There are seven models in the DHB series eddy current retarder. Suitable for long-distance and tourist buses with rear gearboxes. The stator is made of aerospace die-cast aluminum alloy, which is anti-magnetization, high strength, light weight and good size stability. The rotor is made of special high-temperature resistant alloy casting, with small deformation and no remanence; the heat dissipation channel adopts a multi-layer structure, which has large ventilation and small thermal decay.