Equivalent & Substitute Parts for Honeywell 1LS501

Part Overview

The Honeywell 1LS501 is a snap action SPDT switch rated for 10A at 120V AC, featuring a side rotary roller actuator with chassis mount configuration. This component is classified as Obsolete in its current product status. Due to obsolescence, identifying functionally equivalent active alternatives is essential for ongoing system maintenance, repair, and new design implementations where this switch type is required.

Substiute Parts

1LS501

Honeywell Sensing and Productivity SolutionsIn Stock: 9261LS501 Datasheet

Current PartRFQ

1LS1

Honeywell Sensing and Productivity SolutionsIn Stock: 12391LS1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1LS501 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Circuit configuration: SPDT (DB/DM)
• Switch function: On-Mom
• Current rating: 10A AC minimum
• Voltage rating: 120V AC minimum
• Actuator type: Side rotary roller
• Mounting type: Chassis mount
• Termination style: Screw terminal
• Ingress protection: IP67 or equivalent
• Operating temperature range: -29°C to 71°C or broader
• RoHS compliance status

The substitute part 1LS1 meets all mandatory matching parameters and is classified as Active in product status, making it a direct functional equivalent for the obsolete 1LS501.

Parameter Comparison

Engineering Selection Recommendations

The 1LS1 is the direct equivalent substitute for the obsolete 1LS501 based on the following engineering criteria:

Functional Equivalence: Both parts share identical circuit configuration (SPDT DB/DM), switch function (On-Mom), current and voltage ratings for AC operation, actuator geometry, mounting configuration, and termination method. All mechanical parameters including operating force, release force, and travel distances are identical.

Compliance Status: Both the 1LS501 and 1LS1 are RoHS Compliant, ensuring regulatory alignment for applications subject to RoHS requirements. The 1LS1 carries additional REACH Unaffected status documentation.

Product Availability: The 1LS1 maintains Active product status with 1150 units in current inventory, providing reliable supply chain continuity for replacement and new applications. The 1LS501, classified as Obsolete, has limited availability (822 units) and represents end-of-life inventory.

Enhanced Capability: The 1LS1 provides supplementary DC electrical ratings (800mA at 115V DC) not specified in the 1LS501 documentation, offering expanded application flexibility without compromising AC performance equivalence.

Frequently Asked Questions (FAQ)

Q: Can the 1LS1 directly replace the 1LS501 in existing applications?

A: Yes. The 1LS1 is a direct functional equivalent. All critical electrical parameters (10A AC at 120V), mechanical parameters (operating force, travel distances), and physical characteristics (chassis mount, screw terminals, IP67 rating) are identical. No circuit modifications or mechanical adaptations are required.

Q: What is the primary reason to transition from 1LS501 to 1LS1?

A: The 1LS501 is classified as Obsolete, indicating discontinued manufacturing and declining inventory availability. The 1LS1 is an Active product with current manufacturing support and reliable supply chain availability, making it the appropriate choice for new designs and ongoing maintenance.

Q: Are there any electrical differences between these parts?

A: Both parts are equivalent for AC operation at 10A and 120V. The 1LS1 includes additional DC ratings (800mA at 115V DC) that are not specified for the 1LS501. This represents an enhancement rather than a limitation, as AC performance remains identical.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both the 1LS501 and 1LS1 are RoHS Compliant. The 1LS1 additionally carries REACH Unaffected status. Both are classified under ECCN EAR99 for export control purposes.

Q: Are the mechanical actuation characteristics identical?

A: Yes. Operating force (51gfm), release force (8.640gfm), operating position (20°), pretravel (20°), differential travel (12°), and overtravel (30°) are identical between both parts. Operating temperature range (-29°C to 71°C) is also identical.

Q: What packaging options are available?

A: Both parts are supplied in Bulk packaging configuration, suitable for integration into manufacturing and assembly processes.

Q: Is the 1LS1 suitable for applications requiring both AC and DC operation?

A: The 1LS1 supports both AC operation (10A at 120V) and DC operation (800mA at 115V). The 1LS501 documentation specifies only AC ratings. For applications requiring DC switching capability, the 1LS1 provides this additional functionality.