(1) An assignment of any compensation payable under this Act is void as against the Commonwealth.
(2) Except as provided by this Act, an amount payable by an employee or a dependant of a deceased employee to the Commonwealth shall not be set off against the amount of any compensation payable under this Act to the employee or for the benefit of the dependant.
(3) Except as provided by the Maintenance Orders (Commonwealth Officers) Act 1966 , the Child Support Act 1988 or the Social Security Act 1991 , or by, or by regulations under, the Family Law Act 1975 , any compensation payable under this Act is not subject to attachment.