Basics for protection against transient voltages

Any voltage exceeding the maximum permissible voltage, could potentially damage a Solid State Relay. If overvoltage conditions are likely to occur (e.g., lightning, voltage spikes from turning off inductive loads like motors and transformers, …), the outputs of the SSRs require an overvoltage suppression device. 

It is why celduc® relais recently launched a complete range of Solid State Relays with built-in TVS protection, suitable for standard industrial loads.