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Solid-State Relay Product Categories

Discover the different types of solid-state relays and how they’re designed to meet specific application needs. Explore key

PCB-Mount OptoMOS Solid-State Relays

PCB-mount OptoMOS® solid-state relays provide reliable, compact switching solutions for space-constrained designs. Built using solid-state semiconductor technology, these relays eliminate mechanical wear while delivering consistent performance, low power consumption, and high reliability.

Available in a wide range of configurations, PCB-mount OptoMOS solid-state relays support diverse load requirements while maintaining excellent isolation and fast switching performance. Their compact footprint makes them ideal for high-density PCB layouts.

Panel-Mount Industrial Solid-State Relays

Panel‑mount industrial solid-state relays are designed to switch higher power loads in industrial environments. These relays are commonly mounted on control panels and heatsinks and are used to control heating elements, motors, lighting, and other high-current loads where frequent switching and reliability are critical.

Applications

  • Industrial ovens
  • HVAC equipment
  • Automation systems
  • Plastics and packaging machinery

Application Driven Groupings

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In many designs, selecting a solid-state relay starts with the application. Different loads, switching requirements, isolation needs, and thermal conditions influence whether a PCB‑mount / OptoMOS® solid-state relay or a higher‑power solid-state relay is most appropriate. Littelfuse solid-state relays are used across a wide range of applications—from compact electronic controls and instrumentation to heating, motor control, lighting, and industrial automation systems.

Interactive Product Categories Map

Solid-state relays are available in different architectures and form factors—ranging from integrated circuit‑based devices for printed circuit boards to high‑power relays designed for industrial control panels. This section introduces the major solid-state relay categories offered by Littelfuse and helps you understand how each type is typically applied before diving into specifications.

Product Categories

Product category Key features Key benefits
OptoMOS Relays
  • Normally open, normally closed, and changeover configurations
  • Integrated‑circuit, PCB‑mountable construction
  • Solid‑state semiconductor switching technology
  • Lower power consumption than electromechanical relays
  • Compact design supports high‑density PCB layouts
  • Reliable, bounce‑free switching
Smart Solid State Relays
  • Integrated current limiting and thermal management
  • Built‑in fault detection and protection features
  • Advanced solid‑state switching technology
  • Improves system safety and reliability
  • Helps prevent overload and overheating damage
  • Simplifies design in industrial and energy systems
High‑Voltage Analog Switch ICs
  • ±320 V and ±600 V switch blocking voltages
  • TTL‑controlled, galvanically isolated switching
  • Thermal shutdown and fault protection
  • Supports high‑frequency, high‑voltage switching
  • Protects sensitive electronics from overvoltage
  • Reduces board space versus discrete designs
Normally Open Relays
  • 30 V to 1 kV blocking voltages
  • Low output capacitance and on‑resistance options
  • Optically isolated solid‑state design
  • No moving parts for extended service life
  • Low EMI and low drive power requirements
  • Reliable switching in control and measurement systems
AC Power Relays
  • 400 V–800 V blocking voltage ratings
  • SCR‑based zero‑cross and instant‑on switching
  • PCB‑mountable and heat‑sink‑compatible designs
  • Minimizes electrical noise and EMI
  • Eliminates need for optocouplers or snubbers
  • Reliable AC load switching for HVAC and industrial systems
OptoMOS Power
  • 60 V–1 kV blocking voltages
  • Up to 22.8 A current handling with heat sinks
  • Low on‑state resistance and optical isolation
  • Efficient DC power switching
  • Reduced heat generation and power loss
  • Quiet, EMI‑free operation
Automotive Solid State Relays
  • Up to 200 A continuous, 500 A inrush current
  • High‑side and low‑side switching support
  • IP67‑rated rugged construction
  • Survives vibration, shock, and harsh environments
  • Eliminates arcing and contact wear
  • Ideal for commercial and specialty vehicles
Time‑Delay Relays
  • Multiple timing functions and delay ranges
  • Electromechanical and solid‑state options
  • Encapsulated designs available
  • Accurate, repeatable timing control
  • Long service life with low maintenance
  • Supports industrial automation and control logic
Industrial Solid State Relays
  • High‑endurance design for frequent switching
  • Zero‑cross and instantaneous switching options
  • Certified to global safety standards
  • Up to 2–3× longer life versus mechanical relays
  • Reduces downtime in industrial equipment
  • Supports high‑reliability automation systems
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