user28569: Need to find a DPST relay that is 'Arduino' friendly and that is capable of 30A at 240VAC. Anyone can share links ?
Not looking for recommendation, just ideas on what you saw or used in the past.
Thanks.

user359: A relay that can switch 30A on mains voltage is not going to be able to switch directly from 5V. Getting something that can switch from 24V is much more realistic.
High amp relays are often called contactors. 4-pole ones are not uncommon for industrial motor applications. 3 high-amp poles are for 3-phase power and a low-amp one for a control signal.
You can buffer up the signal using a transistor (you'd need one anyway to supply the coil amps) or another relay. 

user37622: Do not be scared from other answers. There are relays which hold the coil with 5 V from Arduino. Like the relay on this Grove 30 A Relay Module. It is powered from 5 V pin and the command to close is from the GPIO pin (works with 3.3V IO too). 
Use two of these SPDT modules, if you can't find DPST powered with 5 V.
If you will use the Grove module and you do not use other Grove modules, there is no need to buy the Grove base shield. You can connect the module with this cable. 

28569: <p>Need to find a DPST relay that is 'Arduino' friendly and that is capable of 30A at 240VAC. Anyone can share links ?</p>

<p>Not looking for recommendation, just ideas on what you saw or used in the past.</p>

<p>Thanks.</p>
 359: <p>A relay that can switch 30A on mains voltage is not going to be able to switch directly from 5V. Getting something that can switch from 24V is much more realistic.</p>

<p>High amp relays are often called contactors. 4-pole ones are not uncommon for industrial motor applications. 3 high-amp poles are for 3-phase power and a low-amp one for a control signal.</p>

<p>You can buffer up the signal using a transistor (you'd need one anyway to supply the coil amps) or another relay. </p>
 37622: <p>Do not be scared from other answers. There are relays which hold the coil with 5 V from Arduino. Like the relay on this <a href="https://www.seeedstudio.com/Grove-SPDT-Relay%2830A%29-p-1473.html" rel="nofollow noreferrer">Grove 30 A Relay Module</a>. It is powered from 5 V pin and the command to close is from the GPIO pin (works with 3.3V IO too). </p>

<p>Use two of these SPDT modules, if you can't find DPST powered with 5 V.</p>

<p>If you will use the Grove module and you do not use other Grove modules, there is no need to buy the Grove base shield. You can connect the module with <a href="https://www.seeedstudio.com/Grove-4-pin-Male-Jumper-to-Grove-4-pin-Conversion-Cable-%285-PCs-per-Pack%29-p-1565.html" rel="nofollow noreferrer">this cable.</a>  </p>
