What is a solid-state relay?

Sens4 Knowledge content



Solid-state relays, just like traditional electro-mechanical relays, serve the purpose of providing a switching contact function. However, while electro-mechanical relays use a physically moving part to make contact, solid-state relays are semiconductor-based.


Solid state relays have numerous advantages over traditional relays:


  • Superior reliability with no erratic operation or bounce
  • Arc-free contacts
  • Faster response time (typically <100 µs vs. >5 ms for traditional relays)
  • Insensitivity to mechanical forces and magnetic fields
  • Do not generate EMI (electromagnetic interference)
  • Significantly longer lifetime
  • Lower power consumption


Solid state relays

Reliable switching function is important in many different industrial process control applications like controlling of pressure and vacuum. Transducers and transmitters for process controlling can have integrated relays that are used to control safety interlock circuits and critical process parameters. When pressure and vacuum measurement applications require high level of confidence in setpoint switching functionality, it is important to use a transducer with solid-state relays and avoid the use transducers with legacy electro-mechanical relays.


Sens4 offers temperature, pressure and vacuum transducers with integrated high-performance UL listed, CSA recognized, and EN/IEC 60950-1 certified solid-state relays. For more information visit our product page.


Pressure measurement products from Sens4

■ Ceramic & Steel diaphragm

■ Programmable features

■ Precision performance


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