 Snap Action Switch SPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 2LS1 is an active-status snap action switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 10A AC at 120V and 800mA DC at 115V. This chassis-mounted switch features a round pin plunger actuator, screw terminal connections, and IP67 ingress protection suitable for dust-tight and waterproof applications. The part is RoHS Compliant and carries MSL Level 1 (Unlimited) moisture sensitivity rating.

Equivalent and substitute parts are identified when alternative manufacturers provide snap action switches with matching or compatible electrical ratings, circuit configurations, mounting types, and termination styles that satisfy the same application requirements.

Substiute Parts

2LS1

Honeywell Sensing and Productivity SolutionsIn Stock: 9852LS1 Datasheet

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D4B-2171N

Omron Automation and SafetyIn Stock: 1249D4B-2171N Datasheet

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D4B-4170N-NPT

Omron Automation and SafetyIn Stock: 1081D4B-4170N-NPT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Honeywell 2LS1 are identified based on the following critical parameters that determine functional compatibility:

Primary Matching Criteria:

• Circuit configuration: SPDT (DB/DM)
• Switch function: On-Mom (On-Momentary)
• AC current rating: 10A minimum
• AC voltage rating: 120V minimum
• Mounting type: Chassis Mount
• Termination style: Screw Terminal
• Ingress protection: IP67 or equivalent

Secondary Compatibility Factors:

• Actuator type (Round Pin Plunger or Roller Plunger acceptable for mechanical interchangeability)
• Operating position and travel specifications (within application tolerance)
• Operating temperature range (must encompass or exceed -29°C to 71°C)
• Product status: Active
• Compliance certifications: RoHS or ROHS3

The Omron D4B series switches (D4B-2171N and D4B-4170N-NPT) meet these criteria with SPDT circuit configuration, 10A AC at 120V rating, chassis mount design, screw terminals, and IP67 protection. Both parts are active-status products with appropriate compliance ratings.

Parameter Comparison

Engineering Selection Recommendations

Omron D4B-4170N-NPT is the primary substitute for Honeywell 2LS1 based on the following factors:

• Identical actuator type (Round Pin Plunger) provides direct mechanical compatibility
• Operating position of 1.380" (35.0mm) closely matches the 2LS1 specification of 1.330" (33.8mm)
• Maintains all critical electrical parameters: 10A AC at 120V, SPDT circuit, On-Mom function
• Active product status with established supply availability (1009 Pcs in stock)
• Extended operating temperature range (-40°C to 80°C) encompasses the 2LS1 range
• Electrical life rating of 500,000 cycles and mechanical life of 30,000,000 cycles provide documented performance data
• REACH Unaffected status confirms regulatory compliance for international applications

Omron D4B-2171N serves as an alternative substitute with the following considerations:

• Roller Plunger actuator differs from the 2LS1 Round Pin Plunger design, requiring mechanical interface verification
• Operating position of 1.890" (48.0mm) represents a significant deviation from the 2LS1 specification
• Maintains electrical compatibility with 10A AC at 120V and SPDT circuit configuration
• Active product status with higher inventory availability (1178 Pcs in stock)
• Extended operating temperature range and documented lifecycle ratings
• ROHS3 Compliant status meets environmental requirements

Both Omron substitutes maintain IP67 ingress protection, screw terminal connections, and chassis mount configuration. Selection between D4B-4170N-NPT and D4B-2171N depends on mechanical space constraints and actuator type requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the Omron D4B-4170N-NPT directly replace the Honeywell 2LS1 without modification?

A: The D4B-4170N-NPT shares identical circuit configuration (SPDT), switch function (On-Mom), electrical ratings (10A AC at 120V), mounting type (Chassis Mount), termination style (Screw Terminal), and actuator type (Round Pin Plunger). Operating position specifications are within 0.050" (1.27mm) of each other. Direct replacement is feasible for applications where this positional tolerance is acceptable. Mechanical mounting interface must be verified against application-specific requirements.

Q: What is the key difference between D4B-4170N-NPT and D4B-2171N?

A: The primary difference is the actuator type. D4B-4170N-NPT uses a Round Pin Plunger (matching the 2LS1 design), while D4B-2171N uses a Roller Plunger. Additionally, D4B-2171N has a significantly longer operating position of 1.890" (48.0mm) compared to D4B-4170N-NPT at 1.380" (35.0mm). Both maintain identical AC electrical ratings and circuit configuration.

Q: Are there DC current rating differences between the 2LS1 and Omron substitutes?

A: Yes. The Honeywell 2LS1 is rated for 800mA DC at 115V, while both Omron D4B series switches are rated for 6A DC at 30V. For DC applications, the Omron parts provide higher current capacity but at a lower voltage rating. Applications requiring the specific 115V DC rating of the 2LS1 must evaluate whether the 30V DC rating of Omron substitutes is compatible with system design.

Q: Do the substitute parts have documented lifecycle ratings?

A: Yes. Both Omron D4B-2171N and D4B-4170N-NPT specify 500,000 electrical life cycles and 30,000,000 mechanical life cycles. The Honeywell 2LS1 does not provide published electrical or mechanical life specifications in the available documentation.

Q: What is the temperature operating range difference?

A: The Honeywell 2LS1 operates from -29°C to 71°C. Both Omron D4B series substitutes operate from -40°C to 80°C, providing an extended range that encompasses the 2LS1 specification with additional margin at both temperature extremes.

Q: Are all three parts RoHS compliant?

A: The Honeywell 2LS1 is RoHS Compliant. The Omron D4B-2171N is ROHS3 Compliant. The Omron D4B-4170N-NPT has RoHS status listed as "Not applicable." For applications requiring RoHS certification, the D4B-2171N provides explicit ROHS3 compliance. The D4B-4170N-NPT status should be clarified with the manufacturer for specific compliance requirements.

Q: What packaging format is available for these parts?

A: All three parts are supplied in Bulk packaging. Honeywell 2LS1 has 910 Pcs in stock, Omron D4B-2171N has 1178 Pcs in stock, and Omron D4B-4170N-NPT has 1009 Pcs in stock.

Q: Can I use D4B-2171N if space constraints prevent using D4B-4170N-NPT?

A: The D4B-2171N Roller Plunger actuator may be suitable for applications where the Round Pin Plunger design is not required. However, the 1.890" (48.0mm) operating position is substantially longer than the 2LS1 at 1.330" (33.8mm). Mechanical interface compatibility and available actuation space must be verified before selection.