MS12ASW40 Equivalent & Substitute Parts

Part Overview

The MS12ASW40 is a slide switch manufactured by NKK Switches, featuring SPDT (Single Pole Double Throw) configuration with 6A AC rating at 125V. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The switch is designed for through-hole, right-angle vertical mounting applications with non-shorting contact timing and silver alloy contacts rated for 100,000 mechanical cycles and 25,000 electrical cycles.

Substiute Parts

MS12ASW40

NKK SwitchesIn Stock: 1103MS12ASW40 Datasheet

Current PartRFQ

MSN12ASW40

NKK SwitchesIn Stock: 1140MSN12ASW40 Datasheet

MFR RecommendedRFQ

48ASSP1S1M7QAT

Grayhill Inc.In Stock: 76748ASSP1S1M7QAT Datasheet

SimilarRFQ

48ASSP1S1M7QBT

Grayhill Inc.In Stock: 103248ASSP1S1M7QBT Datasheet

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48ASSP1S1M7RAT

Grayhill Inc.In Stock: 107248ASSP1S1M7RAT Datasheet

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48ASSP1S1M7RBT

Grayhill Inc.In Stock: 88048ASSP1S1M7RBT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MS12ASW40 is determined by the following critical parameters:

Primary Substitution Criteria:

• Circuit configuration (SPDT)
• Switch function (On-On)
• Contact timing (Non-Shorting preferred)
• Mounting type (Through Hole, Right Angle, Vertical)
• Termination style (PC Pin)
• Operating temperature range (-30°C to 85°C)
• RoHS compliance status

Electrical Compatibility Criteria:

• Current rating must meet or exceed 6A AC
• Voltage rating must meet or exceed 125V AC
• Contact material and finish must support equivalent electrical performance

The substitute parts are grouped into two categories:

Category 1 - Direct Manufacturer Substitute (Recommended): MSN12ASW40 from NKK Switches represents the manufacturer's direct replacement, maintaining the same design lineage and performance characteristics.

Category 2 - Cross-Manufacturer Equivalents: Grayhill Inc. 48A series parts (48ASSP1S1M7QAT, 48ASSP1S1M7QBT, 48ASSP1S1M7RAT, 48ASSP1S1M7RBT) provide functional equivalence with SPDT configuration, On-On switching, and compatible mounting specifications. These parts differ in current and voltage ratings, requiring application-specific evaluation.

Parameter Comparison

Engineering Selection Recommendations

MSN12ASW40 (NKK Switches) is the primary recommended substitute. As an active product from the original manufacturer, it maintains design continuity with the MS12ASW40 and carries ROHS3 compliance certification. This part is suitable for direct replacement in applications requiring the original electrical and mechanical specifications.

48ASSP1S1M7QBT (Grayhill Inc.) is the secondary recommended substitute for through-hole mounting applications. This part meets the mounting type requirement (Through Hole, Right Angle, Vertical), maintains SPDT On-On configuration, and achieves 125V AC rating. The 5A AC/DC current rating is lower than the original 6A specification and must be evaluated against application requirements. ROHS3 compliance is confirmed.

48ASSP1S1M7QAT (Grayhill Inc.) provides equivalent electrical ratings (5A AC/DC, 125V AC) but requires panel mount installation, differing from the original through-hole mounting. This part is suitable only for applications where panel mounting is acceptable.

48ASSP1S1M7RAT and 48ASSP1S1M7RBT (Grayhill Inc.) feature reduced electrical ratings (0.4VA, 20V AC/DC) and are suitable only for low-voltage, low-current applications. These parts are not recommended for applications requiring the original 6A/125V specifications.

Frequently Asked Questions (FAQ)

Q: Can MSN12ASW40 be used as a direct replacement for MS12ASW40? A: MSN12ASW40 is the manufacturer-recommended substitute from NKK Switches. As an active product maintaining the same design lineage, it is suitable for direct replacement in applications matching the original electrical and mechanical requirements.

Q: What are the key differences between MS12ASW40 and Grayhill 48A series substitutes? A: The primary differences are manufacturer origin, contact material composition (silver alloy versus copper alloy), and in some cases, electrical ratings. All maintain SPDT On-On configuration and compatible mounting specifications. Grayhill parts with 5A ratings are suitable for applications not requiring the full 6A capacity of the original part.

Q: Is 48ASSP1S1M7QBT compatible with through-hole mounting applications? A: Yes. 48ASSP1S1M7QBT is specified for Through Hole, Right Angle, Vertical mounting, matching the original MS12ASW40 mounting type. The 5A AC/DC current rating must be confirmed as acceptable for the application.

Q: Why do 48ASSP1S1M7RAT and 48ASSP1S1M7RBT have lower electrical ratings? A: These parts feature gold-plated contacts and are designed for low-voltage, low-current signal switching applications (0.4VA, 20V). They are not suitable for applications requiring 6A/125V operation.

Q: Are all substitute parts RoHS compliant? A: All substitute parts carry RoHS compliance certification. MSN12ASW40, 48ASSP1S1M7QAT, 48ASSP1S1M7QBT, and 48ASSP1S1M7RBT are ROHS3 compliant. 48ASSP1S1M7RAT carries RoHS compliance certification.

Q: What is the difference between panel mount and through-hole mounting in these switches? A: Through-hole mounting (MS12ASW40, 48ASSP1S1M7QBT, 48ASSP1S1M7RBT) uses PC pins inserted into PCB holes for permanent installation. Panel mount (48ASSP1S1M7QAT, 48ASSP1S1M7RAT) uses a different mechanical interface for mounting to enclosure panels. Application PCB design determines which mounting type is required.

Q: What is the significance of contact material differences? A: MS12ASW40 uses silver alloy contacts, while Grayhill 48A series parts use copper alloy contacts with either silver or gold finish. Contact material affects electrical performance, corrosion resistance, and cost. Both materials are suitable for the specified operating temperature range and environmental conditions.