What does a transfer switch do and why is it necessary?

    A transfer switch creates a safety connection between your generator, the utility company, and your business during power outages.  It is required by law in all 50 states.

When should a SERVICE ENTRANCE RATED (SER) transfer swtich be used?

    If an automatic transfer switch is required to carry the entire load of a facility, SER equipment must be installed to comply with NFPA 70 requirements.

What is the difference between an automatic transfer switch and a manual transfer switch?

    With an automatic transfer switch (ATS), everything is fully automated.  During a power outage, the ATS connects the facility to the generator and transfers the power.  When utility power is restored, the ATS will reverse this connection.  On the other hand, the manual transfer switch (MTS) requires action by the user.  The generator will need to be started, the MTS will need to be connected, and the facility power will need to be switched over.  When the utility power is restored, everything will need to be manually reversed by the user.