Honeywell LSH4L3 Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The Honeywell LSH4L3 is a snap action DPDT (double pole double throw) switch rated for 10A AC at 120V, designed for chassis mount applications with screw terminal connections. This component features a side rotary actuator without lever and is classified as obsolete. Due to its obsolete product status, identifying equivalent substitute parts is essential for ongoing system maintenance, repair, and new design implementations where this switch function is required.

Substiute Parts

LSH4L3

Honeywell Sensing and Productivity SolutionsIn Stock: 825LSH4L3 Datasheet

Current PartRFQ

LS2H4L3

Honeywell Sensing and Productivity SolutionsIn Stock: 970LS2H4L3 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete LSH4L3 is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Circuit configuration must be DPDT (DB/DM)
• Switch function must be On-Momentary
• Current rating must support minimum 10A AC
• AC voltage rating must be 120V or higher
• DC voltage rating must be 115V or higher

Mechanical Equivalence Requirements:

• Actuator type must be Side Rotary without lever
• Mounting type must be Chassis Mount
• Termination style must be Screw Terminal
• Operating force must be 19gfm
• Travel specifications (pretravel 9°, differential travel 4°, overtravel 66°) must match

Compliance Requirements:

• RoHS Compliant status required
• MSL rating must be 1 (Unlimited) or equivalent

Parts meeting all these criteria are classified as direct substitutes. The Honeywell LS2H4L3 satisfies all substitution parameters.

Parameter Comparison

Engineering Selection Recommendations

The Honeywell LS2H4L3 is a direct functional equivalent to the obsolete LSH4L3. Selection of the LS2H4L3 as a substitute is supported by the following engineering factors:

Electrical Compatibility: All electrical parameters are identical or superior. The LS2H4L3 maintains the same 10A AC and 800mA DC current ratings, with DC voltage rating increased from 115V to 120V, providing enhanced margin.

Mechanical Compatibility: All mechanical specifications are identical, including actuator type, mounting configuration, termination style, and travel characteristics. Physical and functional interchangeability is confirmed.

Thermal Performance: The LS2H4L3 extends the lower operating temperature limit from -1°C to -12°C, providing broader environmental capability while maintaining the upper limit of 121°C.

Regulatory Compliance: Both parts maintain RoHS Compliance and MSL 1 (Unlimited) ratings, ensuring compatibility with current manufacturing and environmental standards.

Product Availability: The LS2H4L3 holds Active product status with 872 units in stock, ensuring supply continuity for replacement and new applications.

Frequently Asked Questions (FAQ)

Q: Can the LS2H4L3 directly replace the LSH4L3 in existing applications?

A: Yes. The LS2H4L3 is electrically and mechanically equivalent to the LSH4L3 across all specified parameters. Identical circuit configuration (DPDT), current ratings (10A AC, 800mA DC), voltage ratings (120V AC, 120V DC), actuator type, mounting method, and termination style confirm direct substitutability.

Q: What are the key differences between these two parts?

A: The primary differences are product status and operating temperature range. The LSH4L3 is obsolete with an operating range of -1°C to 121°C, while the LS2H4L3 is active with an extended lower temperature limit of -12°C to 121°C. The LS2H4L3 also has a slightly higher DC voltage rating (120V versus 115V).

Q: Are there any mechanical compatibility concerns when substituting?

A: No. Both parts share identical mechanical specifications: Side Rotary actuator without lever, Chassis Mount configuration, Screw Terminal termination, 19gfm operating force, and identical travel characteristics (9° pretravel, 4° differential travel, 66° overtravel).

Q: Do both parts meet current regulatory requirements?

A: Yes. Both the LSH4L3 and LS2H4L3 are RoHS Compliant and carry MSL 1 (Unlimited) ratings, meeting current environmental and moisture sensitivity standards.

Q: Why is the LS2H4L3 preferred for new designs?

A: The LS2H4L3 is preferred because it maintains Active product status, ensuring long-term availability and supply chain stability. It also provides extended temperature range capability and improved DC voltage rating, offering design margin benefits.

Q: Are there any circuit or functional differences?

A: No. Both parts are DPDT (DB/DM) configuration with On-Momentary switch function. Electrical behavior, switching characteristics, and circuit application are identical.