The plug to suit the 408/3 is a
409/3.

Please go to the website via the following links below and check under the Documentation Tab for more information.
Australia - https://www.clipsal.com/products/detail?CatNo=409/3&itemno=409/3-WE&backto=/search?q=409/3&tab-document-1=0
New Zealand - https://www.pdl.co.nz/products/detail?CatNo=409/3&itemno=409/3-WE&backto=/search?q=409/3&tab-document-1=0