M2T28SA5W03 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The M2T28SA5W03 is a DPDT (Double Pole Double Throw) toggle switch manufactured by NKK Switches, rated for 6A AC at 125V and 3A DC at 30V. This through-hole mounted switch features a momentary-off-momentary (Mom-Off-Mom) function with a 12.70mm brass nickel-plated actuator and process-sealed terminals. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where similar electrical and mechanical characteristics are required.

Substiute Parts

M2T28SA5W03

NKK SwitchesIn Stock: 737M2T28SA5W03 Datasheet

Current PartRFQ

M2028SA2W03

NKK SwitchesIn Stock: 936M2028SA2W03 Datasheet

SimilarRFQ

100DP4T1B4M2QE

E-SwitchIn Stock: 916100DP4T1B4M2QE Datasheet

SimilarRFQ

7205P3Y9CQE

C&KIn Stock: 30337205P3Y9CQE Datasheet

SimilarRFQ

7205SY9CGE

C&KIn Stock: 9267205SY9CGE Datasheet

SimilarRFQ

E205SD1CQE

C&KIn Stock: 1065E205SD1CQE Datasheet

SimilarRFQ

U25SY9CQI

C&KIn Stock: 1116U25SY9CQI Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M2T28SA5W03 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Circuit configuration: DPDT
• Switch function: Mom-Off-Mom
• Mounting type: Through Hole
• Termination style: PC Pin
• Operating temperature range: -30°C to 85°C

Electrical Compatibility Criteria:

• AC voltage rating must be ≥125V
• AC current rating must be ≥6A
• DC voltage rating must be ≥30V
• DC current rating must be ≥3A

Mechanical Compatibility Criteria:

• Actuator type: Standard Round or equivalent
• Actuator length: 12.70mm ±tolerance acceptable
• Bushing thread: Unthreaded

All substitute parts listed meet these mandatory and electrical compatibility criteria. Variations in actuator length, electrical life cycles, and sealing features represent acceptable trade-offs based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: M2028SA2W03 (NKK Switches)

The M2028SA2W03 is the closest functional equivalent, maintaining NKK Switches manufacturer continuity. It matches the original part's electrical ratings (6A @ 125V AC, 3A @ 30V DC), circuit configuration, and operating temperature range. The actuator length variance (12.28mm vs. 12.70mm) is minimal and acceptable for most through-hole applications. This part is currently active in production, ensuring long-term availability. Electrical life is doubled (50,000 cycles vs. 25,000 cycles), providing enhanced reliability.

Secondary Recommendations for Higher Current Applications:

E205SD1CQE (C&K) provides the highest current rating (7.5A @ 125V AC) and includes IP57 ingress protection, suitable for applications requiring enhanced environmental sealing. Actuator length matches the original specification exactly at 12.70mm.

Alternative Options for Standard Applications:

100DP4T1B4M2QE (E-Switch), 7205SY9CGE (C&K), and U25SY9CQI (C&K) are suitable substitutes where slightly reduced current ratings (5A @ 120V AC) are acceptable. These parts offer extended electrical life (40,000 cycles) and are actively produced. Selection among these three depends on packaging requirements (bulk vs. tray) and specific mechanical constraints.

7205P3Y9CQE (C&K) features a flat anti-rotation actuator, providing mechanical differentiation for applications requiring rotational stability.

All recommended substitutes are ROHS3 compliant and maintain the -30°C to 85°C operating temperature specification.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a lower current rating than the original M2T28SA5W03?

A: No. The substitute must meet or exceed the original electrical specifications: 6A @ 125V AC and 3A @ 30V DC. Using a part with lower ratings creates circuit protection and reliability risks.

Q: Does actuator length variation affect compatibility?

A: Actuator length differences are acceptable within typical mechanical tolerances for through-hole mounted switches. The M2T28SA5W03 specifies 12.70mm; substitutes ranging from 10.41mm to 12.70mm are mechanically compatible for standard panel mounting applications. Verify panel cutout dimensions and actuator clearance for your specific enclosure design.

Q: What is the difference between "Process Sealed" and "Epoxy Sealed Terminals"?

A: Both sealing methods protect internal contacts from environmental contamination. Process sealed refers to manufacturing-stage sealing, while epoxy sealed terminals indicate post-manufacturing terminal protection. Both provide equivalent environmental protection for standard applications. The E205SD1CQE additionally specifies IP57 ingress protection for enhanced waterproofing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements, matching the original M2T28SA5W03 specification.

Q: Why do substitute parts show higher electrical life ratings?

A: Electrical life (measured in switch cycles) represents design improvements in newer production models. The M2T28SA5W03 specifies 25,000 cycles; active substitutes offer 40,000 to 50,000 cycles, indicating enhanced contact durability and extended service life.

Q: Can I substitute the M2T28SA5W03 with a part from a different manufacturer?

A: Yes, provided the substitute meets all mandatory criteria: DPDT circuit, Mom-Off-Mom function, through-hole mounting, PC pin termination, and electrical ratings ≥6A @ 125V AC and ≥3A @ 30V DC. E-Switch and C&K parts listed here meet these requirements.

Q: What packaging options are available for substitute parts?

A: M2028SA2W03 is available in standard packaging. E-Switch 100DP4T1B4M2QE is supplied in bulk packaging. C&K parts are available in bulk (7205P3Y9CQE, 7205SY9CGE) or tray packaging (E205SD1CQE, U25SY9CQI). Verify packaging requirements with your procurement specifications.