Instructions for use 2P MTS: 1.When the handle hits the I position: 1 and 2 are connected 5 and 6 are connected. 2.When the handle hits the II position: 1 and 4 are connected 5 and 8 are connected. 3.When the handle is in the middle position: both groups are disconnected. 4P MTS: 1.When the handle hits the I position: 1 and 2 are connected 5 and 6 are connected 9 and 10 are connected 13 and 14 are connected. 2.When the handle hits the II position: 1 and 4 are connected 5 and 8 are connected 9 and 12 are connected 13 and 16 are connected. 3.When the handle is in the middle position: both groups are disconnected. The position of the incoming and outgoing wires can be adjusted according to actual needs (the upper and lower out are not necessarily required, when used for dual power switching, the lower in and upper out must be used.)