Honeywell 21SM368 Equivalent & Substitute Parts

Part Overview

The Honeywell 21SM368 is a snap action SPDT switch with chassis mount configuration, rated for 1A at 125V AC and 30V DC. This component features a round pin plunger actuator with solder lug termination and operates across a temperature range of -55°C to 125°C. The 21SM368 is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs. Direct replacements and functionally compatible alternatives are available from Honeywell and other manufacturers within the snap action switch category.

Substiute Parts

21SM368

Honeywell Sensing and Productivity SolutionsIn Stock: 83521SM368 Datasheet

Current PartRFQ

21SM366

Honeywell Sensing and Productivity SolutionsIn Stock: 97021SM366 Datasheet

DirectRFQ

MBZ101A01C01X01

APEM Inc.In Stock: 741MBZ101A01C01X01 Datasheet

SimilarRFQ

MBZ101A01C02X01

APEM Inc.In Stock: 792MBZ101A01C02X01 Datasheet

SimilarRFQ

MS0850500F060S1A

E-SwitchIn Stock: 1035MS0850500F060S1A Datasheet

SimilarRFQ

MS0850500F080S1A

E-SwitchIn Stock: 1289MS0850500F080S1A Datasheet

SimilarRFQ

MS0850500F250S1A

E-SwitchIn Stock: 1435MS0850500F250S1A Datasheet

SimilarRFQ

MS0850500F295S1A

E-SwitchIn Stock: 732MS0850500F295S1A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 21SM368 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Direct Equivalent Criteria:

• Circuit configuration: SPDT
• Switch function: On-Mom
• Actuator type: Round (Pin Plunger)
• Mounting type: Chassis Mount
• Termination style: Solder Lug
• Operating position: 0.330" (8.4mm)

Electrical Compatibility Criteria:

• Current rating: 1A minimum (AC/DC)
• Voltage rating - AC: 125V minimum
• Voltage rating - DC: 30V minimum

Mechanical Compatibility Criteria:

• Operating force: 85gf (±tolerance range)
• Release force: 28gf (±tolerance range)
• Mechanical life: 80,000 cycles minimum

Substitute parts are grouped into two categories:

Category 1 - Direct Honeywell Equivalent: The 21SM366 shares identical electrical and mechanical specifications with the 21SM368, differing only in product status (Active vs. Obsolete). This part maintains all critical parameters within the same tolerance band.

Category 2 - Cross-Manufacturer Alternatives: APEM Inc. MBZ101 series and E-Switch MS0850500 series parts provide functional substitution with parameter variations. These parts maintain SPDT configuration, chassis mount, and solder lug termination but feature different current ratings, voltage ratings, operating forces, and mechanical life specifications. Selection from this category requires verification that the application tolerates the parameter deviations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

The Honeywell 21SM366 is the primary substitute for the obsolete 21SM368. Both parts maintain identical electrical specifications (1A at 125V AC, 30V DC), mechanical characteristics (85gf operating force, 28gf release force), and operating temperature range (-55°C to 125°C). The 21SM366 is classified as Active product status, ensuring ongoing availability and supply chain continuity. Both parts carry RoHS Compliant certification and MSL 1 rating. This substitution requires no design modification and provides direct form-fit-function replacement.

For Cross-Manufacturer Alternatives:

APEM Inc. MBZ101A01C01X01 and MBZ101A01C02X01 parts are functionally compatible but feature elevated current ratings (10A AC), higher voltage ratings (250V AC), and significantly higher mechanical life (10,000,000 cycles). These parts carry ROHS3 Compliant certification and REACH Unaffected status. Selection of APEM alternatives is appropriate when applications require higher current capacity or extended mechanical life beyond the 80,000-cycle specification of the 21SM368.

