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MK04 Series Reed Sensor

Description

Best value screw fastened flange mount MK04 Series Reed Sensor in a rectangular housing with cable terminals. Used in position, proximity, motion, level, and end limit sensing. Optional internal switch, cable, length, and termination. UL Approval

UL Certificate of Compliance (MKxxU *Series followed by U)

Specifications

Contact Form1A (SPST) Normally Open (N.O.), 1B (SPST) Normally Closed (N.C.), 1C (SPDT) Changeover
Operating Range10-60 AT
Rated Power Max.10W/400VDC/0.5A

Applications

Industrial, security, white goods

Series Data Sheet (PDF)
 
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Stock Check

Item No.DatasheetDistributorRegionQuantityCartRFQInventory Date
MK04-1A66B-500W MASTER/ONLINEAmericas6,460 BUY RFQ2024-12-10
MK04-1C90C-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04-1B90C-500W MASTER/ONLINEAmericas1,784 BUY RFQ2024-12-10
MK04-1A81A-500WRelay Specialties, IncAmericas37 RFQ2023-01-23
MK04-1A66A-500WRelay Specialties, IncAmericas3 RFQ2023-01-23
MK04-1A66B-500W Reed-Rex LLCAmericas85 RFQ2024-09-04
MK04-1B90C-500W Reed-Rex LLCAmericas400 RFQ2024-09-04
MK04R-1A66C-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04R-1A66B-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04R-1B90C-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04R-1A66D-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04R-1C90C-500W MASTER/ONLINEAmericas0 RFQ2024-12-10
MK04-1A66B-200WMASTER/ONLINEAmericas0 RFQ2024-12-10
MK04-BV51427Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1A66C-1000W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1A66C-500W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1B90C-1000W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1B90C-500W Heilind ElectronicsAmericas390 BUY RFQ2024-12-07
MK04-1B90C-BV16904Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1C90C-500W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1A66B-5000W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1A66B-500W Heilind ElectronicsAmericas4,800 BUY RFQ2024-12-07
MK04-1A66B-3000W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04-1A66B-1000W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04R-1C90C-500W Digi-Key ElectronicsAmericas399 BUY RFQ2024-12-08
MK04R-1B90C-500W Digi-Key ElectronicsAmericas400 BUY RFQ2024-12-08
MK04-1A66C-500W Digi-Key ElectronicsAmericas0 RFQ2024-12-08
MK04-1B90C-500W Digi-Key ElectronicsAmericas5,300 BUY RFQ2024-12-08
MK04R-1A66B-500W Digi-Key ElectronicsAmericas387 BUY RFQ2024-12-08
MK04-1A66B-500W Digi-Key ElectronicsAmericas12,897 BUY RFQ2024-12-08
MK04R-1A66D-500W Digi-Key ElectronicsAmericas398 BUY RFQ2024-12-08
MK04R-1A66C-500W Digi-Key ElectronicsAmericas399 BUY RFQ2024-12-08
MK04-1A66D-500W Digi-Key ElectronicsAmericas608 BUY RFQ2024-12-08
MK04-1C90C-500W Digi-Key ElectronicsAmericas418 BUY RFQ2024-12-08
MK04-1A66D-500W MASTER/ONLINEAmericas800 BUY RFQ2024-12-10
MK04-1A66C-500W MASTER/ONLINEAmericas438 BUY RFQ2024-12-10
MK04-1A66B-500W Heilind ElectronicsAmericas0 RFQ2024-12-07
MK04Standex FactoryAmericas0 RFQ2024-12-10
MK04-1A66D-500W Mouser ElectronicsAmericas780 BUY RFQ2024-12-10
MK04-1B90E-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66C-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66B-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66E-500W Mouser ElectronicsAmericas1,334 BUY RFQ2024-12-10
MK04-1B90C-500W Mouser ElectronicsAmericas1,463 BUY RFQ2024-12-10
MK04-1C90C-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A75B-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1C90D-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1C90E-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66B-500W Mouser ElectronicsAmericas2,889 BUY RFQ2024-12-10
MK04-1C90C-500W Mouser ElectronicsAmericas395 BUY RFQ2024-12-10
MK04-1A66B-1000W Mouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66C-500W Mouser ElectronicsAmericas1,041 BUY RFQ2024-12-10
MK04-1A66E-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1B90C-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66D-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1B90D-300WMouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66C-2000W Mouser ElectronicsAmericas0 RFQ2024-12-10
MK04-1A66B-4000W Mouser ElectronicsAmericas0 RFQ2024-12-10
MK04R-1A66C-500W Mouser ElectronicsAmericas399 BUY RFQ2024-12-10
MK04R-1A66B-500W Mouser ElectronicsAmericas776 BUY RFQ2024-12-10
MK04R-1A66D-500W Mouser ElectronicsAmericas399 BUY RFQ2024-12-10
MK04R-1C90C-500W Mouser ElectronicsAmericas395 BUY RFQ2024-12-10
MK04-1C90C-1250WMouser ElectronicsAmericas66 BUY RFQ2024-12-10
MK04R-1B90C-500W Mouser ElectronicsAmericas400 BUY RFQ2024-12-10
MK04R-1A66B-500W Arrow ElectronicsAmericas400 BUY RFQ2024-12-10

