A protection apparatus, comprising: a one-way transient voltage suppressor TVS, wherein a negative electrode of the one-way TVS is to be connected to a positive electrode of a power supply, and a positive electrode of the one-way TVS is to be connected to a negative electrode of the power supply; and a switching type protector, wherein the switching type protector is arranged such that, in use, it is connected between the one-way TVS and the positive electrode of the power supply or between the one-way TVS and the negative electrode of the power supply, wherein when a power supply port is affected by a surge from the positive electrode to the negative electrode, the switching type protector and the one-way TVS are conducted, so as to shunt a surge current, and the one-way TVS clamps a surge voltage at two ends of the one-way TVS to a clamping voltage, and when the power supply port is affected by a surge from the negative electrode to the positive electrode, the switching type protector and the one-way TVS are conducted, so as to shunt the surge current; the protection apparatus further comprising: a decoupler, wherein the decoupler is arranged such that, in use, it is connected between the power supply port and a protected device in series, and a second clamping type protector, wherein the second clamping type protector is arranged such that, in use, it is connected to the protected device in parallel, wherein the decoupler is connected to the second clamping type protector and, in use, to the protected device in series, a branch circuit in which the decoupler and the second clamping type protector are located is connected in parallel to a branch circuit in which the switching type protector and the one-way TVS are located; a first clamping type protector, wherein the switching type protector is connected to the first clamping type protector and the one-way TVS in series, and the first clamping type protector is connected to the one-way TVS in parallel, so as to shunt the surge current, characterized in that the first clamping type protector is a metal oxide varistor a one-way transient voltage suppressor TVS, wherein a negative electrode of the one-way TVS is to be connected to a positive electrode of a power supply, and a positive electrode of the one-way TVS is to be connected to a negative electrode of the power supply; and a switching type protector, wherein the switching type protector is arranged such that, in use, it is connected between the one-way TVS and the positive electrode of the power supply or between the one-way TVS and the negative electrode of the power supply, wherein when a power supply port is affected by a surge from the positive electrode to the negative electrode, the switching type protector and the one-way TVS are conducted, so as to shunt a surge current, and the one-way TVS clamps a surge voltage at two ends of the one-way TVS to a clamping voltage, and when the power supply port is affected by a surge from the negative electrode to the positive electrode, the switching type protector and the one-way TVS are conducted, so as to shunt the surge current; the protection apparatus further comprising: a decoupler, wherein the decoupler is arranged such that, in use, it is connected between the power supply port and a protected device in series, and a second clamping type protector, wherein the second clamping type protector is arranged such that, in use, it is connected to the protected device in parallel, wherein the decoupler is connected to the second clamping type protector and, in use, to the protected device in series, a branch circuit in which the decoupler and the second clamping type protector are located is connected in parallel to a branch circuit in which the switching type protector and the one-way TVS are located; a first clamping type protector, wherein the switching type protector is connected to the first clamping type protector and the one-way TVS in series, and the first clamping type protector is connected to the one-way TVS in parallel, so as to shunt the surge current, a decoupler, wherein the decoupler is arranged such that, in use, it is connected between the power supply port and a protected device in series, and a second clamping type protector, wherein the second clamping type protector is arranged such that, in use, it is connected to the protected device in parallel, wherein the decoupler is connected to the second clamping type protector and, in use, to the protected device in series, a branch circuit in which the decoupler and the second clamping type protector are located is connected in parallel to a branch circuit in which the switching type protector and the one-way TVS are located; a first clamping type protector, wherein the switching type protector is connected to the first clamping type protector and the one-way TVS in series, and the first clamping type protector is connected to the one-way TVS in parallel, so as to shunt the surge current,