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 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 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 switch is turned off when the load current passes through the zero point of its cycle.
Solid state relays have features which electro-mechanical 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 Relays 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-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 AutomationDirect offers thousands of industrial automation products through its Online Superstore and 1,900-page catalog.
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