Solid state relays (SSRs) are commonly driven by TTL or buffered CMOS logic gates. When using logic drive, an input resistor is usually required to limit current through the control LED to a recommended value. The recommended operating current for most SSRs is between 1 mA and 20 mA depending upon the application.2 Jul 2012
How does a solid state relay works?
A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. It serves the same function as an electromechanical relay, but has no moving parts and therefore results in a longer operational lifetime.
How do you connect a relay to a circuit?
https://www.youtube.com/watch?v=zt0BihY1s9Y
Do solid state relays need a diode?
If the relay is on the same board as whatever is driving it, then no inductive kickback diode is needed. It's no different than driving any other on-board LED. However, there can be inductance in the circuit from other than the relay.15 Dec 2012
When would you use a solid state relay?
A solid state relay is ideal when fast, frequent switching is required. For example, precision temperature control of an industrial oven might require switching off the mains supply to the heating elements every two or three seconds.
Does a solid state relay need a load to work?
Solid State Relay Output Waveform With no input signal applied, no load current flows through the SSR as it is effectively OFF (open-circuited) and the output terminals see the full AC supply voltage.
How do solid state relays fail?
If an ambient temperature exceeds the rated value, the SSR output elements may be damaged. If the SSR is used with loose screws of its output terminals or imperfect solder, abnormal heat generation while current flowing causes the SSR to burn out. Perform the proper wiring and soldering.
What is the difference between a relay and a solid state relay?
The main difference between solid state relays and general relays is that there is no movable contacts in solid state relay (SSR). Thus, SSR have a wide range of features that mechanical relays do not have. The most significant feature of SSR is that they do not employ switching contacts that will wear out physically.9 Apr 2020
How do you power a solid state relay?
Packaged solid-state relays use power semiconductor devices such as thyristors and transistors, to switch currents up to around a hundred amperes. Solid-state relays have fast switching speeds compared with electromechanical relays, and have no physical contacts to wear out.
Is a solid state relay an inductive load?
An SSR used with an inductive load can accidentally fire due to a high load voltage rise rate (dv/dt), even though the load voltage is below the allowable level (inductive load firing). Our SSRs contain a snubber circuit designed to reduce dv/dt (except AQ-H).
What causes SSR to fail?
If an ambient temperature exceeds the rated value, the SSR output elements may be damaged. If the SSR is used with loose screws of its output terminals or imperfect solder, abnormal heat generation while current flowing causes the SSR to burn out.
How do I connect my solid state relay?
Solid State Relay (DC/DC): Connect (R) positive terminal to the push button switch. Connect (R) negative terminal to the negative terminal on battery 1. Connect (L) positive terminal to the positive terminal on battery 2. Connect (L) negative terminal to the positive terminal on load.