| Solid State Relays | Electromechanical Relays | |
| Noise | No Noise | Noise due to contact switching |
| EMI | No EMI as no switching is involved | EMI due to arcing during switching |
| Zero Voltage switching | Possible | Not Possible |
| Resistance to shock | They are resistant to shock and vibration | These relays can be affected by shock and vibration. |
| Temperature sensitivity | Sensitive to Temperature | less sensitive to temperature |
| Heat Generation | Heat is generated due to higher resistance | Low resistance in the contacts. Hence, less heat is produced |
| Heat dissipation | Heat Sink is required | Heat sink is not required. |
| Leakage Current | Solid State Relays do not completely turn off. There is a slight leakage Current. This can affect downstream circuits. | No leakage current. The relays can be completely switched on or off. |
| Lifetime | very long lifetimes. | Relatively short lifetime |
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