NKK Switches M2042SS2W40 Equivalent & Substitute Parts

Part Overview

The NKK Switches M2042SS2W40 is a 4PDT toggle switch rated for 6A at 125V AC and 4A at 30V DC. This through-hole, right-angle vertical mounted switch features epoxy sealed terminals and a standard round actuator with 10.50mm length. The product is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations where this switch type is required.

Substiute Parts

M2042SS2W40

NKK SwitchesIn Stock: 997M2042SS2W40 Datasheet

Current PartRFQ

A423S1D9AV2Q

ElectroswitchIn Stock: 890A423S1D9AV2Q Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the M2042SS2W40 is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4PDT topology required
• Switch function: On-On operation
• Current rating: Minimum 6A AC capability
• Voltage rating: Minimum 125V AC and 30V DC
• Mounting configuration: Through hole, right angle, vertical orientation
• Actuator type: Standard round actuator
• Termination style: PC pin connections
• Panel cutout compatibility: Circular 6.50mm diameter

The Electroswitch A423S1D9AV2Q meets these substitution criteria with equivalent electrical and mechanical specifications, enabling direct functional replacement in applications requiring this switch category.

Parameter Comparison

Engineering Selection Recommendations

The Electroswitch A423S1D9AV2Q is qualified as a direct substitute for the obsolete NKK Switches M2042SS2W40. Both components meet the same electrical specifications for 4PDT switching at 6A/125V AC operation. The substitute part offers extended electrical life (60,000 cycles versus 25,000 cycles) and an expanded operating temperature range (-30°C to 90°C versus -30°C to 85°C). Both parts maintain RoHS compliance and identical termination and mounting configurations. The A423S1D9AV2Q is currently in active production status, ensuring long-term availability for replacement and new applications.

Frequently Asked Questions (FAQ)

Q: Can the A423S1D9AV2Q replace the M2042SS2W40 in existing designs?

A: Yes. Both switches share identical 4PDT circuit configuration, 6A/125V AC ratings, through-hole right-angle vertical mounting, PC pin termination, and standard round actuator type. The substitute part meets all functional and mechanical requirements for direct replacement.

Q: What are the differences in DC voltage rating between these parts?

A: The M2042SS2W40 is rated for 30V DC, while the A423S1D9AV2Q is rated for 28V DC. For applications operating at or below 28V DC, both parts are equivalent. Applications requiring operation above 28V DC must use the original M2042SS2W40 specification.

Q: Does the 0.09mm difference in actuator length affect compatibility?

A: The M2042SS2W40 has a 10.50mm actuator length and the A423S1D9AV2Q has a 10.41mm actuator length. This 0.09mm difference is within typical mechanical tolerance for panel-mounted toggle switches and does not affect functional compatibility or panel cutout fit.

Q: Are there packaging differences between these parts?

A: The M2042SS2W40 is supplied in standard packaging, while the A423S1D9AV2Q is supplied in bulk packaging. Both are suitable for component selection; packaging choice depends on order quantity and inventory management requirements.

Q: Why does the substitute part have longer electrical life?

A: The A423S1D9AV2Q is rated for 60,000 electrical cycles compared to 25,000 cycles for the M2042SS2W40. This extended life specification reflects the active production status and current design standards of the Electroswitch component.