Any appointing power may, without hearing or trial, preemptorily suspend any subordinate for cause for a reasonable period, not exceeding 30 days, with loss of salary or other compensation. No suspension shall be made except upon written charges served upon the accused and filed with the commission, with the privilege to the accused of serving upon the appointing power a written answer and explanation of such charges, and filing a copy of the same with the commission. No suspension made by any appointing power pursuant to this section shall be subject to review by the commission or any other tribunal. No appointing power may suspend the same subordinate more than twice, or for a total of more than 45 days, during any one year.