A transfer switch is an electrical system that switches a load between two sources - typically used to activate a backup generator during a power cut.
Some transfer switches are manual, in that an operator effects the transfer by throwing a switch, while others are automatic and switch when they sense one of the sources has lost or power.
There are basically two types of transfer switches to consider and Energy Generators always recommend that transfer switches be installed by a qualified electrician.
1) Manually operated panels allow a generator to be plugged in to provide power when needed, they can then be switched back to mains power when required.
The following info shows how the process works - To transfer to generator, 1. Leave the transfer switch in the mains power position. 2. Start the generator and allow it to properly warm up. 3. Once the generator engine is warmed up move the transfer switch to the generator position, power will now be supplied by the generator. When the power returns from the mains the sequence of events is reversed and you simply move the transfer switch back o the mains position. After the generator engine has run with no-load and cooled down for approximately 5-minutes shut the generator engine down.
2) Automatic transfer switches have a control circuit that senses the interruption of mains power and turns on the generator; then it turns the generator off and switches it back to utility power when the mains problem is resolved. This allows all the functions needed to go from mains power to generator power and back, without any intervention by a person. If you are often away from home working, leaving your family and children at home alone, then opt for an automatic system.
Three phase systems should always use automatic transfer switches because they include in-phase monitoring controls that prevent power transfers when the transfer will damage a out-of-phase equipment.
