LSYAB4S Equivalent & Substitute Parts Reference

Part Overview

The LSYAB4S is a DPDT snap-action switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with screw terminal connections. This switch is rated for 50mA at 250V AC and 60V DC, featuring a side rotary actuator without lever. The LSYAB4S is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system maintenance and component procurement.

Substiute Parts

LSYAB4S

Honeywell Sensing and Productivity SolutionsIn Stock: 996LSYAB4S Datasheet

Current PartRFQ

LSA4S

Honeywell Sensing and Productivity SolutionsIn Stock: 920LSA4S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSYAB4S is determined by strict equivalence across the following critical parameters:

Electrical Specifications: Circuit configuration (DPDT DB/DM), switch function (On-Mom), current rating (50mA AC/DC), voltage ratings (250V AC / 60V DC), and termination style (Screw Terminal) must remain identical.

Mechanical Specifications: Actuator type (Side Rotary - No Lever), mounting type (Chassis Mount), operating force (46gfm), pretravel (15°), differential travel (7°), and overtravel (60°) must match exactly.

Environmental & Compliance: Operating temperature range, RoHS compliance status, and moisture sensitivity level must be compatible with the original application requirements.

The LSA4S qualifies as a direct substitute based on these parameters, with the exception of operating temperature range and product status variations noted in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

The LSA4S serves as the active equivalent to the obsolete LSYAB4S. Both components share identical electrical and mechanical specifications across all critical parameters: DPDT circuit configuration, 50mA current rating, 250V AC / 60V DC voltage ratings, side rotary actuator, chassis mount configuration, and screw terminal termination.

The primary distinction between these parts is product status: LSYAB4S is obsolete while LSA4S is currently active in the Honeywell product line. This status change makes LSA4S the appropriate selection for new procurement and system replacements.

Operating temperature range differs slightly: LSYAB4S operates from -40°C to 121°C, while LSA4S operates from -12°C to 121°C. Applications requiring operation below -12°C must account for this temperature range limitation in the substitute part.

Both components maintain RoHS compliance and identical moisture sensitivity levels (MSL 1 - Unlimited), ensuring regulatory and environmental compatibility with existing system requirements.

Frequently Asked Questions (FAQ)

Q: Can LSA4S directly replace LSYAB4S in existing applications?

A: LSA4S is electrically and mechanically equivalent to LSYAB4S across all specified parameters. Direct replacement is possible provided the application operating temperature does not fall below -12°C. If the original system operates at temperatures below -12°C, the narrower temperature range of LSA4S must be evaluated against application requirements.

Q: What is the primary reason for substituting LSYAB4S?

A: LSYAB4S is classified as obsolete. LSA4S is the active equivalent part from the same manufacturer and series, ensuring continued availability and supply chain continuity.

Q: Are the electrical ratings identical between LSYAB4S and LSA4S?

A: Yes. Both parts are rated for 50mA at 250V AC and 60V DC with identical DPDT circuit configuration and On-Mom switch function.

Q: Do the mechanical specifications match between these parts?

A: Yes. Operating force (46gfm), pretravel (15°), differential travel (7°), and overtravel (60°) are identical. Both use side rotary actuators without levers and chassis mount configurations with screw terminals.

Q: What packaging differences exist between LSYAB4S and LSA4S?

A: LSYAB4S packaging is not specified in available documentation. LSA4S is supplied in bulk packaging. Packaging requirements should be confirmed with the supplier based on application needs.

Q: Are both parts RoHS compliant?

A: Yes. Both LSYAB4S and LSA4S are RoHS compliant with identical moisture sensitivity levels (MSL 1 - Unlimited).

Q: What is the temperature range difference between these parts?

A: LSYAB4S operates from -40°C to 121°C. LSA4S operates from -12°C to 121°C. The substitute part has a narrower low-temperature operating range. Applications requiring operation below -12°C must evaluate this limitation.