1. With a built-in protector, the motor turns off automatically when overheated or when the three-phase mains loses a phase, so as to protect the motor from burning out;

2. The gear is made of chromium-manganese-titanium alloy steel, with carbonitriding on the surface, which can prolong life span greatly;

3. To ensure endurable use in the sea water or highly erosive industrial waste, engineering plastic impeller and stainless steel impeller are developed according to the requirements of varied usage environments and specific demands of users, eliminating the need of frequent change of impellers or painting.