The utility model relates to the technical field of circuits, and discloses a circuit for terminal phase sequence protection, which is characterized by comprising a phase sequence protector and an intermediate
relay, L1, L2 and L3 terminals of the phase sequence protector are respectively connected with A phase, B phase and C phase of a three-phase power supply, the L1 terminal of the phase sequence protector is connected with a No.11 pin of the phase sequence protector, and the L2 terminal of the phase sequence protector is connected with a No.12 pin of the phase sequence protector. A No.12 pin of the phase sequence protector is connected with a coil A1 of the intermediate
relay through a power line, and a coil A2 of the intermediate
relay is connected with an N phase of the three-phase power supply. When the phase sequence protection device is used, a power line of equipment with phase sequence protection requirements is connected to the wiring terminal strip, so that when the
equipment supplies power, as long as the phase sequence is wrong, the phase sequence protector works, the normally-closed auxiliary contact is disconnected, the intermediate relay loses power, and the
electrical equipment with the phase sequence requirements is controlled to be powered on and off, the
contactor cannot be closed; therefore, a phase sequence protection function is realized.