E-Switch MS0850500 series parts (MS0850500F060S1A, MS0850500F080S1A, MS0850500F250S1A, MS0850500F295S1A) provide substitution with 5A AC current rating and 125V AC voltage rating. These parts feature variable operating forces (60gf to 295gf) and extended mechanical life (1,000,000 cycles). E-Switch alternatives carry ROHS3 Compliant certification and REACH Unaffected status. Operating temperature range is reduced to -25°C to 85°C compared to the 21SM368 specification. Selection of E-Switch alternatives is appropriate for applications operating within the reduced temperature range and requiring higher current capacity than 1A.

All substitute parts maintain SPDT circuit configuration, On-Mom switch function, round pin plunger actuator, chassis mount configuration, and solder lug termination. All substitute parts carry MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can the Honeywell 21SM366 directly replace the 21SM368 without design changes?

A: Yes. The 21SM366 maintains identical electrical ratings (1A at 125V AC, 30V DC), mechanical specifications (85gf operating force, 28gf release force), operating temperature range (-55°C to 125°C), and physical configuration (chassis mount, solder lug termination, round pin plunger actuator). Direct substitution is supported without circuit or mechanical modifications.

Q: What are the key differences between the Honeywell 21SM366 and APEM MBZ101 series?

A: The primary differences are current rating (1A vs. 10A AC), voltage rating (125V AC vs. 250V AC), operating force (85gf vs. 285gf), and mechanical life (80,000 cycles vs. 10,000,000 cycles). The APEM parts are rated for higher electrical loads and extended mechanical cycling. Operating temperature range is reduced in the APEM parts (-40°C to 85°C vs. -55°C to 125°C).

Q: What are the key differences between the Honeywell 21SM368 and E-Switch MS0850500 series?

A: The E-Switch parts feature higher current rating (5A AC vs. 1A AC/DC), identical voltage rating (125V AC), variable operating forces (60gf to 295gf vs. fixed 85gf), and extended mechanical life (1,000,000 cycles vs. 80,000 cycles). Operating temperature range is reduced in E-Switch parts (-25°C to 85°C vs. -55°C to 125°C). Operating position is slightly different (0.335" vs. 0.330").

Q: Are all substitute parts RoHS compliant?

A: Yes. The Honeywell 21SM366 carries RoHS Compliant certification. APEM MBZ101 series and E-Switch MS0850500 series parts carry ROHS3 Compliant certification. All parts meet RoHS requirements for hazardous substance restrictions.

Q: What is the packaging difference between substitute parts?

A: The Honeywell 21SM366 is packaged in standard format. APEM MBZ101 series parts are supplied in Tray packaging. E-Switch MS0850500 series parts are supplied in Bulk packaging. Packaging format does not affect electrical or mechanical performance.

Q: Can E-Switch MS0850500 parts be used in applications requiring -55°C operation?

A: No. E-Switch MS0850500 series parts are rated for -25°C to 85°C operating temperature range. Applications requiring -55°C minimum temperature operation must use the Honeywell 21SM366 or 21SM368, which are rated for -55°C to 125°C.

Q: Which substitute part is suitable for applications requiring 10A current capacity?

A: APEM Inc. MBZ101A01C01X01 and MBZ101A01C02X01 are rated for 10A AC current. These parts are suitable for applications exceeding the 1A rating of the 21SM368. E-Switch MS0850500 series parts are rated for 5A AC, providing intermediate current capacity between the 1A original specification and the 10A APEM rating.

Q: Are all substitute parts available in solder lug termination?

A: Yes. All substitute parts listed maintain solder lug termination style, consistent with the 21SM368 original specification.

Q: What is the mechanical life difference between the 21SM368 and substitute parts?

A: The 21SM368 is rated for 80,000 mechanical cycles. The Honeywell 21SM366 maintains this specification. APEM MBZ101 series parts are rated for 10,000,000 cycles. E-Switch MS0850500 series parts are rated for 1,000,000 cycles. Higher mechanical life ratings indicate extended component durability under repetitive actuation.