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MRX Series Reed Relay


The MRX Series is an ATEX approved reed relay according to KIWA 19ATEX0051 U and IECEx KIWA 19.0026U and is used for the galvanic separation of intrinsic safety and non-intrinsic safety circuits in hazardous locations. The MRX ATEX & IECEx approved reed relays are suitable for circuits of the protection method “ia” (intrinsic safety) up to the Zone 0 in the gas and vaporous atmosphere. It is designed for the temperature range -40°C to +85°C and for the peak voltage up to 375 VDC and 50 Watt. Switching configuration is 1 – 4 Form A or 2 Form C switches.

Type of protection: II (1) G  [Ex ia Ga]  IIC
In accordance with: EN 60079-0 : 2018, EN 60079-11 : 2012

ATEX Examination Certificate & Assessment Report

IECEx Declaration of Conformity

Mounting Instructions



Coil Voltage (VDC)5, 12, 24
Coil Resistance (Ω)360 - 5580
Contact Form1-4A Normally Open (N.O.), 1C (SPDT) Changeover, etc.
Rated Power Max.10W/170VDC/0.5A


Chemical industry and refineries, hazardous locations, process automation in the mining industry, test and measurement (ATE)

Series Data Sheet (PDF)

Stock Check

Item No.DatasheetDistributorRegionQuantityCartRFQInventory Date
MRX05-1A71 Electro Sonic GroupAmericas0 RFQ2024-07-15
MRX12-1A71 Electro Sonic GroupAmericas0 RFQ2024-07-15
MRX24-1A71 Heilind ElectronicsAmericas0 RFQ2024-07-13
MRX05-1A71 Heilind ElectronicsAmericas0 RFQ2024-07-13
MRX12-1C90 Heilind ElectronicsAmericas0 RFQ2024-07-13
MRX12-1C90 Digi-Key ElectronicsAmericas49 BUY RFQ2024-07-14
MRX24-1A71 Digi-Key ElectronicsAmericas0 RFQ2024-07-14
MRX12-1A71 Digi-Key ElectronicsAmericas96 BUY RFQ2024-07-14
MRX05-1A71 Digi-Key ElectronicsAmericas96 BUY RFQ2024-07-14
MRX05-1A71 MASTER/ONLINEAmericas0 RFQ2024-07-15
MRX12-1A71 MASTER/ONLINEAmericas0 RFQ2024-07-15
MRXStandex FactoryAmericas0 RFQ2024-07-15
MRX12-1A79 Mouser ElectronicsAmericas42 BUY RFQ2024-07-15
MRX12-1C90 Mouser ElectronicsAmericas82 BUY RFQ2024-07-15
MRX05-1A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX24-1A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX12-1A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX05-1A74-BV335Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX05-1C21Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX12-2A79 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX24-1C90 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX12-2A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX24-4A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX05-2A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX12-1C21Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX24-1A79 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX24-2A71 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX05-1A79 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX05-1C90 Mouser ElectronicsAmericas0 RFQ2024-07-15
MRX12-1A71 Arrow ElectronicsAmericas96 BUY RFQ2024-07-15
MRX12-1A79 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-1C90 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1C21TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A71 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A74-BV335TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX24-1A71 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-1A71 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX24-1A79 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A21TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A79 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1C71TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-4A71TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX24-4A71 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-2C90-3 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A90TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-2A79 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX06-1A71TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-2A71 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1A74TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1C79TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX12-1C21TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX24-1C21TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-1C90 TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-2A79TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15
MRX05-4A79TTI Inc Global HeadquartersAmericas0 RFQ2024-07-15

Parametric Search

Coil VoltageSwitches & Contact FormContact ConfigurationSwitching LoadSwitching VoltageMounting TypeOptionSpecial Feature
Part NumberCoil VoltageSwitches & Contact FormContact ConfigurationSwitching LoadSwitching VoltageMountingOptionSpecial Feature
MRX05-1A7151ASPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX05-1A7951ASPST-NO< 50 W< 1000 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX05-1C9051CSPDT< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX05-2A7152ADPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-1A71121ASPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-1A79121ASPST-NO< 50 W< 1000 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-1C90121CSPDT< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-2A71122ADPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-2A79122ADPST-NO< 50 W< 1000 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX12-2C90-3122CDPDT< 10 W< 200 VDCThrough Hole (THT)DiodeIntrinsically Safe
MRX24-1A71241ASPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX24-1A79241ASPST-NO< 50 W< 1000 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX24-1C90241CSPDT< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX24-2A71242ADPST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe
MRX24-4A71244A4PST-NO< 10 W< 200 VDCThrough Hole (THT)StandardIntrinsically Safe

Associated Parts

Our most versatile general purpose BE Series Reed Relay with many contact configuration options including up to 5 form A switches. Available in latching or high IR typical 10^13 Ω. Plastic or metal housing, epoxy encapsulated.

General purpose line sensing dual in-line DIL Series Reed Relay with coil up to 11.000 Ω. Supplied in an epoxy encapsulated package. Available with dielectric strength 4.25kVDC. Optional diode and magnetic shield. UL approval.

General purpose dual in-line (DIL) IC compatible DIP Series Reed Relay supplied in a rugged thermoset overmolded package. Available with dielectric strength 4.25kVDC. Optional diode. UL approval.

UL Certificate of Compliance

The LI series is a high voltage reed relay and high insulation reed relay that is epoxy encapsulated. This high voltage reed relay features a high insulation resistance (IR) >10^13 Ω and is capable of switching up to 1kVDC, breakdown voltage of 4.5kVDC, isolation voltage to 7kVDC. UL approval.

