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Custom Engineered Solutions
Reed Switches
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  Reed Switches
  Standex Detect reed switches provide reliable, hermetically sealed switching for position, proximity and sensing applications. Available in a wide range of sizes, power ratings and configurations, they deliver durability, precision and long operating life.
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- All Reed Switches
- Changeover Reed Switches
- Surface Mount SMD Reed Switches
- High-Frequency Reed Switches
- High Power Reed Switches
- High Voltage Reed Switches
- Miniature Reed Switches (9–14 mm)
- Ultraminiature Reed Switches (<8 mm)
- Bistable and Latching Reed Switches
Sensors
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  Sensors
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- Proximity Sensors
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    Proximity Sensors
    Standex Detect proximity sensors use reed, Hall effect, and magnet detection for accurate, contactless sensing. From automotive and industrial equipment to appliances and security systems, they provide safe and seamless integration.
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  - All Proximity Sensors
  - Flange/Screw Mount Proximity Sensors
  - Magnet Detection Proximity Sensors
  - Reed Proximity Sensors
  - Cylindrical Proximity Sensors
  - Metal Detection Proximity Sensors
  - Hall Effect Proximity Sensors
  - Threaded Housing Proximity Sensors
- Position Sensors
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    Position Sensors
    Standex Detect position sensors deliver accurate feedback for movement, rotation, and alignment using reed, Hall effect, and magnet detection. Designed in multiple mounting styles, they ensure reliable performance in automotive, industrial and medical applications.
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  - All Position Sensors
  - Flange/Screw Mount Position Sensors
  - Hall Effect Position Sensors
  - Threaded Housing Position Sensors
  - Reed Position Sensors
  - Metal Detection Position Sensors
  - Magnetic Field Strength Position Sensors
  - Key Switch Position Sensors
- Speed Sensors
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    Speed Sensors
    Standex Detect speed sensors deliver accurate measurement of rotation, direction, and RPMs using contactless sensing of ferrous targets. Built for durability, they ensure dependable performance in automation, industrial, and heavy equipment applications.
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  - Gear Detection Speed Sensors
- Liquid Level Sensors and Floats
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    Liquid Level Sensors and Floats
    Standex Detect liquid level sensors provide single-point, multipoint and continuous measurement using reed, conductive and Hall effect technologies. They deliver reliable performance across water, fuel, chemical and coolant applications.
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  - All Liquid Level Sensors
  - Single Point Liquid Level Sensors
  - Vertical Mount Liquid Level Sensors
  - Magnetic Floats
  - Multipoint Liquid Level Sensors
  - Side-Mounted Liquid Level Sensors
  - Reed Liquid Level Sensors
  - Continuous Liquid Level Sensors
  - External Bottle Mount Liquid Level Sensors
- Magnets and Actuators
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    Magnets and Actuators
    Standex Detect magnets and actuators deliver consistent magnetic strength and durability for sensing and actuation needs. Available in bare or packaged formats, they integrate with reed and Hall effect sensors across automotive, industrial, and medical applications.
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  - All Magnets and Actuators
  - Bare Magnets
  - Packaged Magnet
  - Sensor Paired Magnet
Relays
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  Relays
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- Reed Relays
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    Reed Relays
    Standex Detect reed relays combine hermetically sealed reed switch technology with optimised coils for high reliability and long life. Available in multiple configurations, they serve medical, telecom, and industrial applications.
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  - All Reed Relays
  - Intrinsically Safe Relays
  - General Purpose Relays
  - High Density Matrix Relays
  - High Frequency Relays
  - High Insulation Resistance Relays
  - High Voltage and Power Relays
  - Low Thermal Relays
  - Relay Module
  - Sanyu Reed Relays
  - Ultraminiature Relays
  - Unique Characteristics
- Photo-MOSFET Relays
  - Relays
    
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    Photo-MOSFET Relays
    Standex Detect Photo-MOSFET relays deliver compact solid-state switching with fast response, silent operation, and long life. Supporting high voltage and current handling, they provide durable, bounce-free performance in demanding environments.
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  - All Photo-MOSFET Relays
  - DIP Photo-MOSFET Relays
  - General Purpose Photo-MOSFET relays
  - High Current > 1A Photo-MOSFET Relays
  - High Voltage > 600V Photo-MOSFET Relays
  - High Voltage > 1.5 kV Photo-MOSFET Relays
  - Low Capacitance Photo-MOSFET Relays
  - SOP Photo-MOSFET Relays
  - SMD Photo-MOSFET Relays
- Optocouplers
  - Relays
    
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    Optocouplers
    Standex Detect optocouplers provide galvanic isolation and solid-state switching for analogue and digital signals. With fast response, low capacitance, and high insulation, they deliver reliable performance in medical, industrial, and hazardous environments.
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  - All Optocouplers
  - ATEX and IECEx Certified
  - Non-Certified Optocouplers
Markets
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- Appliances
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    Appliances
    The appliance industry is rapidly evolving with smart home integration, energy efficiency, and user-focused design. From high-efficiency washers and refrigerators to connected kitchen appliances, reed switches, sensors, and relays deliver reliable performance and safety.
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  - Flood Detection
  - Home/Consumer Appliances
  - HVAC Systems
  - Industrial Appliances
- Computing and Data Centres
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    Computing and Data Centres
    Data centres power the cloud, AI, and global communications. Advanced reed switches, sensors, and relays support OEMs, integrators, and infrastructure providers in building systems that are smarter, safer, and more resilient.
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  - Environmental
  - Security
- Construction and Agriculture
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    Construction and Agriculture
    From building sites to fields, rugged reed switches, sensors, and relays keep heavy equipment safe and efficient. Technologies support electrification, automation, and precision in demanding environments.
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  - Accessories
  - Autonomous
  - Electric
  - In Cab
  - Monitoring
- Consumer Electronics
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    Consumer Electronics
    Consumer electronics demand performance, miniaturisation, and reliability. From wearables and smart devices to next-gen gaming consoles, Reed switches, sensors, and relays ensure seamless, dependable digital experiences.
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  - Battery Devices
  - Gaming and Toys
  - Smart Devices
- Industrial and Automation Equipment
  - Markets
    
