How do I programme a CBI QAT-TRDM Electronic Time Switch? Image: The bypass function will either switch load ON or OFF until you exit this function. ON - the load will be on at all times and will not be switched according to the program. OFF - the load will be off at all times. While bypass mode is ON you will not be able to set the time or use the function operation, only ON / OFF buttons will work. A picture of a two-prong plug with a line through indicates that no power connected to the device.