Installing EVSE with a Shunt Trip.

yup.
It is just a solenoid in a box that turns the MCB or whatever off for you. Some connect to the front dolly and really do push it off like you would,  other makes link via a spindle or ram-pin  into the side of the breaker body (so for example the newer wylex CBs and RCBOs have a small screw-driver like slot in the side that can be rotated to force a trip even if the dolly is held, while some GE ones have a slot for a ram-pin to move down to do the same.)

There is little standardization sadly.

Coil voltages other than 230 are available for those who like to knock the mains off with 12V dc or whatever.

Also used with things like insulation monitoring and bespoke fault detection kit - say lost phase or off earth detection or something. Useful with power of opportunity, where you may not get the voltages you expected when the local connector is M6 wing nut or croc clips, and a prompt automatic knock off is vital .
Mike

An Internet search has turned an answer up regards the requirement for welded contact protection in EVSE.

This is a specific requirement of the Renault "Z.E. Ready" and ASEFA "EV Ready" standards (e.g. requirement for Nissan).

myenergi.nl/.../

Odd.

ZER-15_Commitment-to-Standards-and-Regulations

nor

ZE-READY1.4-requirement list

mention welded contacts.

Nor or that matter does it look as if 

EVREADY_Certification_Technical_Reference_1.4

does either

Mike