The utility model provides an install electrified blocking element's isolating cabinet handcart additional, it includes the cabinet body, and be located the internal relay instrument room of cabinet, circuit breaker handcart room, bus -bar room and cable chamber, the isolated wheelbarrow homophase both ends in circuit breaker handcart room install a looks PT additional, and this PT secondary side causes the electromagnetic lock. Adopt above -mentioned technical scheme the utility model discloses, install PT additional at isolated wheelbarrow homophase both ends, the PT secondary side causes the electromagnetic lock, as the operation of electric locking handcart, loses the electrolysis lock like this, has effectively guaranteed the security and the reliability of work.