Honeywell 21SM369 Snap Action Switch SPDT Equivalent & Substitute Parts

Part Overview

The Honeywell 21SM369 is a snap action switch with Single Pole Double Throw (SPDT) circuit configuration, rated for 5A at 250V AC and 30V DC. This chassis mount switch features a round pin plunger actuator with solder lug termination and is designed for on-momentary switch function applications. The 21SM369 is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this switch architecture.

Substiute Parts

21SM369

Honeywell Sensing and Productivity SolutionsIn Stock: 102921SM369 Datasheet

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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 21SM369 is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

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

Secondary Compatibility Parameters:

• Current rating: 5A minimum
• Voltage rating - AC: 250V minimum
• Operating temperature range: Must encompass or exceed -55°C to 125°C
• Mechanical life: 80,000 cycles minimum

The substitute parts identified fall into two distinct groups based on electrical ratings and operational characteristics:

Group 1 - APEM MBZ Series (Higher Current Rating): MBZ101A01C01X01 and MBZ101A01C02X01 provide 10A AC current rating at 250V AC, exceeding the 21SM369 specifications. These parts maintain SPDT configuration, on-momentary function, round pin plunger actuator, chassis mount, and solder lug termination. Operating position matches at 0.330" (8.4mm). Product status is active with ROHS3 compliance.

Group 2 - E-Switch MS Series (Matched Current Rating): MS0850500F060S1A, MS0850500F080S1A, MS0850500F250S1A, and MS0850500F295S1A maintain the 5A AC current rating of the 21SM369. These parts share SPDT configuration, on-momentary function, round pin plunger actuator, chassis mount, and solder lug termination. Operating position is 0.335" (8.5mm), within tolerance of the 21SM369 specification. All are active product status with ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Electrical Equivalence (5A Current Rating):

The E-Switch MS0850500 series parts (MS0850500F060S1A, MS0850500F080S1A, MS0850500F250S1A, MS0850500F295S1A) provide the closest electrical match to the 21SM369, maintaining 5A AC current rating. These parts are active product status with ROHS3 compliance certification. Selection within this series depends on required operating force: MS0850500F060S1A (60gf), MS0850500F080S1A (80gf), MS0850500F250S1A (250gf), or MS0850500F295S1A (295gf).

Limitation: E-Switch MS series parts are rated for 125V AC maximum, compared to the 21SM369 250V AC rating. Applications requiring 250V AC operation cannot use these substitutes.

For Higher Current Capacity (10A Rating):

The APEM MBZ101A01C01X01 and MBZ101A01C02X01 provide 10A AC current rating at 250V AC, exceeding the 21SM369 specifications. These parts are active product status with ROHS3 compliance. Both parts are electrically interchangeable with identical electrical and mechanical characteristics; selection between them is based on packaging preference (both supplied in trays).

Limitation: APEM MBZ series operating temperature range is -40°C to 85°C, which does not extend to the -55°C lower limit of the 21SM369. Applications requiring operation below -40°C cannot use these substitutes.

Compliance Considerations:

All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating, matching the 21SM369. All substitute parts carry ROHS3 compliance, meeting or exceeding the RoHS compliance status of the original part. ECCN and HTSUS classifications are consistent across all parts (EAR99 and 8536.50.7000 respectively).

Frequently Asked Questions (FAQ)

Q: Can the APEM MBZ101A01C01X01 or MBZ101A01C02X01 be used as direct replacements for the 21SM369 in all applications?

A: These APEM parts provide higher current capacity (10A versus 5A) and maintain 250V AC rating, making them suitable for applications where the 21SM369 was used at or below 5A. However, the operating temperature range of -40°C to 85°C does not extend to the -55°C minimum of the 21SM369. Applications requiring operation below -40°C require alternative solutions.

Q: What is the key difference between the E-Switch MS0850500 series variants?

A: The MS0850500 series variants differ in operating force specification: MS0850500F060S1A (60gf), MS0850500F080S1A (80gf), MS0850500F250S1A (250gf), and MS0850500F295S1A (295gf). All other electrical and mechanical parameters are identical. Selection depends on the actuator force requirement for the specific application.

Q: Can E-Switch MS0850500 series parts replace the 21SM369 in 250V AC applications?

A: No. E-Switch MS0850500 series parts are rated for 125V AC maximum, while the 21SM369 is rated for 250V AC. Using these parts in 250V AC circuits exceeds their voltage rating and is not permitted.

Q: Are there packaging differences between substitute options?

A: Yes. APEM MBZ101A01C01X01 and MBZ101A01C02X01 are supplied in trays. E-Switch MS0850500 series parts are supplied in bulk packaging. Packaging selection may affect procurement, handling, and inventory management procedures.

Q: Do all substitute parts maintain the same mechanical life as the 21SM369?

A: No. The 21SM369 specifies 80,000 mechanical cycles. APEM MBZ series parts provide 10,000,000 cycles, and E-Switch MS series parts provide 1,000,000 cycles. All substitutes exceed the original specification, providing extended mechanical life.

Q: What is the operating position tolerance between the 21SM369 and substitute parts?

A: The 21SM369 specifies 0.330" (8.4mm) operating position. APEM MBZ series maintains this specification at 0.330" (8.4mm). E-Switch MS series specifies 0.335" (8.5mm), a difference of 0.005" (0.1mm). This minor variation is within typical mechanical tolerances for snap action switches.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 21SM369 is RoHS Compliant. All substitute parts carry ROHS3 Compliant certification, meeting or exceeding the compliance requirement.

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

A: All substitute parts maintain MSL 1 (Unlimited) rating, identical to the 21SM369. This indicates no moisture sensitivity restrictions for storage, handling, or use.