A pluggable surge protection device comprising: a base with a mounting opening, a pressing plate and a micro switch being arranged in the base, the micro switch being located beneath the pressing plate; at least one pluggable module mounted to the base through a positioning mechanism, the at least one pluggable module being mounted in the mounting opening, each pluggable module comprising: a shell with a mounting bracket formed therein, an indication window being formed on the top of the shell; a first contact piece and the second contact piece mounted in the shell for electrical connection; a non-linear protection element mounted in the shell, a first pin of the non-linear protection element being connected with the first contact piece, a second pin of the non-linear protection element being connected with the second contact piece through an intermediate conductor, wherein the intermediate conductor and the second pin are connected through a low-melting-point alloy; a releasing lever connected to a first spring, the releasing lever being linked with the intermediate conductor, the releasing lever comprising a lower extension portion; an indication component mounted on the top of the shell, the indication component moving horizontally and indication component being connected to a second spring, the second spring being mounted between the indication component and the shell; wherein when the non-linear protection element works normally, the second pin is electrically connected with the second contact piece through the intermediate conductor, the releasing lever is supported by the intermediate conductor, the first spring is compressed, the indication component is restricted by the releasing lever to be aligned with the position of the indication window, and the second spring is compressed; when the non-linear protection element works abnormally and causes a rise in temperature, the low-melting-point alloy is softened, the first spring is released and pushes the releasing lever and the intermediate conductor to move, the electrical connection is cut off; the lower extension portion contacts the pressing plate, which triggers the micro switch; the releasing lever is no longer restricting the indication component, and the second spring is released and pushes the indication component to move away from the position of the indication window. a base with a mounting opening, a pressing plate and a micro switch being arranged in the base, the micro switch being located beneath the pressing plate; at least one pluggable module mounted to the base through a positioning mechanism, the at least one pluggable module being mounted in the mounting opening, each pluggable module comprising: a shell with a mounting bracket formed therein, an indication window being formed on the top of the shell; a first contact piece and the second contact piece mounted in the shell for electrical connection; a non-linear protection element mounted in the shell, a first pin of the non-linear protection element being connected with the first contact piece, a second pin of the non-linear protection element being connected with the second contact piece through an intermediate conductor, wherein the intermediate conductor and the second pin are connected through a low-melting-point alloy; a releasing lever connected to a first spring, the releasing lever being linked with the intermediate conductor, the releasing lever comprising a lower extension portion; an indication component mounted on the top of the shell, the indication component moving horizontally and indication component being connected to a second spring, the second spring being mounted between the indication component and the shell; a shell with a mounting bracket formed therein, an indication window being formed on the top of the shell; a first contact piece and the second contact piece mounted in the shell for electrical connection; a non-linear protection element mounted in the shell, a first pin of the non-linear protection element being connected with the first contact piece, a second pin of the non-linear protection element being connected with the second contact piece through an intermediate conductor, wherein the intermediate conductor and the second pin are connected through a low-melting-point alloy; a releasing lever connected to a first spring, the releasing lever being linked with the intermediate conductor, the releasing lever comprising a lower extension portion; an indication component mounted on the top of the shell, the indication component moving horizontally and indication component being connected to a second spring, the second spring being mounted between the indication component and the shell; wherein when the non-linear protection element works normally, the second pin is electrically connected with the second contact piece through the intermediate conductor, the releasing lever is supported by the intermediate conductor, the first spring is compressed, the indication component is restricted by the releasing lever to be aligned with the position of the indication window, and the second spring is compressed; when the non-linear protection element works abnormally and causes a rise in temperature, the low-melting-point alloy is softened, the first spring is released and pushes the releasing lever and the intermediate conductor to move, the electrical connection is cut off; the lower extension portion contacts the pressing plate, which triggers the micro switch; the releasing lever is no longer restricting the indication component, and the second spring is released and pushes the indication component to move away from the position of the indication window.