When the combination switch is installed, Combination Switch it is advisable to keep the handle in a horizontal rotation position. When selected, the rated current of the combined switch shall be equal to or greater than the sum of the load currents in the controlled circuit. When used to control the motor, its rated current is generally selected as 1.5 ~ 2.5 times times the rated current of the electric machine. The On-off ability of the combination switch is low, so it can not be used to break the fault current. When the motor is used to control the reversible operation, the electric motor must be completely stopped rotation before allowing the reverse connection. Combination Switch When the load factor is low, the capacity of the combined switch should be reduced, otherwise it will affect the service life.