Looking for link to Double Pole Single Throw (DPST) relay for Arduino 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.
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.