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KSK-1C90F Series Reed Switch


The KSK-1C90F series reed switch is a miniature (Form C) changeover reed switch or also referred to as single pole double throw (SPDT). Glass length of 14.0mm and diameter of 2.54mm. Rated power 10 W, Switching voltage 175 VDC, Switching current 0.5 Amp DC. N.C. lead has a dog leg bend. UL approval.


Overall Length mm (inches)54.5 (2.145)
Glass Length Max. mm (inches)14.0 (0.551)
Glass Dia. Max. mm (inches)2.54 (0.100)
Lead Dia. mm (inches)0.5 (0.019)
Contact Form1C (SPDT) Changeover
Pull-In Range15-40 AT
Rated Power Max.10W/175VDC/0.5 Amp DC


General purpose, industrial, test and measurement (ATE)

Series Data Sheet (PDF)

Stock Check

Item No.DatasheetDistributorRegionQuantityCartRFQInventory Date
KSK-1C90F-1015 MASTER/ONLINEAmericas0 RFQ2021-11-04
KSK-1C90F-1520 Reed-Rex LLCAmericas1,953 RFQ2021-11-04
KSK-1C90F-2025 Heilind ElectronicsAmericas0 RFQ2021-11-04
KSK-1C90F-1015 Heilind ElectronicsAmericas1,000 BUY RFQ2021-11-04
KSK-1C90F-1520 Heilind ElectronicsAmericas790 BUY RFQ2021-11-04
KSK-1C90F-2025 Digi-Key ElectronicsAmericas25,885 BUY RFQ2021-11-04
KSK-1C90F-1520 Digi-Key ElectronicsAmericas2,017 BUY RFQ2021-11-04
KSK-1C90F-1015 Digi-Key ElectronicsAmericas1,604 BUY RFQ2021-11-04
KSK-1C90F-2025 MASTER/ONLINEAmericas890 BUY RFQ2021-11-04
KSK-1C90F-1520 MASTER/ONLINEAmericas0 RFQ2021-11-04
KSK-1C90FStandex FactoryAmericas0 RFQ2021-12-01
KSK-1C90F-2025 Mouser ElectronicsAmericas3,700 BUY RFQ2021-12-01
KSK-1C90F-1520 Mouser ElectronicsAmericas1,484 BUY RFQ2021-12-01
KSK-1C90F-1015 Mouser ElectronicsAmericas712 BUY RFQ2021-12-01
KSK-1C90F-1015 Arrow ElectronicsAmericas900 BUY RFQ2021-12-01
KSK-1C90F-2025 TTI Inc Global HeadquartersAmericas1,500 BUY RFQ2021-12-01
KSK-1C90F-1520 TTI Inc Global HeadquartersAmericas0 RFQ2021-12-01
KSK-1C90F-1015 TTI Inc Global HeadquartersAmericas0 RFQ2021-12-01
KSK-1C90F-3752 TTI Inc Global HeadquartersAmericas0 RFQ2021-12-01

Parametric Search

Contact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentOverall Length (mm)Size Body
Part Number Contact ConfigurationOperate RangeContact RatingSwitching VoltageSwitching CurrentOverall Length (mm)Size BodySpecial Feature
KSK-1C90F-1015SPDT10 ~ 15 AT10 W175 V0.5 A2.145" (54.5mm)0.551" L x 0.100" Dia (14.00mm x 2.54mm)Miniature, Change Over, Dog Leg Version
KSK-1C90F-1520SPDT15 ~ 20 AT10 W175 V0.5 A2.145" (54.5mm)0.551" L x 0.100" Dia (14.00mm x 2.54mm)Miniature, Change Over, Dog Leg Version
KSK-1C90F-2025SPDT20 ~ 25 AT10 W175 V0.5 A2.145" (54.5mm)0.551" L x 0.100" Dia (14.00mm x 2.54mm)Miniature, Change Over, Dog Leg Version
KSK-1C90F-3752SPDT37 ~ 52 AT10 W175 V0.5 A2.145" (54.5mm)0.551" L x 0.100" Dia (14.00mm x 2.54mm)Miniature, Change Over, Dog Leg Version

Associated Parts

The KSK-1C90U series reed switch is a miniature (Form C) changeover reed switch or single pole double throw (SPDT) reed switch. Glass length of 14.0mm and diameter of 2.54mm. Rated power 10 W, Switching voltage 175 VDC, Switching current 0.5 Amp DC. Most used, UL approval.

The KSK-1C10 series reed switch is a high power and current changeover reed switch. A changeover switch is also referred to as single pole double throw (SPDT) reed switch. Glass length of 34.3mm and diameter of 5.16mm. Rated power 100 W, Switching voltage 500 VDC, Switching current 3 Amp DC.

