Ferroresonance is a phenomenon that arises because it is triggered by a transient condition such as a switching, lightning strike, or short circuit disturbance. This phenomenon produced an abnormal form of voltage and overcurrent. It is caused by a non-linear inductance component (L), resistance component (R) and the capacitance (C) is constant in a system. In this study, the design and implementation of a ferroresonance test module on a low-voltage 3-phase transformer are made to physically analyze the small-scale ferroresonance phenomenon based on conditions in the system/field. The test results show that the design of the test module that is made can function correctly. The test module can produce a ferroresonance response in a 3-phase transformer with H and M cores. H and M cores are types of iron cores from the transformer used in this study. The test is carried out by increasing the power supply voltage until it reaches the transformer voltage rating and then varying the phase discharge and capacitor value to raise a ferroresonance response. The phased release variation is the release of 1 phase and 2 phases with capacitors variations of 10μF, 20 μF, and 30μF in series and series-parallel configurations. The ferroresonance response of the voltage wave obtained in the series-parallel configuration produced a more distorted wave than the series. Based on the test results, when testing with various capacitors, the greater the value of the capacitor, the greater the voltage required to generate the ferroresonance response, and Cseries has a more dominant influence than Cparallel. It takes a more significant value of the series capacitor (Cseries) to reduce the power supply voltage needed to get a ferroresonance response with a decrease of up to 28%.