Parametric Search

Mounting StyleContact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentLength OverallSize BodyTermination
Part Number Mounting StyleContact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentLength OverallSize BodyTerminationPackaging
MK04-1A66B-1000WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A40.28" (1023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-2000WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A79.65" (2023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-2500WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A99.33" (2523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-3000WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A119.02" (3023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-4000WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A158.39" (4023mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-5000WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A197.76" (5023mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-500WScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66B-500ZScrew FlangeSPST-NO23 ~ 44 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-1000WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A40.28" (1023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-1500WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A59.96" (1523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-2000WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A79.65" (2023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-3000WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A119.02" (3023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-5000WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A197.76" (5023mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-500VScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66C-500WScrew FlangeSPST-NO33 ~ 53 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66D-500WScrew FlangeSPST-NO44 ~ 64 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66E-3000WScrew FlangeSPST-NO57 ~ 75 AT10 W180 V0.5 A119.02" (3023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66E-500WScrew FlangeSPST-NO57 ~ 75 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A66F-500WScrew FlangeSPST-NO62 ~ 85 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A75B-500WScrew FlangeSPST-NO23 ~ 44 AT10 W500 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1A75C-1000WScrew FlangeSPST-NO33 ~ 53 AT10 W500 V0.5 A40.28" (1023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-1B90C-1000WScrew FlangeSPST-NC43 ~ 64 AT10 W175 V0.5 A40.28" (1023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90C-2000WScrew FlangeSPST-NC43 ~ 64 AT10 W175 V0.5 A79.65" (2023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90C-3000WScrew FlangeSPST-NC43 ~ 64 AT10 W175 V0.5 A119.02" (3023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90C-4000WScrew FlangeSPST-NC43 ~ 64 AT10 W175 V0.5 A158.39" (4023mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90C-500WScrew FlangeSPST-NC43 ~ 64 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90D-500WScrew FlangeSPST-NC48 ~ 70 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1B90E-500WScrew FlangeSPST-NC56 ~ 78 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1C90B-1000WScrew FlangeSPDT29 ~ 60 AT10 W175 V0.5 A40.28" (1023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1C90C-2000WScrew FlangeSPDT42 ~ 64 AT10 W175 V0.5 A79.65" (2023.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1C90C-5000WScrew FlangeSPDT42 ~ 64 AT10 W175 V0.5 A197.76" (5023mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1C90C-500WScrew FlangeSPDT42 ~ 64 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-1C90D-500WScrew FlangeSPDT48 ~ 70 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04-KITScrew FlangeSPST-NO23 ~ 66 AT20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04-SetScrew FlangeSPST-NO23 ~ 44 AT20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04R-1A66B-500WScrew Flange Right Cable ExitSPST-NO23 ~ 44 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04R-1A66C-500WScrew Flange Right Cable ExitSPST-NO33 ~ 53 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04R-1A66D-500WScrew Flange Right Cable ExitSPST-NO44 ~ 64 AT10 W180 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk
MK04R-1B90C-500WScrew Flange Right Cable ExitSPST-NC43 ~ 64 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04R-1C90C-500WScrew Flange Right Cable ExitSPDT42 ~ 64 AT10 W175 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, RoundBulk
MK04U-1B90C-500WScrew FlangeSPST-NC43 ~ 64 AT10 W200 V0.5 A20.59" (523.0mm)0.910" L x 0.550" W x 0.230" H (23.00mm x 13.90mm x 5.90mm)Cable, FlatBulk