General purpose micro single in-line (SIL) MS Series Reed Relay with rugged thermoset overmolded package has a standard internal magnetic shield. This instrumentation grade relay can be stacked in close matrices. Available in high frequency version up to 1GHz. Optional diode. UL approval.

UL Certificate of Compliance

The single in-line SIL RF series high frequency reed relay is capable of switching signals from DC to 1.5GHz. This instrumentation grade RF reed relay is supplied in a rugged thermoset overmolded package. Utilizes minimum PCB area at only 50% compared to our DIP and DIL series. Available with dielectric strength 4kVDC. Optional diode and magnetic shield. 

General purpose instrumentation grade single in-line SIL Series Reed Relay is supplied in a rugged thermoset overmolded package. Utilizes minimum PCB area at only 50% compared to our DIP and DIL series. Available with dielectric strength 4kVDC. Optional diode and magnetic shield. UL approval.

UL Certificate of Compliance

Ultraminiature instrumentation grade single in-line (SIL) UMS Series Reed Relay used in very closely stacked matrices. Measure nearly 50% smaller than the standard MS series reed relay. Contains and internal magnetic shield. UL approval.

UL Certificate of Compliance

Ultraminiature 8-pole low profile through hole mount (THT) RM05-8A-SP Series Reed Relay module with standard dual in-line (DIL) pin-out (2mm raster) and integrated magnetic shield for high density board mounting. Equipped with an 8-channel relay driver with MAX4823 with kickback protection and parallel activation electronics. Designed to significantly reduce PCB space at 24% smaller than our RM05-8A, saves on wiring costs, and assembly costs.

Technical Papers

Datasheet – MRE Series Reed RelayDatasheet – BH Series Reed RelayDatasheet – Photo MOSFET Relay SMP-42 SeriesDatasheet – MHV Series Reed RelayDatasheet – Photo MOSFET Relay SMP-58 SeriesDatasheet – Photo MOSFET Relay SMP-74 SeriesDatasheet – Photo MOSFET Relay SMP-45 SeriesDatasheet – Photo MOSFET Relay SMP-40 SeriesDatasheet – Photo MOSFET Relay SMP-38 SeriesDatasheet – Photo MOSFET Relay SMP-47 SeriesDatasheet – Photo MOSFET Relay SMP-36 SeriesDatasheet – Photo MOSFET Relay SMP-23 SeriesDatasheet – Photo MOSFET Relay SMP-21 SeriesDatasheet – Photo MOSFET Relay SMP-30 SeriesDatasheet – Photo MOSFET Relay SMP-31 SeriesDatasheet – Photo MOSFET Relay SMP-37 SeriesDatasheet – SHV Series Reed RelayDatasheet – 567 Series OptocouplersDatasheet – 535 Series OptocouplersDatasheet – 530-70 Series OptocouplersDatasheet – 530-03 Series OptocouplersDatasheet – 528 Series OptocouplersDatasheet – 525 Series OptocouplersDatasheet – 522 Series OptocouplersDatasheet – 521 Series OptocouplersDatasheet – MRX Series Reed RelayDatasheet – RM05-8A-S Series Reed RelayDatasheet – RM05-4A Series Reed RelayDatasheet – BT/BTS Series Reed RelayDatasheet – HI Series Reed RelayDatasheet – SIL HV Series Reed RelayDatasheet – LI Series Reed RelayDatasheet – KT Series Reed RelayDatasheet – HM Series Reed RelayDatasheet – HE Series Reed RelayDatasheet – H Series Reed RelayDatasheet – SIL RF Series Reed RelayDatasheet – HF Series Reed RelayDatasheet – CRF Series Reed RelayDatasheet – UMS Series Reed RelayDatasheet – SIL Series Reed RelayDatasheet – MS Series Reed RelayDatasheet – DIP Series Reed RelayDatasheet – DIL Series Reed RelayDatasheet – CRR Series Reed RelayDatasheet – BE Series Reed Relay



Standex Electronics Global Reed Switch Products and Capabilities

As the leader in reed switch technology, Standex impacts lives by contributing to effective product performance in household, automotive and utilities applications.

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.

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 – RF Reed Relays Part I

Welcome to Standex Electronics' RF Reed Relays Part I training module. Reed relays have long been known to have the capability to switch and carry RF signals and fast digital pulses. Hardly anyone thought reed relays were capable of switching and carrying RF up to 20 GHz, because the reed switch's leads are composed of nickel/iron which has a relatively high permeability or (MU). However, 20GHz is now a reality at Standex Electronics. We will be presenting the reasons Standex Electronics and their design team have made this possible.

Product Training Module – RF Reed Relays Part II

Welcome to Standex Electronics' RF Reed Relays Part II training module. This second RF presentation assumes you have already heard the first Standex Electronics RF Part I presentation. Understanding the simple physical layout of a reed relay makes it easy to design and rest reed relays for RF and fast digital pulse applications. RF is dependent on the physical layout or signal path it takes while going through circuits and the components that make up those circuits. We will show you how the physical layout of the reed relay will have a direct bearing on the RF signal's success going into and out of the reed relay. Coupled with the relay's physical layout, the materials making up the reed relay are also important.

Product Training Module – Reed Relay Overview

Welcome to Standex Electronics Reed Relay training module. This module will define key terms used in reed relays and their applications. The module will also describe the structure and function of reed relays and their vast number of applications.

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 – Latching Form B Reed Relays & Sensors

Welcome to Standex Electronics' Latching and Form B Reed Relay and Sensor training module. This module will define key terms of Form B and Latching sensors and relays. The module will also describe the structure and function of latching and Form B reed relays and sensors.

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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