NKK Switches E2028 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The NKK Switches E2028 is a panel-mount toggle switch with DPDT (Double Pole Double Throw) circuit configuration, rated for 3A AC at 125V. This component features a momentary-off-momentary (Mom-Off-Mom) switch function with a standard round actuator and solder lug termination. The E2028 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system maintenance and new design implementations where legacy compatibility is required.

Substiute Parts

E2028

NKK SwitchesIn Stock: 1146E2028 Datasheet

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M2028SD3W01

NKK SwitchesIn Stock: 1197M2028SD3W01 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the E2028 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Circuit configuration must be DPDT
• Switch function must be Mom-Off-Mom
• Current rating must support minimum 3A AC
• Voltage rating must support minimum 125V AC
• Mounting type must be Panel Mount
• Actuator type must be Standard Round
• Actuator length must be 10.50mm
• Panel cutout dimensions must be Circular - 6.50mm Dia
• Termination style must be Solder Lug

The M2028SD3W01 meets all critical substitution criteria. While this substitute exhibits enhanced specifications in certain areas (higher current rating, extended temperature range, improved ingress protection, and RoHS3 compliance), these represent functional improvements rather than deviations from the original design envelope. The mechanical interface remains identical, ensuring direct panel-mount compatibility.

Parameter Comparison

Engineering Selection Recommendations

The M2028SD3W01 serves as a direct functional substitute for the E2028 across all critical electrical and mechanical parameters. Both components are classified as obsolete products, indicating that neither is in active production. The M2028SD3W01 provides equivalent performance with measurable improvements in current capacity, temperature operating range, electrical cycle life, and regulatory compliance status.

For applications requiring RoHS3 compliance or operation in extended temperature environments, the M2028SD3W01 is the preferred selection. For applications with no specific compliance requirements and standard operating conditions, both parts are electrically and mechanically interchangeable at the panel-mount interface level.

The identical panel cutout dimensions (6.50mm circular), actuator geometry (10.50mm standard round), and solder lug termination ensure that mechanical redesign of the host assembly is not required when transitioning between these components.

Frequently Asked Questions (FAQ)

Q: Can the M2028SD3W01 directly replace the E2028 in existing designs?

A: Yes. Both components share identical mechanical interfaces (panel cutout, actuator dimensions, termination style) and electrical circuit configuration (DPDT Mom-Off-Mom). No panel modifications or rewiring are required for substitution.

Q: What are the key differences between these two parts?

A: The M2028SD3W01 provides higher AC current capacity (6A versus 3A), extended operating temperature range (-30°C to 85°C versus -10°C to 70°C), increased electrical life (25,000 versus 20,000 cycles), and RoHS3 compliance. The E2028 is RoHS non-compliant.

Q: Are there any electrical compatibility concerns when substituting?

A: No. The M2028SD3W01 meets or exceeds all electrical specifications of the E2028. The 125V AC voltage rating is identical, and the higher current rating of the substitute does not create incompatibility with circuits designed for 3A operation.

Q: What is the significance of the different bushing threads (M6 x 0.75 versus 1/4-40)?

A: The bushing thread specification relates to the panel mounting hardware. While the threads differ, both components maintain the same 6.50mm circular panel cutout diameter, which is the critical mechanical interface parameter. Panel mounting hardware must be selected to match the specific bushing thread of the component being installed.

Q: Why is the M2028SD3W01 listed as obsolete if it offers improvements over the E2028?

A: Product obsolescence is determined by manufacturer production status, not by technical capability. Both components have been discontinued by NKK Switches. Obsolete status indicates that new inventory from the manufacturer is no longer available, though existing stock may remain in distribution channels.

Q: Does the improved ingress protection (IP67) of the M2028SD3W01 affect compatibility?

A: No. Enhanced ingress protection is a functional improvement that does not create incompatibility. Applications that do not require IP67 protection are unaffected by this specification difference.