Switch

A heat exchange flow channel is arranged in a switch body, the outlet end of the heat exchange flow channel is communicated with a cooling fan arranged on the switch body, outer heat exchange fins are arranged on the inner side of the heat exchange flow channel, and inner heat exchange fins are arranged on the outer side of the heat exchange flow channel. During use, heat of the heating element is conducted to the outer heat exchange fins through the heat exchange flow channels, the heat of the outer heat exchange fins is transmitted out through the heat exchange flow channels under the action of the cooling fan, and then heat dissipation is achieved. Heat of air in the exchanger body is exchanged through the inner heat exchange fins, the heat is conducted to the heat exchange flow channels for heat dissipation, the heat exchange efficiency is greatly improved, and the heat exchange flow channels greatly prevent external air from entering the exchanger body to cause dust accumulation and avoid short circuit o