Associated Parts

Ferrous metal detection screw fastened flange mount MK02 Series Reed Sensor in a rectangular housing with cable terminals. Front or above operation. UL Approval, IP67 Rated

UL Certificate of Compliance (MKxx/xU *Series followed by U)

Best value screw fastened flange mount MK05 Series Reed Sensor in a rectangular housing with cable terminals. Used in position, proximity, motion, level, and end limit sensing. Optional internal switch, cable, length, and termination. UL Approval

UL Certificate of Compliance (MKxxU *Series followed by U)

Best value screw fastened flange mount MK13 Series Reed Sensor in a rectangular housing with cable terminals. Used in position, proximity, motion, level, and end limit sensing. Optional internal switch, cable, length, and termination. UL Approval

UL Certificate of Compliance (MKxxU *Series followed by U)

High temperature resistant screw fastened flange mount MK21P, MK21M Series Reed Sensor in a rectangular housing with cable terminals. Used in position, level, and end limit sensing. Molded (M) version for high temperature resistance up to +150°C. Optional internal switch, cable, length, and termination. UL Approval, IP67 Rated

UL Certificate of Compliance (MKxxU *Series followed by U)

High voltage screw fastened flange mount MK26 Series Reed Sensor in a rectangular housing with cable terminals. Used in position, proximity, motion, level, and end limit sensing. Optional internal switch, cable, length, and termination. IP67 Rated

High voltage aluminum screw fastened flange mount MK27 Series Reed Sensor in a rectangular housing with cable terminals. Ideal in harsh environments for proximity, position, motion, and end limit detection. Sensing distance up to 40mm, magnet included. Optional internal switch, cable, length, and termination. IP67 Rated

Magnetically conductive vane operated screw fastened MK28 Series Reed Sensor with cable terminals is ideal in harsh environments.

Technical Papers

Datasheets
Datasheet – MK33 Series Reed SwitchesDatasheet – MK21PR Series Reed SensorsDatasheet – MK04R Series Reed SensorsDatasheet – MK31 Series Reed SensorsDatasheet – MK10 Series Reed SensorsDatasheet – Magnet in Housing – M02, M03, M04, M05, M06, M11, M12, M13 and M21Datasheet – MK21 Series Reed SensorDatasheet – M21P Series Magnet in HousingDatasheet – M13 Series Magnet in HousingDatasheet – M11B Series Magnet in HousingDatasheet – M02 Series Magnet in HousingDatasheet – MK25 Series Reed SensorDatasheet – MK08 Series Reed SensorDatasheet – MK07 Series Reed SensorDatasheet – MK11 Brass Series Reed SensorDatasheet – MK11 Plastic Series Reed SensorDatasheet – MK11 Stainless Steel Series Reed SensorDatasheet – MK03 Series Reed SensorDatasheet – MK14 Series Reed SensorDatasheet – MK18 Series Reed SensorDatasheet – MK20/1 Series Reed SensorDatasheet – MK20/2 Series Reed SensorDatasheet – MK27 Series Reed SensorDatasheet – MK26 Series Reed SensorDatasheet – MK13 Series Reed SensorDatasheet – MK05 Series Reed SensorDatasheet – MK04 Series Reed SensorDatasheet – MK28 Series Reed SensorDatasheet – MK02 Series Reed SensorDatasheet – MK02/6 Series Reed SensorDatasheet – MK06 Series Reed SensorDatasheet – MK30 Series Reed SensorDatasheet – MK01 Series Reed SensorDatasheet – MK15 Series Reed SensorDatasheet – MK22 Series Reed SensorDatasheet – MK16 Series Reed SensorDatasheet – MK17 Series Reed SensorDatasheet – MK10 Series Reed SensorDatasheet – MK23 Series Reed SensorDatasheet – MK24 Series Reed Sensor

Applications

Media

Reed Switches for Smart Home Automation Systems

Reed Switches work well with smart home automation systems because they draw no power compared to other magnetic sensing elements. They can be married to a wireless or Bluetooth technology and placed in remote battery powered door sensors or window sensors, or anything where you’re looking for movement or proximity. They’re a very cost-effective and robust component suitable for the home environment, requiring fewer connections resulting in longer battery life.

