Deliver to

United Kingdom



Part Numbers

Top Products


S821D, NKK Switches

S821D NKK Switches
Toggle Switches
NKK Switches

Product Information

The S821D, NKK Switches, is a panel-mount On-Off toggle switch made of durable materials, ensuring reliable and long-lasting switching applications in a broad range of settings. It has 50,000 operations with a long mechanical and electrical life of 10,000 cycles.


Contact Resistance:
Switch Operation:
Actuator Length:
Mounting Type:
Panel Mount
Voltage Rating:
30 V dc, 125V ac
Contact Current Rating:
30 A
Panel Cut Out Diameter:
Contact Configuration:
Panel Cut Out Size:
12.5 (Dia.)mm
Actuator Material:
Chrome Plated Brass
Operating Temperature Range:
-10 → +70°C
Minimum Operating Temperature:
Mechanical Life:
Contact Material:
Maximum Operating Temperature:
Terminal Type:
Standards Met:
CSA Recognised, cULus Recognised, UL Recognised
RoHS Status:
ROHS3 Compliant
Electrical Life:
10,000 Cycles
Termination Style:
Screw Terminal
Voltage Rating - DC:
30 V
Operating Temperature:
-10°C ~ 70°C
Panel Cutout Dimensions:
Circular - 12.50mm Dia
Actuator Length:
REACH Status:
REACH Unaffected
S821D Models
Illumination Type, Color:
Switch Function:
Moisture Sensitivity Level (MSL):
1 (Unlimited)
35 Weeks
Current Rating (Amps):
30A (DC)
Ingress Protection:
Mounting Type:
Panel Mount
Bushing Thread:
M12 x 1
Actuator Type:
Illumination Voltage (Nominal):
Actuator Material:
Brass, Chrome Plated
Base Product Number:
RoHs Compliant
Checking for live stock

The S821D Toggle Switch by NKK Switches is an innovative panel-mount switch designed for various applications. With its screw terminal connection, DPST configuration, and dual voltage rating of 30 V DC and 125 V AC, this switch offers versatility and reliability.

Unique Features and Potential Benefits of S821D, NKK Switches, Toggle Switch Include:

  • Robust Construction: Built with high-quality materials, the S821D Toggle Switch ensures durability and longevity. Its sturdy panel-mount design can withstand demanding environments, making it suitable for industrial, automotive, and consumer electronics applications.
  • Convenient Screw Terminal Connection: The switch features screw terminals that enable easy and secure wiring. This screw terminal provides a reliable electrical connection, preventing accidental disconnections and ensuring consistent performance.
  • Toggle Switch Operation: The On-Off functionality of the S821D switch allows users to control the circuit or device they are connected to easily. The robust toggle mechanism ensures a positive and tactile feel, making switching between the On and Off positions effortless.
  • DPST Configuration: With its Double Pole Single Throw (DPST) configuration, the S821D offers two independent circuits that can be controlled simultaneously. This configuration provides flexibility for various applications, allowing users to control multiple devices or circuits with a single switch.
  • Dual Voltage Rating: The switch is rated for 30 V DC and 125 V AC, making it versatile for different voltage requirements. The switch can reliably handle the specified voltage range, whether used in low-voltage or line-voltage applications.
  • Wide Range of Applications: The switch finds application in numerous industries. It is commonly used in industrial machinery, power supplies, instrumentation, automotive dashboards, consumer electronics, and more. Its versatility and robustness make it an ideal choice for diverse projects.
  • Reliable Performance: NKK Switches is renowned for producing high-quality switches, and the S821D is no exception. This toggle switch undergoes rigorous testing and meets stringent quality standards, ensuring its reliability and consistent performance.
  • Easy Installation: The panel-mount design of the S821D toggle switch simplifies installation. It can be securely mounted on various panels, cabinets, or control boards, providing a professional and neat appearance.
  • Enhanced Safety Features: The Toggle Switch incorporates safety features to protect against accidental operation. Its sturdy toggle guard prevents unintended switching, reducing the risk of disrupting critical systems or causing potential hazards.
  • Compact and Space-Saving: The S821D is designed with compact dimensions, making it suitable for applications with limited space. Its small footprint allows for efficient use of panel or enclosure real estate.
  • Easy Identification: The switch features a clear and visible On-Off marking, ensuring easy identification of the switch position. This visual indication simplifies operation and minimizes the chances of accidental misuse.
  • Environmental Resistance: The bespoke product is engineered to withstand challenging environments. It offers resistance to dust, moisture, and vibration, ensuring reliable operation even in harsh conditions.



pdf icon
Series S_Datasheet_EN(Technical Reference)
pdf icon
S Series Toggle High Cap Datasheet(Datasheets)
pdf icon
RoHS Cert - Switches & Pushbuttons(Environmental Information)
pdf icon
NKK Switches PFOS & PFOA Free Cert(Environmental Information)
pdf icon
NKK Switches ODC Cert(Environmental Information)


  • Be the first to review.
Don’t hesitate to ask questions for better clarification.

Alternative products


Yes. You can also search S821D on website for other similar products.
We accept all major payment methods for all products including ET12265143. Please check your shopping cart at the time of order.
You can order NKK Switches brand products with S821D directly through our website or call us at +44 (0) 3303 800 157 or email our support team at sales@enrgtech.co.uk.
Yes. Our products in Toggle Switches category are shipped in lowest possible time.
You will get a confirmation email regarding your order of NKK Switches S821D. You can also check on our website or by contacting our customer support team for further order details on NKK Switches S821D.
We use our internationally recognized delivery partners UPS/DHL. Collection of ET12265143 can also be arranged for the customer by international shipments through contacting our customer support team. Additionally, you can also search "NKK Switches" products on our website by using Enrgtech's Unique Manufacturing Part Number ET12265143.
Yes. We ship S821D Internationally to many countries around the world.