Honeywell 1SM2 Snap Action Switch SPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 1SM2 is a snap action switch with Single Pole Double Throw (SPDT) circuit configuration, rated for 5A at 250V AC and 30V DC. This component features a round pin plunger actuator and chassis mount termination with solder lugs. The 1SM2 is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing applications and new designs. Active alternatives from Honeywell and compatible manufacturers provide functional equivalency with updated product status and compliance certifications.

Substiute Parts

1SM2

Honeywell Sensing and Productivity SolutionsIn Stock: 8701SM2 Datasheet

Current PartRFQ

1SM3

Honeywell Sensing and Productivity SolutionsIn Stock: 10191SM3 Datasheet

DirectRFQ

MBZ101A01C01X01

APEM Inc.In Stock: 741MBZ101A01C01X01 Datasheet

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MBZ101A01C02X01

APEM Inc.In Stock: 792MBZ101A01C02X01 Datasheet

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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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MS0850500F295S1A

E-SwitchIn Stock: 732MS0850500F295S1A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the Honeywell 1SM2 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters for Direct Substitution:

• Circuit configuration (SPDT)
• Switch function (On-Momentary)
• Current rating (5A minimum)
• AC voltage rating (250V minimum)
• Actuator type (Round pin plunger)
• Mounting type (Chassis mount)
• Termination style (Solder lug)

Substitute Categories:

Category 1: Direct Honeywell Equivalent The 1SM3 is the active production equivalent from Honeywell Sensing and Productivity Solutions within the SM series. This part maintains identical electrical ratings, circuit configuration, and mechanical mounting specifications as the 1SM2.

Category 2: Higher Current Rating Alternatives The APEM MBZ101A01C01X01 and MBZ101A01C02X01 provide 10A AC current rating with 250V AC voltage rating. These parts accommodate applications requiring higher current capacity while maintaining SPDT configuration and chassis mount design. Operating force differs at 285gf compared to 1SM2 at 141gf.

Category 3: Reduced Voltage Rating Alternatives The E-Switch MS0850500 series (MS0850500F060S1A, MS0850500F080S1A, MS0850500F250S1A, MS0850500F295S1A) provides 5A AC current rating at 125V AC voltage rating. These parts are suitable for applications not requiring 250V AC rating. Operating force variants range from 60gf to 295gf.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Honeywell 1SM3

The 1SM3 is the direct active equivalent for the obsolete 1SM2. Both parts are manufactured by Honeywell Sensing and Productivity Solutions within the SM series and maintain identical electrical specifications (5A AC/DC, 250V AC, 30V DC), mechanical characteristics (141gf operating force, 0.330" operating position), and operating temperature range (-55°C to 125°C). The 1SM3 carries active product status and RoHS compliance certification, making it the preferred replacement for direct substitution in existing designs.

Secondary Recommendation: APEM MBZ101A01C01X01 or MBZ101A01C02X01

These APEM alternatives provide higher current capacity (10A AC) at 250V AC rating, suitable for applications requiring increased current handling. Both parts maintain SPDT configuration, chassis mount design, and solder lug termination. The MBZ series offers significantly extended mechanical life (10,000,000 cycles versus 80,000 cycles) and ROHS3 compliance. Operating force is elevated at 285gf. Operating temperature range is reduced to -40°C to 85°C. These parts are appropriate for new designs where higher current capacity and extended mechanical life are beneficial.

Tertiary Recommendation: E-Switch MS0850500 Series

The E-Switch MS0850500 series (MS0850500F060S1A, MS0850500F080S1A, MS0850500F250S1A, MS0850500F295S1A) provides 5A AC current rating at reduced voltage (125V AC). These parts are suitable for applications not requiring 250V AC rating. The series offers multiple operating force options (60gf to 295gf) to match specific actuation requirements. All variants provide extended mechanical life (1,000,000 cycles) and ROHS3 compliance. Operating temperature range is reduced to -25°C to 85°C. These parts are appropriate for applications with lower voltage requirements and where operating force selection is critical.

Frequently Asked Questions (FAQ)

Q: Can the 1SM3 directly replace the 1SM2 in existing applications?

A: Yes. The 1SM3 maintains identical electrical ratings (5A AC/DC, 250V AC, 30V DC), circuit configuration (SPDT), switch function (On-Momentary), actuator type (round pin plunger), mounting type (chassis mount), and termination style (solder lug). Operating force, operating position, and operating temperature range are identical. The 1SM3 is the direct active equivalent.

Q: What are the key differences between the Honeywell 1SM3 and APEM MBZ101 series?

A: The primary difference is current rating: 1SM3 is rated 5A AC/DC at 250V AC, while MBZ101 is rated 10A AC at 250V AC. Operating force differs (141gf versus 285gf). Mechanical life is significantly higher for MBZ101 (10,000,000 cycles versus 80,000 cycles). Operating temperature range is narrower for MBZ101 (-40°C to 85°C versus -55°C to 125°C). Both maintain SPDT configuration and chassis mount design.

Q: Are the E-Switch MS0850500 series parts suitable for 250V AC applications?

A: No. The MS0850500 series is rated for 125V AC maximum. These parts are suitable only for applications not requiring 250V AC rating. If 250V AC rating is required, use the Honeywell 1SM3 or APEM MBZ101 series.

Q: What is the significance of operating force differences among substitute parts?

A: Operating force determines the physical effort required to actuate the switch. The 1SM2 and 1SM3 require 141gf. The APEM MBZ101 series requires 285gf (higher actuation force). The E-Switch MS0850500 series ranges from 60gf to 295gf depending on model. Selection depends on the mechanical design and actuation method of the application.

Q: Do all substitute parts have identical packaging?

A: No. The Honeywell 1SM2 and 1SM3 use standard packaging (not specified). APEM MBZ101 series uses Tray packaging. E-Switch MS0850500 series uses Bulk packaging. Packaging differences may affect procurement, handling, and inventory management.

Q: What is the impact of reduced operating temperature range in substitute parts?

A: The 1SM2 and 1SM3 operate from -55°C to 125°C. APEM MBZ101 series operates from -40°C to 85°C. E-Switch MS0850500 series operates from -25°C to 85°C. If the application requires operation below -40°C or above 85°C, the Honeywell 1SM3 is required.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 1SM2 is RoHS Compliant. The 1SM3 is RoHS Compliant. The APEM MBZ101 series is ROHS3 Compliant. The E-Switch MS0850500 series is ROHS3 Compliant. All parts meet environmental compliance requirements.

Q: What is the difference between 5A AC/DC rating and 5A AC rating?

A: The 1SM2 and 1SM3 are rated for 5A at both AC and DC voltages. The E-Switch MS0850500 series is rated for 5A AC only, with no DC rating specified. If DC operation is required, use the Honeywell 1SM3.

Q: How do mechanical life ratings compare among substitute parts?

A: The 1SM2 and 1SM3 are rated for 80,000 mechanical cycles. The APEM MBZ101 series is rated for 10,000,000 mechanical cycles (125 times higher). The E-Switch MS0850500 series is rated for 1,000,000 mechanical cycles (12.5 times higher). Higher mechanical life ratings indicate longer component durability under repeated actuation.