NKK Switches M2018SS1W01 Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The NKK Switches M2018SS1W01 is a panel-mount toggle switch with SPDT (Single Pole Double Throw) circuit configuration, rated for 6A at 125V AC and 3A at 30V DC. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The switch features a momentary-off-momentary (Mom-Off-Mom) function with epoxy-sealed solder lug terminals and operates across a temperature range of -30°C to 85°C.

Substiute Parts

M2018SS1W01

NKK SwitchesIn Stock: 2331M2018SS1W01 Datasheet

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MN18SS1W01

NKK SwitchesIn Stock: 1000MN18SS1W01 Datasheet

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100SP4T1B1M1QEH

E-SwitchIn Stock: 1360100SP4T1B1M1QEH Datasheet

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100SP4T1B9M1QEH

E-SwitchIn Stock: 1114100SP4T1B9M1QEH Datasheet

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2M1-SP4-T1-B1-M1QE

Carling TechnologiesIn Stock: 13782M1-SP4-T1-B1-M1QE Datasheet

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3-1825137-9

TE Connectivity ALCOSWITCH SwitchesIn Stock: 13223-1825137-9 Datasheet

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5637AB

APEM Inc.In Stock: 12825637AB Datasheet

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7105SCWZQE

C&KIn Stock: 13297105SCWZQE Datasheet

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7105SYZQE

C&KIn Stock: 13947105SYZQE Datasheet

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A127S1YZQ

ElectroswitchIn Stock: 979A127S1YZQ Datasheet

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MTA106G

TE Connectivity ALCOSWITCH SwitchesIn Stock: 1361MTA106G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the M2018SS1W01 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT
• Switch function must be Mom-Off-Mom
• Mounting type must be Panel Mount
• Termination style must be Solder Lug
• Bushing thread must be 1/4-40

Electrical Compatibility Criteria:

• Current rating (AC) must be equal to or greater than 6A
• Voltage rating (AC) must be equal to or greater than 125V
• Voltage rating (DC) must be equal to or greater than 30V
• Operating temperature range must encompass -30°C to 85°C

Mechanical Compatibility Criteria:

• Panel cutout diameter must be compatible with 6.50mm or smaller
• Actuator length must be within acceptable tolerance of 10.50mm
• Actuator type must be Standard Round

Substitute parts meeting all primary criteria and electrical requirements are classified as direct equivalents. Parts meeting primary and most electrical criteria with minor deviations are classified as functional alternatives.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Highest Compatibility):

The 5637AB from APEM Inc. provides the closest electrical and mechanical match to the M2018SS1W01. Both parts share identical current ratings (6A AC), voltage ratings (125V AC, 30V DC), panel cutout diameter (6.50mm), and actuator length (10.50mm). The 5637AB is active in production with ROHS3 compliance and offers superior electrical life (50,000 cycles versus 25,000 cycles). This part is suitable for direct replacement in existing designs.

Primary Alternatives (Functional Compatibility):

The 2M1-SP4-T1-B1-M1QE from Carling Technologies meets all primary compatibility criteria with matching AC voltage rating (125V) and maintains SPDT Mom-Off-Mom configuration. While current rating is reduced to 5A AC, this part is suitable for applications not requiring the full 6A capacity. The part offers enhanced electrical life (50,000 cycles) and IP67 ingress protection.

The A127S1YZQ from Electroswitch matches the 6A AC and 125V AC ratings with superior electrical life (60,000 cycles). This part is suitable for applications where current and voltage requirements align with the original specification.

The MTA106G from TE Connectivity ALCOSWITCH Switches provides 6A AC and 125V AC ratings with 60,000 cycle electrical life. Operating temperature range is -20°C to 80°C, which covers the original -30°C to 85°C range except at the lower extreme.

Secondary Alternatives (Reduced Current Rating):

The 100SP4T1B1M1QEH and 100SP4T1B9M1QEH from E-Switch, along with 7105SCWZQE and 7105SYZQE from C&K, are suitable for applications where 5A AC at 120V AC is acceptable. These parts maintain SPDT Mom-Off-Mom configuration and panel mount compatibility. The 3-1825137-9 from TE Connectivity is functionally compatible but features reduced electrical life (6,000 cycles).

Compliance Considerations:

All substitute parts maintain ROHS3 compliance. The MN18SS1W01 from NKK Switches represents the manufacturer's active replacement for the obsolete M2018SS1W01 and is recommended for new designs requiring NKK brand continuity.

Frequently Asked Questions (FAQ)

Q: Can the 5637AB directly replace the M2018SS1W01 in existing applications?

A: Yes. The 5637AB matches all critical electrical parameters (6A AC, 125V AC, 30V DC) and mechanical specifications (panel cutout 6.50mm, actuator length 10.50mm). Both parts feature SPDT Mom-Off-Mom configuration with solder lug termination and 1/4-40 bushing thread. The 5637AB is the recommended direct equivalent.

Q: What is the difference between the E-Switch 100SP4T1B1M1QEH and 100SP4T1B9M1QEH?

A: Both parts share identical electrical and mechanical specifications. The difference lies in the actuator configuration indicated by the part number suffix (B1 versus B9). Both are functionally equivalent for SPDT Mom-Off-Mom applications at 5A AC and 120V AC.

Q: Why do some substitute parts have lower current ratings than the M2018SS1W01?

A: The M2018SS1W01 is rated for 6A AC, while several alternatives are rated for 5A AC. These parts remain suitable for applications where the actual circuit current does not exceed 5A. Selection should be based on actual application requirements rather than maximum part rating.

Q: Is the MN18SS1W01 from NKK Switches a suitable replacement?

A: The MN18SS1W01 is NKK Switches' active product and represents the manufacturer's recommended replacement for the obsolete M2018SS1W01. However, detailed electrical specifications are not provided in the available data. Verification with NKK Switches is recommended for critical applications.

Q: What is the significance of the panel cutout diameter specification?

A: The panel cutout diameter determines physical compatibility with existing panel installations. The M2018SS1W01 requires a 6.50mm diameter hole. Substitute parts with 6.35mm cutout diameter are mechanically compatible as they require a smaller opening. Parts with larger cutout diameters would require panel modification.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements equivalent to the original M2018SS1W01.

Q: Which substitute part offers the longest electrical life?

A: The A127S1YZQ from Electroswitch and MTA106G from TE Connectivity both offer 60,000 cycle electrical life, compared to 25,000 cycles for the original M2018SS1W01. These parts provide extended service life for high-cycle applications.

Q: Can parts with different operating temperature ranges be used as substitutes?

A: The M2018SS1W01 operates from -30°C to 85°C. Substitute parts must support the full temperature range required by the application. The MTA106G operates from -20°C to 80°C, which may be acceptable for applications not requiring the full lower temperature specification.