Transformer fuses for Primary and Secondary
Your output is only drawing about 3.4A maximum assuming your accounting for start-up current, so if your goal is to protect the motors, a 4 or 5A fuse, if your protecting the transformer, a 10A fuse on the secondary, slow blow is more needed when both the motor maximum and the transformer maximum are close, e.g. all 4 motors spinning up at the same time, the transformer under say a 50% overload will not burn out faster than the fuse, so a slow fuse is selected for the short spinup period. 

Input fuse about 2A conventional.