Solid State Relay Switches

A solid state relay is a control relay with isolated input and output, whose functions are achieved by means of electronic components without the use of moving parts such as those found in electromechanical relays. These electrical relays are ideal for applications with many contact closures since solid state relay switches offer a greatly extended life compared to electromechanical relays.

Operational Overview:
Solid state relays (SSR) are similar to electromechanical relays, in that both use a control circuit and a separate circuit for switching the load. When voltage is applied to the input of the SSR, the relay switch is energized by a light emitting diode. The light from the diode is beamed into a light sensitive semiconductor which, in the case of zero voltage crossover control relays, conditions the control circuit to turn on the output of the solid state switch at the next zero voltage crossover.

In the case of non-zero voltage crossover relays, the output of the solid state switch is turned on at the precise voltage occurring at the time. Removal of the input power disables the control circuit and the solid state relay switch is turned off when the load current passes through the zero point of its cycle.

Solid state relays have features which electromechanical relays do not, such as:

• Long life
• Shock and vibration resistance
• Generation of RFI, EMI
• No contact bounce
• Arcless switching
• Acoustic noise
• Zero voltage switching
• IC compatibility
• Immunity to humidity, salt spray and dirt

AD-SSR Series Solid State Relay Switches

The AD-SSR series solid state relay features include:

• AC & DC Input
• AC Output
• 10 or 25 Amp loads
• Isolated zero voltage switching
• 4000 V rms isolation input to output
• Internal RC (snubber) network
• RFI suppression
• Integral safety cover and heatsink (heatsink is built into the product)
• DIN-rail mounting

AD-SSR prices start at $39.00 (AD-SSR210-AC)

AD-70S2 Series Solid State Relays

The AD-70S2-xx series solid state relay features include:

• DIN-rail mounting (using standard mechanical relay base)
• AC Output
• Up to 4 Amp loads
• Optically isolated
• Quick connect terminal or panel mount

AD-70S2 prices start at $18.75 (AD-70S2-04B)

DIN-rail relay socket $3.75 (782-2C-SKT)

AD-SSR and AD-70S2-xx Series Solid State Relays

Available solid state relay models include the following:

• AD-SSR210-AC - Solid state DIN-rail mount relay switch with 10 A contact rating. Coil voltage 90-280 VAC.
  Load voltage is 24-280 VAC. Finger-safe design and LED status lamp.
  
  
• AD-SSR225-AC - Solid state DIN-rail mount relay switch with 25 A contact rating. Coil voltage 90-280 VAC.
  Load voltage is 24-280 VAC. Finger-safe design and LED status lamp.
  
  
• AD-SSR210-DC - Solid state DIN-rail mount relay switch with 10 A contact rating. Coil voltage 3-32 VDC.
  Load voltage is 24-280 VAC. Finger-safe design and LED status lamp.
  
  
• AD-SSR225-DC - Solid state DIN-rail mount relay switch with 25 A contact rating. Coil voltage 3-32 VDC.
  Load voltage is 24-280 VAC. Finger-safe design and LED status lamp.
  
  
• AD-70S2-04B - Solid state plug-in relay switch with 4 A contact rating. Coil voltage is 3-30 VDC.
  Load voltage is 24-140 VAC.
  
  
• AD-70S2-04C - Solid state plug-in relay switch with 4 A contact rating. Coil voltage is 3-30 VDC.
  Load voltage is 24-280 VAC.
  
  
• AD-70S2-04D - Solid state plug-in relay switch with 4 A contact rating. Coil voltage is 3-30 VDC.
  Load voltage is 8-50 VAC.

NOTES ON SOCKETS:
The AD-SSR series solid state relays do not require sockets.
The AD-70S2 series solid state relays use the same socket as the 782-2C series electromechanical relays (782-2C-SKT).
Order sockets separately; holding clips are included with sockets.

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