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Solid State Relays (SSRs) Selection Guide:

Solid State Relays (SSRs)
  Solid State Relays (SSRs)

About Solid State Relays (SSR's) and SCR Power Controllers Guide:

A solid state relay has a few major differences from an electromechanical one. SSRs have no moving parts and are extremely fast switching. SSRs are generally designed to turn on/off power when the line voltage crosses 0, so there is a smaller surge and no arcing which is a major problem with electromechanical relays that leads to their failure. Due to the fact that SSRs use semiconductor circuitry to switch the current, there is some heat that must be removed from the relay due to an internal voltage drop. This heat is removed through the heat sink that is appropriately sized for the load being switched. Heat sink design and application is one of NPHs' specialties and we have many innovative heat sink designs to solve this challenge. Since there are no moving parts and no arc, the expected lifecycle of a SSR is much greater that that of an electro mechanical model. With proper heat sink specification, billions of on/off cycles can be expected.
SCR's or silicone controlled rectifiers are switching devices for electrical power and have no moving parts. These devices can switch electrical loads within milliseconds and for millions of times. The increased speed allows for choosing between zero cross switching (also called zero-cross firing, burst firing or fast cycling) or phase angle switching. Heater life will be greatly increased by minimizing heater temperature fluctuations because of the less contraction and expansion of the heating elements. Electromechanical relays normally switch power every 10-20 sec. Shorter power switching cycles will reduce the electromechanical relays life span.

Applications Review:

Solid State Relays (SSR's) and Power Controllers (SCR's) are used in a wide variety of applications throughout industry as per below.
  • - Plastics Industry-Injection and Blow Molding, Plastics Extrusion, Blown film, Compounding
  • - Packaging Macinery, Hot Plates and Platens
  • - Medical Imaging, Electronic Components , ATM's and Photocopiers
  • - Aerospace Spacecraft and Satellites
  • - Temperature Control and Maintenance
  • - Power Generation, Water Purification
  • - Industrial Process Heaters
  • - HVAC Industries
Highly sophisticated relays are utilized to protect electric power systems against trouble and power blackouts as well as to regulate and control the generation and distribution of power. In the home, relays are used in refrigerators, washing machines and dishwashers, and heating and air-conditioning controls.
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Solid State Relay Categories Guide:

Our Solid State Relays (SSR's) and SCR Power Controllers Including Phase Angle and Zero Cross, Consist of the Following Categories:
  • Stripwire Power Controllers
  • New Reduced Heat Power Controllers
  • Compact Stripwire Power Controllers
  • Standard SSR Power Controllers
  • Compact Power Controllers
  • Phase Angle Power Controllers
  • Time Proportion Power Controllers
  • Time Proportion Loop Power Controllers
  • High Current Power Controllers
  • DC Power Controllers
  • Compact DC Power Controllers
  • Monitoring Products
  • Power Supplies
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