Solid State Relays
A solid state relay switch 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
Solid State Relays Overview 
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AD-SSR Series
AD-70S2 Series
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AD-SSR Series Solid State Relays
- AC & DC Input, AC Output
- 10 or 25 Amp loads
- Isolated zero voltage switching
- Internal RC (snubber) network
- RFI suppression
- Integral safety cover and heatsink
- DIN-rail mounting (does not require socket)
AD-SSR210-AC - Solid State DIN Mount Relay 10A VAC -
$41.00
AD-SSR225-AC - Solid State DIN Mount Relay 25A VAC -
$47.75
AD-SSR210-DC - Solid State DIN Mount Relay 10A VDC -
$32.75
AD-SSR225-DC - Solid State DIN Mount Relay 25A VDC -
$45.75
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AD-70S2 Series Solid State Relays
- AC Output
- Up to 4 Amp loads
- Optically isolated
- Quick connect terminal or panel mount
- DIN-rail mounting with relay socket base (order separately)
AD-70S2-04B - Solid State Plug-in Relay 24-140VAC -
$19.75
AD-70S2-04C - Solid State Plug-in Relay 4A 24-280VAC -
$19.75
AD-70S2-04D - Solid State Plug-in Relay 4A 8-50VAC -
$20.00
782-2C-SKT - DIN-rail socket for 782 and AD-70S2 series relays -
$4.00
33-796-1 - Bus Bar Connector (5 PAIR) -
$3.25
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For more details, select the "Products" tab and click on the desired "Item Code", or select the "Technical Info" tab.
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