M2038SS1W01 Toggle Switch 3PDT Equivalent & Substitute Parts

Part Overview

The NKK Switches M2038SS1W01 is a panel-mount toggle switch with 3PDT (three-pole, double-throw) configuration rated for 6A at 125V AC and 3A at 30V DC. The switch features a momentary-off-momentary (Mom-Off-Mom) function with solder lug termination and epoxy-sealed terminals. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	M2038SS1W01
Manufacturer	NKK Switches
Circuit Configuration	3PDT
Switch Function	Mom-Off-Mom
Current Rating (AC)	6A @ 125V
Current Rating (DC)	3A @ 30V
Mounting Type	Panel Mount
Actuator Type	Standard Round
Actuator Length	10.50mm
Panel Cutout Diameter	6.50mm
Bushing Thread	1/4-40
Termination Style	Solder Lug
Operating Temperature Range	-30°C to 85°C
Electrical Life	25,000 Cycles
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the M2038SS1W01 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Circuit configuration: 3PDT
Switch function: Mom-Off-Mom
Mounting type: Panel Mount
Termination style: Solder Lug
Bushing thread: 1/4-40
Panel cutout diameter: 6.35mm or 6.50mm (within mechanical tolerance)
Operating temperature range: -30°C to 85°C minimum

Electrical Performance Parameters:

Current rating: Must support minimum 6A AC at 125V or equivalent DC rating
Voltage rating: Must support minimum 125V AC or 30V DC
Electrical life: 25,000 cycles minimum

Compliance Parameters:

RoHS3 compliance required
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories based on electrical performance:

Category A - Full Electrical Equivalents (6A/5A @ 120-125V AC): Parts meeting or exceeding the original electrical specifications with active product status and enhanced electrical life (40,000 cycles).

Category B - Reduced Electrical Rating Substitutes (0.4VA @ 20V AC/DC): Parts with lower electrical ratings suitable only for applications with reduced power requirements. These parts maintain mechanical and functional compatibility but operate at significantly lower voltage and current levels.

Parameter Comparison

Part Number	Manufacturer	Circuit	Current Rating	Voltage Rating (AC)	Voltage Rating (DC)	Actuator Type	Actuator Length (mm)	Panel Cutout (mm)	Electrical Life (Cycles)	Product Status	RoHS Status
M2038SS1W01	NKK Switches	3PDT	6A (AC), 3A (DC)	125V	30V	Standard Round	10.50	6.50	25,000	Obsolete	ROHS3
1003P4T1B1M1QEH	E-Switch	3PDT	5A (AC/DC)	120V	28V	Standard Round	10.41	6.35	40,000	Active	ROHS3
7305P3HZBE	C&K	3PDT	0.4VA (AC/DC)	20V	20V	Flat Anti-Rotation	11.43	6.35	40,000	Active	ROHS3
7305P3YZBE	C&K	3PDT	0.4VA (AC/DC)	20V	20V	Flat Anti-Rotation	11.43	6.35	40,000	Active	ROHS3
7305P3YZQE2	C&K	3PDT	5A (AC/DC)	120V	28V	Flat Anti-Rotation	11.43	6.35	40,000	Active	ROHS3
7305SCWZBE	C&K	3PDT	0.4VA (AC/DC)	20V	20V	Standard Round	10.67	6.35	40,000	Active	ROHS3
7305SCWZGE	C&K	3PDT	5A (AC/DC)	120V	28V	Standard Round	10.67	6.35	40,000	Active	ROHS3
7305SCWZQE	C&K	3PDT	5A (AC/DC)	120V	28V	Standard Round	10.67	6.35	40,000	Active	ROHS3
7305SPYZBE	C&K	3PDT	0.4VA (AC/DC)	20V	20V	Anti-Rotation	10.67	6.35	40,000	Active	ROHS3
7305SYZBE	C&K	3PDT	0.4VA (AC/DC)	20V	20V	Standard Round	10.67	6.35	40,000	Active	ROHS3
7305SYZQE	C&K	3PDT	5A (AC/DC)	120V	28V	Standard Round	10.67	6.35	40,000	Active	ROHS3

Engineering Selection Recommendations

Primary Substitute - Full Electrical Equivalence:

The E-Switch 1003P4T1B1M1QEH is the recommended primary substitute. It maintains 3PDT Mom-Off-Mom configuration with 5A AC at 120V and 28V DC ratings, meeting the original specifications. The part is active in production status with ROHS3 compliance and extended electrical life of 40,000 cycles. Actuator length of 10.41mm and panel cutout of 6.35mm are within mechanical tolerance of the original 10.50mm and 6.50mm dimensions.

Secondary Substitutes - Full Electrical Equivalence with Enhanced Features:

C&K parts 7305P3YZQE2, 7305SCWZGE, 7305SCWZQE, and 7305SYZQE provide equivalent electrical performance at 5A AC/120V DC/28V. These parts are active in production with ROHS3 compliance and 40,000-cycle electrical life. Mechanical differences include:

7305P3YZQE2: Flat anti-rotation actuator, 11.43mm length
7305SCWZGE and 7305SCWZQE: Standard round actuator with IP67 ingress protection, 10.67mm length
7305SYZQE: Standard round actuator, 10.67mm length

Reduced-Rating Substitutes - Conditional Use Only:

C&K parts 7305P3HZBE, 7305P3YZBE, 7305SCWZBE, 7305SPYZBE, and 7305SYZBE operate at 0.4VA at 20V AC/DC. These parts are suitable only for applications with significantly reduced power requirements and cannot replace the M2038SS1W01 in circuits requiring 6A at 125V. All reduced-rating parts are active in production with ROHS3 compliance and 40,000-cycle electrical life.

All substitute parts maintain the required 3PDT Mom-Off-Mom configuration, solder lug termination, 1/4-40 bushing thread, and -30°C to 85°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can the M2038SS1W01 be directly replaced with any of the listed substitutes?

A: Direct replacement depends on application electrical requirements. The E-Switch 1003P4T1B1M1QEH and C&K 7305P3YZQE2, 7305SCWZGE, 7305SCWZQE, and 7305SYZQE provide full electrical equivalence at 5A/120V AC. Reduced-rating parts (0.4VA/20V) are compatible only in low-power applications.

Q: What are the mechanical compatibility considerations?

A: All substitutes maintain the 1/4-40 bushing thread and panel cutout diameter of 6.35mm (original is 6.50mm, within tolerance). Actuator lengths vary from 10.41mm to 11.43mm compared to the original 10.50mm. Verify panel depth and actuator clearance in your specific application.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited).

Q: What is the difference between the C&K 7305 series variants?

A: C&K 7305 series parts differ by base model (7305P3, 7305SC, 7305SP, 7305SY), which determines actuator type and ingress protection. 7305SC variants include IP67 dust-tight and waterproof protection. Electrical ratings vary between 0.4VA/20V and 5A/120V depending on specific part number suffix.

Q: Why does the original M2038SS1W01 have lower electrical life (25,000 cycles) than substitutes?

A: The M2038SS1W01 is an obsolete part. All active substitute parts feature improved design with 40,000-cycle electrical life, providing enhanced reliability and extended service life.

Q: Can I use a reduced-rating substitute (0.4VA/20V) in place of the original 6A/125V part?

A: No. Reduced-rating substitutes are electrically incompatible with applications requiring 6A at 125V. Use only if your application operates at 20V or lower with current requirements below 0.4A.

Q: What is the difference between standard round and anti-rotation actuators?

A: Standard round actuators rotate freely. Anti-rotation actuators include mechanical features preventing rotation. Selection depends on application requirements for actuator stability and user interface design.

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