The protector from the voltage supply side directly into L1, L2, L3 and the load side of the x, y, z, one to 3 PTC thermistor, the Rtrip is generally 12K, Rreset is generally 3K, the terminal of T1 and T2 is the control voltage input port.

As module working voltage is from power supply, the module can be detected and protected in real time. Hence, once supply voltage is applied, it can detect power system faults such as phase sequence, static phase loss, overvoltage or undervoltage, phase unbalance etc, unlike like the third generation protection module where detection only happens after the application of a power supply. As such, if inverse phase or loss phase occurs in the power system, it may also stop the motor after first letting the motor to reverse or locked rotor again. However short-time inversing running may lead to motor burnout.