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TH-B Electric chain hoist Aluminum body, which improve anti-corrosion and heat dissipation. Small volume and light weight. Double clutch, which can provide load limition(1.25 times of capacity) Up and down limition device Cooling fan motor has unique radiating fin and fan cover can provide rapid heat dissipation of motor, and guarantee the hoist can be operated continously. The hoist employs 10:1 speed ratio motor. The frequency transformer is available at extra cost, which enable stepless speed requlation.