The utility model provides a pole-mounted circuit breaker. The pole-mounted circuit breaker comprises an insulating pole and a mechanism box body, the insulating pole comprises a vacuum arc-extinguishing chamber, a flexible connection structure, a conducting rod and a current sensor which are integrally cast, a moving contact of the vacuum arc-extinguishing chamber is electrically connected with the conducting rod through the flexible connection structure, and the current sensor is arranged around the conducting rod; the insulating pole is installed on the mechanism box body, and the moving contact is in driving connection with a mechanism in the mechanism box body through an insulating pull rod. According to the utility model, the current sensor, the voltage sensor and the power taking capacitor are integrated, and the traditional current transformer is replaced by the current sensor, so that the size is reduced, and the precision is improved; the voltage sensor can accurately measurethe voltage on a line, and the problem that a conventional insulating pole cannot acquire a voltage signal is solved; and the electricity taking capacitor can directly take electricity.