The MK23-90 surface mount reed switch is a (Form C) changeover or single pole double throw SPDT miniature (SMD) surface mount reed switch with glass length of 14mm and diameter of 2.54mm. Rated power 10 W, switching voltage 175 VDC, switching current 0.5 Amp DC. The MK23-90 surface mount reed switch is a bare glass version of our surface mount reed sensors, offering a more economic and compact design as compared to our over-molded reed sensors. Sold in Tape & Reel packing according to IEC 286/part 3 and is suitable for pick and place automation.

Technical Papers

Datasheet – KOFU Reed Switch ORD624Datasheet – KOFU Reed Switch ORD611Datasheet – KSK or SW GP560 Series Reed SwitchDatasheet – KSK or SW GP501 Series Reed SwitchDatasheet – KOFU Reed Switch ORD221Datasheet – KOFU Reed Switch ORD324HDatasheet – KOFU Reed Switch ORD2211HDatasheet – KSK-1A33 Series Reed SwitchDatasheet – KOFU Reed Switch ORT551Datasheet – KOFU Reed Switch ORD9215Datasheet – KOFU Reed Switch ORD2211Datasheet – KOFU Reed Switch ORD2210VDatasheet – KOFU Reed Switch ORD2210Datasheet – KOFU Reed Switch ORD324Datasheet – KOFU Reed Switch ORD314Datasheet – KOFU Reed Switch ORD312Datasheet – KOFU Reed Switch ORD311Datasheet – KOFU Reed Switch ORD229Datasheet – KOFU Reed Switch ORD228VLDatasheet – KOFU Reed Switch ORD219Datasheet – KOFU Reed Switch ORD213Datasheet – KOFU Reed Switch ORD211Datasheet – PR560 Series Reed SwitchDatasheet – PR126 Series Reed SwitchDatasheet – NL126 Series Reed SwitchDatasheet – KSK-1C90U Series Reed SwitchDatasheet – KSK-1C90F Series Reed SwitchDatasheet – KSK-1C10 Series Reed SwitchDatasheet – KSK-1A87 Series Reed SwitchDatasheet – KSK-1A85 Series Reed SwitchDatasheet – KSK-1A83 Series Reed SwitchDatasheet – KSK-1A80 Series Reed SwitchDatasheet – KSK-1A69 Series Reed SwitchDatasheet – KSK-1A66/3 Series Reed SwitchDatasheet – KSK-1A66 Series Reed SwitchDatasheet – KSK-1A55 Series Reed SwitchDatasheet – KSK-1A52 Series Reed SwitchDatasheet – KSK-1A46 Series Reed SwitchDatasheet – KSK-1A35/1 Series Reed SwitchDatasheet – KSK-1A35 Series Reed SwitchDatasheet – GR 560 Series Reed SwitchDatasheet – GR 501 Series Reed Switch



Standex Electronics | Company Video

Standex Electronics is a worldwide market leader in the design, development, and manufacture of standard and custom electro-magnetic components, including magnetics products and reed switch-based solutions.

In this video, we discuss our global manufacturing and supply chain capabilities by fueling the processes that we often take for granted every day. Through our diverse in-house capabilities and strong engineering designs we PARTNER with our customers to SOLVE their unique challenges, and DELIVER custom high-performing solutions...

Standex Electronics | Values

Standex Electronics new company video shares our global manufacturing and supply chain capabilities through our partner, solve, and deliver approach.

Standex Electronics dynamic engineering and diverse product line of custom and standard components deliver reliable high-quality solutions to customers across broad markets and applications. Our robust product offerings include Reed Switches, Relays, and Sensors, Planar Transformers and Inductors, and Fluid Level Sensors that provide solutions for the Automotive, HVAC, Alternative Energy, Lighting/LED, Appliance, Mil-Aero, Medical, and many others...

Standex Electronics Japan | Company Video

Standex Electronics Japan is a worldwide market leader in the design, development, and manufacturing of magnetic reed switches. Headquartered in Kofu City, Japan it was previously branded as the OKI Sensor Device Corporation prior to being acquired by Standex Electronics, Inc., a division of Standex International. The new name of OKI Reed Switches is KOFU, A Standex Electronics Brand.

Fluid Level Sensors for Automotive & Transportation

Standex Electronics solved an automotive customer's problem and delivered a custom, fast design and quick turn molded liquid level sensor solution that fit the exacting needs for space and performance, while eliminating any potential for a battery coolant leak.

