M2018SS1G01 Equivalent & Substitute Parts

Part Overview

The M2018SS1G01 is a toggle switch SPDT panel mount component manufactured by NKK Switches. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The switch is rated for 0.4VA at 28V AC/DC with a momentary-off-momentary (Mom-Off-Mom) switching function, featuring epoxy sealed terminals and a 1/4-40 bushing thread for panel mounting.

Key Parameters

Parameter	M2018SS1G01
Manufacturer	NKK Switches
Circuit Configuration	SPDT
Switch Function	Mom-Off-Mom
Current Rating	0.4VA (AC/DC)
Voltage Rating - AC	28V
Voltage Rating - DC	28V
Mounting Type	Panel Mount
Actuator Type	Standard Round
Termination Style	Solder Lug
Panel Cutout Dimensions	Circular - 6.50mm Dia
Bushing Thread	1/4-40
Operating Temperature Range	-30°C ~ 85°C
Electrical Life	50,000 Cycles
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the M2018SS1G01 is determined by the following critical parameters:

Circuit configuration must be SPDT
Switch function must be Mom-Off-Mom
Voltage rating must support minimum 28V DC operation
Current rating must support minimum 0.4VA
Mounting type must be Panel Mount with 1/4-40 bushing thread
Termination style must be Solder Lug
Operating temperature range must encompass -30°C to 85°C

The substitute parts listed below meet these core electrical and mechanical requirements. Variations in panel cutout dimensions, actuator length, and electrical life do not preclude substitution when the primary functional parameters align.

Parameter Comparison

Parameter	M2018SS1G01 (NKK)	7105SYZBE (C&K)	7105P3HZQE (C&K)	7105P3HZGE (C&K)	A127S1YZB (Electroswitch)
Circuit Configuration	SPDT	SPDT	SPDT	SPDT	SPDT
Switch Function	Mom-Off-Mom	Mom-Off-Mom	Mom-Off-Mom	Mom-Off-Mom	Mom-Off-Mom
Current Rating	0.4VA (AC/DC)	0.4VA (AC/DC)	5A (AC/DC)	5A (AC/DC)	0.5VA (AC/DC)
Voltage Rating - AC	28V	20V	120V	120V	28V
Voltage Rating - DC	28V	20V	28V	28V	28V
Mounting Type	Panel Mount	Panel Mount	Panel Mount	Panel Mount	Panel Mount
Actuator Type	Standard Round	Standard Round	Flat Anti-Rotation	Flat Anti-Rotation	Standard Round
Termination Style	Solder Lug	Solder Lug	Solder Lug	Solder Lug	Solder Lug
Bushing Thread	1/4-40	1/4-40	1/4-40	1/4-40	1/4-40
Operating Temperature Range	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 85°C	-30°C ~ 90°C
Electrical Life	50,000 Cycles	40,000 Cycles	40,000 Cycles	40,000 Cycles	60,000 Cycles
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

7105SYZBE (C&K): This substitute matches the M2018SS1G01 in current rating (0.4VA), actuator type (Standard Round), and operating temperature range. However, the AC voltage rating is 20V, which is below the 28V requirement of the original part. This part is ROHS3 compliant and active in production. Selection of this part requires confirmation that 20V AC operation is acceptable for the application.

7105P3HZGE (C&K): This substitute provides higher current capacity (5A) and AC voltage rating (120V), exceeding the original part specifications. It maintains 28V DC rating, SPDT configuration, and Mom-Off-Mom function. The part is ROHS3 compliant and active in production. The flat anti-rotation actuator differs from the standard round actuator of the original part.

7105P3HZQE (C&K): This substitute is electrically equivalent to 7105P3HZGE with identical ratings and specifications. However, this part is RoHS non-compliant, which may restrict its use in regulated applications or future procurement scenarios.

A127S1YZB (Electroswitch): This substitute closely matches the M2018SS1G01 with 0.5VA current rating, 28V AC/DC voltage rating, and standard round actuator. It offers extended electrical life (60,000 cycles versus 50,000 cycles) and an expanded operating temperature range (-30°C to 90°C). The part is RoHS compliant and active in production.

Frequently Asked Questions (FAQ)

Q: Can the 7105SYZBE substitute for the M2018SS1G01 in all applications?

A: The 7105SYZBE meets most functional requirements but has a reduced AC voltage rating of 20V compared to the original 28V specification. Substitution is valid only if the application operates at or below 20V AC.

Q: What is the primary difference between 7105P3HZGE and 7105P3HZQE?

A: Both parts are electrically and mechanically identical. The distinction is RoHS compliance status: 7105P3HZGE is ROHS3 compliant, while 7105P3HZQE is RoHS non-compliant. Selection depends on regulatory requirements for the end application.

Q: Is the A127S1YZB a direct replacement for the M2018SS1G01?

A: The A127S1YZB is functionally compatible with the M2018SS1G01. Both parts share SPDT configuration, Mom-Off-Mom function, 28V ratings, standard round actuator, and solder lug termination. The A127S1YZB offers improved electrical life and extended temperature range.

Q: Why do the C&K 7105P3 series parts have higher current ratings than the original?

A: The 7105P3HZGE and 7105P3HZQE are rated for 5A, which exceeds the 0.4VA requirement of the M2018SS1G01. Higher current capacity does not prevent substitution; these parts remain compatible with circuits designed for 0.4VA operation.

Q: Are there panel cutout dimension differences that affect installation?

A: The M2018SS1G01 requires a 6.50mm diameter circular cutout, while the C&K 7105 series parts require 6.35mm. The A127S1YZB does not specify panel cutout dimensions. Verify panel hole sizing before installation to ensure proper fit.

Q: Which substitute part offers the best compliance profile?

A: The A127S1YZB and 7105P3HZGE are both RoHS compliant and active in production. The A127S1YZB additionally provides extended electrical life and temperature range, making it suitable for applications with stringent compliance requirements.

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