In today’s homes and also commercial properties, there’s an increased necessity for control to improve efficiency and productivity. And with that control, you have different products that measure temperature, water levels, security, and locks, so within those products reed switches play a major role in making them “smart”.

Standex Electronics is a global leader in the design, development, and manufacturing of standard and custom Reed Switches.

Product Training Module – Magnet Technology & Their Uses

Welcome to Standex Electronics where we will be exploring what magnets are and how they are used in the electronic industry. We will define the key terms relating to magnets and we will explore what magnets are, what they do, and how they are used.

Product Training Module – Magnetic Mapping

Welcome to Standex Electronics' presentation on magnetic mapping and how it can help the reed sensor designer.

Product Training Module – Liquid Level Sensing Technology

Welcome to Standex Electronics' presentation on the Liquid level sensing technology. We will present and define the liquid level sensing technology. We will also present the key functions and define all critical terms. Along with this we will investigate the various package configurations and review the various expanding applications.

Product Training Module – Reed Sensor vs. Hall & Mechanical

Welcome to Standex Electronics' How to Select the Correct Technology for a Given Sensor Requirement. We will focus on the following sensor technologies - Reed, Hall, and Electromechanical. These sensors all provide a switching function either directly or indirectly. We will introduce the key specifications, and how these parameters compare to each other for the different technologies.

Product Training Module – Automotive Liquid Level Sensing

Welcome to Standex Electronics Electronic's presentation on the exciting dramatic increase in automotive applications using hermetically sealed reed sensors. They are having a significant effect on automotive safety and adding to the overall vehicle intelligence. We will present the reed sensor's technology, how they 'tie into' the applications, and show how they solve the application's problem. We will also present many of the applications and go into detail on some of them.

How a Reed Switch Works

The Reed Switch is the core element in Reed Sensors, Level Sensors and Reed Relays. A magnetic contact switch consisting of two ferromagnetic blades are hermetically sealed inside a glass tube. The glass tube is filled with a high purity inert gas. Under non operating conditions the reed switch contacts do not touch. Standex Electronics is leading the way in reed switch manufacturing...

How Reed Switches are Manufactured

Ultra miniature and high precision Reed Switch manufacturing in the most modern factory of its kind. Standex Electronics micro technology enables the mass production of Reed Switches at the highest quality for competitive pricing. The complete process from the sputtering of the magnetic contacts through the hermetic sealing and final testing...

Reed Switch Technology

Standex Electronics expert discusses reed switch technology and why reed switches play such an important role in many applications.

3D Magnetic Mapping for Sensor Applications

Standex Electronics's technical expert describes their 3D Magnetic Mapping capabilities used in reed sensor applications

Reed Switch SMD Sensor & Magnet Actuation in 3-D

A Reed Switch Sensor on a surface mount PCB assembly shown in 3-D with actuating magnet. When viewed in three dimensions, the magnetic flux lines emanating from the magnet look like a beer barrel keg; and also in three dimensions, with the magnet parallel to the reed switch, the center magnetic lobe array looks like a donut and the two outside lobes look more like a boxer's punching bag -- the kind hung from the ceiling. Essentially the fields from the magnet and the fields for the lobes are symmetrical when viewed in three dimensions. As seen in two dimensions, when the magnet is brought into one of the lobes the reed switch contacts will close. Now, as seen in three dimensions the magnet can be brought into the lobes in any spherical direction for contact closure to occur. Here the magnet is moved into the sphere of influence of the lobes of the reed switch showing the closure and opening when the magnet enters the lobes and passes through them, The change in lighting signifies the closing and opening of the reed switch contacts.

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