A module for a high voltage electronic circuit breaker that includes a power supply and related circuitry for suppressing high voltage transients. The power supply receives a range of voltages, such as up to 600V, and is powered from the line current instead of through a transformer, exposing the module electronics to potential voltage transients. A large capacitor is connected to the high voltage input for absorbing the energy of a voltage transient. Transient voltage suppressors are connected in parallel to the capacitor to absorb any further energy in the transient not absorbed by the capacitor. Inductors are series-connected with the high voltage input to present an impedance and inductance to the voltage transient, reducing the transient before it reaches the power supply. Inductors in the trip coil and the indicator coils also present an impedance and inductance to the transient, further enhancing protection against transients. Fuses connected in line with the high voltage input protect the module electronics against short circuits.