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I’ve been told this by Robin from Dehn.It really depends on the SPD whether it needs an OCPD.
Its my understanding that SPDs are designed to fail open circuit. Pretty sure they are manufactured with a small soldered joint which is spring loaded, this is designed to melt under high fault currents and break the contact.
However Kirsty from surge protection devices says the opposite.
Both sit on the jpel/64 section D apparently.....
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Do it anyway hahaI was going to look inside one, to see exactly what is inside, but can't seem to open the plastic casing without risking damaging it (it is in a new Fusebox CU yet to be installed).