What Does A Solid State Relay Do When Overloaded?

1.  Elevated Temperature:

An overload causes an increase in power loss within the SSR, which in turn causes the temperature of the relay to rise. This temperature rise may become significant if heat dissipation measures are inadequate.

2. Abnormal LED indication:

If the SSR is equipped with a status indication LED, an overload may cause the LED brightness to change or flicker, or the LED may not even light up at all.

3. Decrease in output voltage:

Under overload conditions, the output voltage of the SSR may decrease because the voltage drop across the internal semiconductor devices increases.

4. Slower Response Speed:

An overload may affect the switching speed of the SSR, slowing down its response or even preventing it from switching properly in   extreme cases.

5. Increased Electromagnetic Interference (EMI):

An overload may increase EMI, affecting the operation of other equipment in the same circuit or system.

6. Shortened Life Span:

Long-term overloading accelerates the aging of semiconductor devices inside the SSR and shortens their life span.

7. Protection Mechanism Triggering:

If the SSR is designed with built-in overload protection mechanisms, such as thermal or current protection, the overload may trigger these protection mechanisms, causing the relay to enter a protective state and stop working to prevent damage.

8. Failure and Damage:

Under severe overload or prolonged overload conditions, the SSR may fail or even cause damage to the internal semiconductor devices.

9. Increased Noise:

An overload may cause more noise to be generated inside the SSR, especially in the case of inductive or transformer loads.

10. Control Failure:

In extreme overload situations, the SSR may lose control completely and not be able to be turned on or off by the input signal.

    To avoid these situations, it is important to ensure that the SSR operates within its load rating and that proper heat dissipation measures are taken. If an SSR is suspected of being overloaded, the load conditions should be checked immediately and the necessary measures taken to mitigate the overload in order to protect the SSR and the entire system from normal operation.