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    Industrial and Automation Equipment
    In the age of Industry 4.0, manufacturers need components that are smart, scalable, and robust. Standex Detect partners with OEMs to deliver custom reed switches, sensors, and relays that optimise performance, reduce downtime, and enable intelligent control.
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  - Factory Automation
  - Food and Beverage
  - Hazardous Locations and ATEX
  - Process Controls
  - Robotics
  - Warehousing IoT
  - Water Treatment
  - Welding Equipment
- Medical Devices
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    Medical Devices
    The medical industry requires precision, reliability, and compliance. From surgical robotics and imaging systems to monitoring and therapy equipment, reed switches, sensors, and relays support innovation and patient safety.
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  - Diagnostic Equipment
  - Equipment Position
  - Portable Defibrillators
  - Sterilisers/Autoclaves
  - Surgical and Therapy Equipment
- Renewable Energy
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    Renewable Energy
    The renewable energy market is expanding with decarbonisation and distributed systems. From utility-scale batteries and solar inverters to wind turbines, reed switches, sensors, and relays enable efficient, safe, and reliable energy flow.
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  - Energy Storage Systems
  - Solar and Wind Energy
- Safety and Security
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    Safety and Security
    The security industry is advancing with smart infrastructure, automation, and real-time monitoring. From access control and intrusion detection to emergency response, reed switches, sensors, and relays safeguard people and property.
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  - Alarm and Security Systems
  - Building Security
  - Equipment Security
  - Fire Suppression Equipment
  - Intrusion Detection
  - Smart Home Security
- Test and Measurement
  - Markets
    
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    Test and Measurement
    Test and measurement rely on precision, repeatability, and accuracy. From validating sensors and semiconductors to compliance and safety testing, reed switches, sensors, and relays deliver high-performance, reliable results.
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  - Automatic Test Equipment
  - Automotive / Mil-Aerospace
  - Data Acquisition
  - Instrumentation
  - Electrical Safety and Compliance Testing
- Transport
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    Transport
    Transport is being transformed through electrification, autonomy, and sustainability. From EVs and charging stations to aircraft, marine, and heavy vehicles, reed switches, sensors, and relays enable safer, smarter mobility.
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  - Aerospace and Aviation
  - Buses, Lorries and Utility Vehicles
  - Charging Stations
  - E-Vehicles
  - Marine and Naval
  - Motorbikes/Scooters
  - Passenger Vehicles
  - Railways
  - Recreational vehicles
- Utilities
  - Markets
    
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    Utilities
    Utilities require reliability, safety and fast responsiveness. From smart grids and water treatment systems to substation monitoring, reed switches, sensors and relays keep critical infrastructure running efficiently and securely.
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  - Metering
  - Monitoring
  - Oil and Gas
  - Power Generation
Resources
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- Blog
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- News and Press Releases
- Media Articles
- Video Library
- Glossary of Terms
- Global Quality Certificates
- Discontinuation Notices
- Frequently Asked Questions
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    Frequently Asked Questions
    This is where you can find all of the frequently asked questions related to Reed Switches, Reed Sensors, Reed Relays, Magnets, etc. Select a category to get started.
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  - Frequently Asked Questions: Switches
  - Frequently Asked Questions: Sensors
  - Frequently Asked Questions: Relays
  - Frequently Asked Questions: Level Sensors
  - Frequently Asked Questions: Magnets and Magnetics
  - Frequently Asked Questions: Quality and Reliability
  - Frequently Asked Questions: Testing Characteristics
- Reed Technology Academy
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    Reed Technology Academy
    Dive into our expertly curated Reed Technology Academy for comprehensive training and technical guides. Whether you’re an engineer, designer, or curious learner, gain practical insights into reed switch design, functionality and applications.
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  - Reed Switch Characteristics
  - Handling and Load Precautions
  - About Magnets
  - Life Test Data
  - Test Coils
  - Reed Relay Characteristics
  - Reed Sensor Activation Distances: Magnet Orientation and Sensitivity Guide
  - Magnet Interaction
About Standex Detect
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  About Standex Detect
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- Office Locations
- Contact Standex Detect
- Social Responsibility
- Sustainability
- Engineering Excellence
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    Engineering Excellence
    At Standex Detect, excellence is more than a standard; it’s a mindset. From how we collaborate with customers to the way we engineer and deliver solutions, we’re driven by a commitment to quality, innovation and performance. Explore the principles and practices that define how we operate and set us apart in the market.
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  - Customer Intimacy Approach
  - Customer-Driven Innovation
  - Quality Standards

Home Products and Components Relays Photo-MOSFET Relays Low Capacitance Photo-MOSFET Relays

Low Capacitance Photo-MOSFET Relays

Optimised for high-speed signal transmission and minimal signal distortion, these relays feature low off-state capacitance, making them ideal for RF, telecoms, and precision measurement applications.

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SMP-21 Photo-MOSFET Relay
SMP-23 Photo-MOSFET Relay

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Low Capacitance Photo-MOSFET Relays

SMP-21 Photo-MOSFET Relay

SMP-23 Photo-MOSFET Relay

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