In order to solve the mal-operation problem of the mechanical switches on the intercity EMUs head cover and coupler, a new type of inductive sensor and detection circuit was designed based on electromagnetic induction principle, non-contact signal acquisition and isolation technology, which could check whether the actuating unit was in place without mechanical contact or pressure. The inconsistent problem between the instruction and the state of the position was solved effectively. The detection circuit has been applied in the intercity EMUs, which has the advantages of accurate detection and strong anti-interference ability.