Double-bus switching operation auxiliary contact-shared circuit

The invention belongs to the field of double-bus electrical control and relates to a double-bus switching operation auxiliary contact-shared circuit. According to the double-bus switching operation auxiliary contact-shared circuit of the invention, monitoring relays are additionally arranged at the power supply sides of two control power source loops respectively; and the closing contacts of knifeswitches are additionally arranged at the N ends of a bus switching operation interlocking loop common contact, and therefore, the two power supplies can be effectively isolated when power supply sides fail. With the double-bus switching operation auxiliary contact-shared circuit of the invention adopted, when one power supply fails, the power supply can be effectively isolated from the other power supply, and therefore, connection between the two power supplies is avoided, and at the same time, a parasitic loop can be avoided, potential safety hazards are eliminated, and electrical interlocking is realized. 本发明涉及双母线