Medium-pressure reactive compensation real-time multi-stage switching circuit breaker

The invention belongs to an electric power device, especially relates to a circuit breaker used for switching a medium voltage reactive power compensation device. A medium voltage reactive power compensation multi-grade switching circuit breaker includes a sulfur hexafluoride circuit breaker (KS) which connects a medium voltage circuitry or bus and controls switching of a plurality of branchs, wherein one of the branchs is directly connected with a peripheral compensation capacitor (C0), and each of the other branchs is serially connected to a current limiting reactor (L1, L2) and an electric grounding guillotine (K1, K2) which are connected with a peripheral compensation capacitor (C1, C2). The invention has a plurality of work states, is capable of controlling combination switching of a plurality of peripheral compensation capacitors to realize reactive power compensation of multi-grade, thereby satisfying an adjusting request of medium voltage reactive power compensation. The fixedly connected peripheral compensation capacitors can adsorb over-voltage generated when the other branchs is turned-off, and the current limiting reactors provided in the other branchs can restrain bad surge current generated when the capacitors are closed to protect the electric power device.