NotePlease select the correct input voltage on the back of the transformer before using (110V in US). The transformer only converts the voltage, not the frequency hz. If your appliance is not compatible with 50/60hz, it will have an effect on the usage effect.
Dual circuit breakerWhen products are connected to the converter and when poweris ON, during that time if circuit breaker opens the circuit that means the converter is over loade with too many appliances. Connecting too many appliances to the transformer draws too much power that cause the circuit breaker to open the circuit.