A surge protection device, comprising: a surge arrestor, arranged within a circuit branch connected in parallel with a load, and adapted to clamp a load voltage (V load) to a clamping voltage (V clamp) not larger than a load voltage limit (V limit) when the load voltage (V load) rises to a breakdown voltage (V A1TH) of the surge arrestor, the breakdown voltage (V A1TH) increasing with a rising rate of the load voltage (V load); and an arrestor assistor, connected in parallel with the surge arrestor within the circuit branch and adapted to make the load voltage (V load) rise to the breakdown voltage (V A1TH) not larger than the load voltage limit (V limit), wherein the arrestor assistor comprises a transient voltage suppressor diode having a clamping voltage (V CTVS) not larger than the load voltage limit (V limit) and a reverse breakdown voltage (V BRTVS) less than the clamping voltage (V CTVS), wherein the TVS diode prevents the load voltage (V load) from exceeding the clamping voltage (V CTVS) and thus suppresses the rising rate of the load voltage (V load) when the load voltage (V load) rises to the reverse breakdown voltage (V BRTVS), and characterized by a semiconductor switch connected in series with the TVS diode, wherein the semiconductor switch is turned off when the load voltage (V load) rises to the breakdown voltage (V A1TH) of the surge arrestor and is turned on when the load voltage (V load) drops to a normal operation voltage (V NORMAL) not larger than the clamping voltage (V clamp). a surge arrestor, arranged within a circuit branch connected in parallel with a load, and adapted to clamp a load voltage (V load) to a clamping voltage (V clamp) not larger than a load voltage limit (V limit) when the load voltage (V load) rises to a breakdown voltage (V A1TH) of the surge arrestor, the breakdown voltage (V A1TH) increasing with a rising rate of the load voltage (V load); and arranged within a circuit branch connected in parallel with a load, and adapted to clamp a load voltage (V load) to a clamping voltage (V clamp) not larger than a load voltage limit (V limit) when the load voltage (V load) rises to a breakdown voltage (V A1TH) of the surge arrestor, the breakdown voltage (V A1TH) increasing with a rising rate of the load voltage (V load); and an arrestor assistor, connected in parallel with the surge arrestor within the circuit branch and adapted to make the load voltage (V load) rise to the breakdown voltage (V A1TH) not larger than the load voltage limit (V limit), wherein the arrestor assistor comprises a transient voltage suppressor diode having a clamping voltage (V CTVS) not larger than the load voltage limit (V limit) and a reverse breakdown voltage (V BRTVS) less than the clamping voltage (V CTVS), wherein the TVS diode prevents the load voltage (V load) from exceeding the clamping voltage (V CTVS) and thus suppresses the rising rate of the load voltage (V load) when the load voltage (V load) rises to the reverse breakdown voltage (V BRTVS), and characterized by a semiconductor switch connected in series with the TVS diode, wherein the semiconductor switch is turned off when the load voltage (V load) rises to the breakdown voltage (V A1TH) of the surge arrestor and is turned on when the load voltage (V load) drops to a normal operation voltage (V NORMAL) not larger than the clamping voltage (V clamp). connected in parallel with the surge arrestor within the circuit branch and adapted to make the load voltage (V load) rise to the breakdown voltage (V A1TH) not larger than the load voltage limit (V limit), wherein the arrestor assistor comprises a transient voltage suppressor diode having a clamping voltage (V CTVS) not larger than the load voltage limit (V limit) and a reverse breakdown voltage (V BRTVS) less than the clamping voltage (V CTVS), wherein the TVS diode prevents the load voltage (V load) from exceeding the clamping voltage (V CTVS) and thus suppresses the rising rate of the load voltage (V load) when the load voltage (V load) rises to the reverse breakdown voltage (V BRTVS), and characterized by a semiconductor switch connected in series with the TVS diode, wherein the semiconductor switch is turned off when the load voltage (V load) rises to the breakdown voltage (V A1TH) of the surge arrestor and is turned on when the load voltage (V load) drops to a normal operation voltage (V NORMAL) not larger than the clamping voltage (V clamp).