Just been working on how I'm going to wire up my control box, and was wondering if a solid state relay would be upto switching the 625VA toroidal transformer.

Had a quick look on RS, and part no. 346-918 is rated at 25A continous, with a surge rating of 250A.
What kind of surge rating would be needed for switching a Toroidal?

Main reason for wanting to use a Solid State Relay, is I plan on switching it from the E-stop circuit (hitting an e-stop will kill power to the main transformer, and trigger the e-stop signal to the breakout board, while the 5v control supply is kept live).
Being able to switch the transformer direct from 5v will eliminate the need for an extra booster relay to switch the transformer, as I can't find any 5v relays capable of switching the transformer direct.