Equivalent & Substitute Parts for Honeywell 1SM61 SPDT Snap Action Switch

Part Overview

The Honeywell 1SM61 is an SPDT (Single Pole Double Throw) snap action switch with a 5A current rating, designed for chassis mount applications with solder lug termination. This switch operates at 250V AC and 30V DC, featuring a round pin plunger actuator and On-Momentary function. The product is Active status and RoHS Compliant, with unlimited moisture sensitivity level rating.

Substitute parts are identified when equivalent electrical and mechanical parameters align within the allowed specifications for this snap action switch category, enabling direct functional replacement in circuit designs.

Substiute Parts

1SM61

Honeywell Sensing and Productivity SolutionsIn Stock: 8791SM61 Datasheet

Current PartRFQ

MS0850500F060S1A

E-SwitchIn Stock: 1035MS0850500F060S1A Datasheet

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MS0850500F080S1A

E-SwitchIn Stock: 1289MS0850500F080S1A Datasheet

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MS0850500F250S1A

E-SwitchIn Stock: 1435MS0850500F250S1A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Honeywell 1SM61 are identified from the E-Switch MS0850500 series based on the following critical parameters that determine functional equivalence:

Mandatory Matching Parameters:

• Circuit configuration: SPDT
• Switch function: On-Momentary
• Current rating: 5A AC
• Actuator type: Round (Pin Plunger)
• Mounting type: Chassis Mount
• Termination style: Solder Lug
• Product status: Active

Allowable Parameter Variations: The substitute parts operate at 125V AC, which is lower than the main part's 250V AC rating. This represents a voltage derating and is acceptable for applications requiring lower voltage operation. Operating force values differ across the substitute variants (60gf, 80gf, 250gf) due to different actuator spring configurations within the same MS0850500 base platform.

Identified Substitutes:

• MS0850500F060S1A (60gf operating force)
• MS0850500F080S1A (80gf operating force)
• MS0850500F250S1A (250gf operating force)

All three substitutes share the same base product number MS0850500 and are manufactured by E-Switch with ROHS3 Compliance and REACH Unaffected status.

Parameter Comparison

Engineering Selection Recommendations

Voltage Derating Consideration: The E-Switch MS0850500 series substitutes operate at 125V AC maximum, compared to the Honeywell 1SM61's 250V AC rating. Selection of these substitutes is appropriate for applications operating at or below 125V AC. Applications requiring the full 250V AC rating of the original part cannot use these substitutes.

Operating Force Selection: Three E-Switch variants are available with different operating forces: 60gf, 80gf, and 250gf. The Honeywell 1SM61 operates at 141gf. Selection between the three variants depends on the specific actuator force requirements of the application:

• MS0850500F060S1A: Lowest actuation force
• MS0850500F080S1A: Moderate actuation force, closest to original 141gf specification
• MS0850500F250S1A: Highest actuation force

Temperature Range: The Honeywell 1SM61 operates from -55°C to 125°C. The E-Switch substitutes operate from -25°C to 85°C. Applications requiring operation below -25°C or above 85°C must use the original Honeywell part.

Compliance Status: All substitute parts carry ROHS3 Compliance and REACH Unaffected status, meeting current environmental regulations. The original Honeywell 1SM61 is RoHS Compliant.

Mechanical Life: E-Switch substitutes provide 1,000,000 mechanical cycles compared to the Honeywell 1SM61's 80,000 cycles, offering extended operational life in high-cycle applications.

Frequently Asked Questions (FAQ)

Q: Can the E-Switch MS0850500 series directly replace the Honeywell 1SM61 in all applications?

A: Direct replacement is limited to applications operating at 125V AC or lower. The Honeywell 1SM61 is rated for 250V AC, which exceeds the substitute parts' maximum voltage rating. Additionally, applications requiring operation below -25°C or above 85°C must use the original Honeywell part due to temperature range limitations of the substitutes.

Q: What is the difference between the three E-Switch substitute variants?

A: The three MS0850500 variants differ in operating force specification: MS0850500F060S1A (60gf), MS0850500F080S1A (80gf), and MS0850500F250S1A (250gf). The operating force determines the actuator pressure required to trigger the switch. Selection depends on the mechanical design requirements of the application. The MS0850500F080S1A provides the closest operating force match to the original 141gf specification.

Q: Are the substitute parts compatible with the same PCB layout and mechanical mounting?

A: The substitute parts share identical mounting type (Chassis Mount), termination style (Solder Lug), and nearly identical operating position (0.335" versus 0.330" for the original). These minimal dimensional differences are within typical mechanical tolerance for chassis mount snap action switches. Verification of specific mechanical fit within the application enclosure is recommended.

Q: What compliance certifications apply to the substitute parts?

A: The E-Switch MS0850500 series carries ROHS3 Compliance and REACH Unaffected status. The original Honeywell 1SM61 is RoHS Compliant. Both meet current environmental and regulatory requirements for electronic components.

Q: Do the substitute parts have the same electrical life rating?

A: The Honeywell 1SM61 does not specify electrical life. The E-Switch substitutes specify 50,000 electrical cycles. The E-Switch substitutes provide 1,000,000 mechanical cycles compared to the Honeywell 1SM61's 80,000 mechanical cycles.

Q: What is the moisture sensitivity level for the substitute parts?

A: All substitute parts carry Moisture Sensitivity Level 1 (Unlimited), identical to the original Honeywell 1SM61. This indicates no moisture sensitivity restrictions for storage or handling.