What is the difference between optocoupler thyristors and solid state relays?
Solid-state relay device is optocoupler plus thyristor
SCR optocoupler is optocoupler to increase the characteristics of thyristor made of digital control equipment:
Control terminal voltage is low, low current, used for digital system control, with optical isolation, with optocoupler high isolation voltage characteristics.
After the control terminal is connected, the rear stage is turned on, and the rear stage is not cut off when the current flows in the latter stage until the controlled terminal current stops resuming until it receives the next preceding signal and has the same characteristics as the thyristor.
Solid state relays are power devices:
The control terminal voltage is higher, the current is relatively large, and more for the simulation system control, non-contact electronic switch, the isolation voltage is relatively low.
After the end of the circuit connected to the post-level, after the closure of the pre-class circuit closed.
In use, the same parameters can be common, but the thyristor generally smaller package, solid state relay larger.
Thyristor is through a digital device:
Low voltage
Low current
high speed
Small package
Solid state relays are power devices:
High voltage
High current
Slow speed
Large package
