Sometimes we see the same model but different chains for explosion-proof chain hoists.

Why is this? What affects the number of chains for explosion-proof chain hoists.

Why are the chain numbers of explosion-proof chain hoists different

In fact, the number of chains used for explosion-proof chain hoists varies depending on the tonnage of the crane. 

A ton of explosion-proof chain hoists only use one chain; 

A three ton explosion-proof chain hoist is connected by a hook frame at the connection of the lower hook, using two chains. 

When used, both chains are also used simultaneously. 

This explosion-proof chain hoist can also pull only one chain, but its lifting capacity is only 1.5 tons. 

Using a single chain is more energy-efficient than using a double chain, but its lifting capacity is only half of the original lifting capacity, so explosion-proof chain hoists of more than two tons are basically operated by two chains simultaneously.

The above is the reason summarized by the editor for you, hoping to be helpful to you.