When power is applied to both GMT inputs the load is equally shared. If either input A or B is shut off, the entire power to both sides will be supplied by the remaining input. The grounds for side A and side B must be ganged together to allow both sides to operate from either input. Maximum current for either side is 30Amps. Input power required for either side must be capable of the total power required for Side A and Side B combined (60Amps Max.)