By integrating a float inside the tank and placing a reed sensor on the outside that can sense through the plastic wall, we were able to provide a fluid level sensor that didn't compromise the coolant tank's pressurized seal.

Fluid level sensors can be found in automotive applications from washer bottle fluid to engine coolant sensor applications. "The reed switch sensor technology works well."

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

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 – Reed Switch Overview

Welcome to Standex Electronics' Reed Switch Technology training module. This module will explain the functionality, unique features, structure, and crucial manufacturing and design element to reed switch technology. This module will also explain some basic switch parameters as well as describe basic reed switch operation along with a few applications.

Product Training Module – Reed Switch Magnet Interaction

Welcome to Standex Electronics' 'how magnets and reed switches interact with each other forming a sensing function' training module. This module will define key terms for magnets and reed switches. The module will also describe how the positioning of the magnet's north and south poles relative to the reed switch, produces different magnetic field arrays. Understanding these magnetic field arrays will give insight into how the magnet and reed switch form their sensing function.

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.

Como se Fabrica un Ampolla Reed (ES)

Construir los interruptores de lengüeta no es ningún trabajo fácil. Ser la fábrica más moderna de su clase en Europa, nuestra producción en Turingia es un mundo de ellos mismos. El tamaño de estos componentes de alta precisión es extremadamente reducido, la capa ultrafina y el trabajo meticuloso se requieren en cada paso de la producción. Esta microtecnología permite la producción en masa de los productos de alta calidad a precios competitivos.

Standex Electronics at AHR Expo 2013

Alex Vinnage talks about what attendees can expect from Standex Electronics at the 2013 AHR Expo.

Linea de Productos Standex Electronics (ES)

Los Interruptores de Lengüeta, Relés de Lengüeta y Sensores de Lengüeta son nuestros productos más importantes. Estos tres grupos tienen una cosa en común: el Interruptor de Lengüeta es el elemento núcleo de todos ellos. Los Interruptores de Lengüeta so dispositivos operados magnéticamente, que han sido inventados por Laboratorios Bell a principios de los años 1940' en Estados Unidos. Funcionan con un principio simple:Dos hojas ferromagnéticas traslapadas de hierro se sellan en un tubo de cristal, separados por una distancia de solamente unos pocos micrones...

Comment fonctionnent les Ampoules Reed (FR)

Les ampoules Reed, les relais Reed et les capteurs Reed sont nos produits les plus importants. Ces trois groupes ont une chose en commun: l'ampoule Reed, « au cœur » de tous ces produits.. Les ampoules Reed sont des appareils activés magnétiquement, qui furent inventés par Bell Labs aux Etats-Unis dans les années 1940. Ils fonctionnent selon un principe simple: Deux lames ferromagnétiques qui se chevauchent , sont scellées dans un tube de verre, séparées par une distance de quelques microns seulement...

Comment sont fabriquées les Ampoules Reed (FR)

Fabriquer des ampoules Reed n'est pas un travail facile. Etant l'usine la plus moderne dans son genre en Europe, notre production de Thuringe est « dans un autre monde » . La taille de ces composants à haute précision est extrêmement petite, l'enduit ultra-mince, un travail méticuleux est exigé dans chaque étape de production. Cette micro technologie permet la production en série de produits de qualité aux prix concurrentiels...

Benvenuti in MEDER (IT)

Molto spesso sono le cose più piccole ad avere l'impatto maggiore nella nostra vita. A volte non le percepiamo neanche, anche se rendono la nostra vita più confortevole e sicura. Sono utilizzate in veicoli, ingegneria della sicurezza, elettrodomestici, dispositivi medici, telecomunicazione e sistemi industriali di ogni tipo. Precisi, affidabili e di lunga durata. Questi interruttori reed, sensori e relè miniaturizzati lavorano instancabilmente secondo la legge di Reed. Anche se a prima vista sembrano semplici, sono in realtà delle vere e proprie meraviglie dell'ingegneria che solo poche aziende al mondo sono in grado di produrre. E noi siamo una di esse: MEDER electronic. Prodotti innovativi per il futuro...

Gamma di prodotti Standex Electronics (IT)

Interruttori reed, relè reed e sensori reed sono i nostri prodotti più importanti. Queste tre categorie di prodotti hanno una cosa in comune: l'ampolla reed, che è il loro elemento centrale. Le Ampolle reed sono dispositivi azionati magneticamente, che furono inventati nei primi anni '40 negli Stati Uniti, nei laboratori Bell. Funzionano secondo un principio molto semplice: due lame di materiale ferromagnetico sono ermeticamente sigillate all'interno di un tubo di vetro...


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