ATS is automatic activated by municipal electricity signal or upon client’s request and is automatically put into operation. After electricity is recovered, unit will monitor for 30 seconds (adjustable) before automatically sending shutdown signal. Self-shutdown of unit is performed after maintenance, which enables full-automatic and unattended operation with the possibility of manual operation. When city power be failure, generator set will starting automatically, then generator set providing power for loading system; when city power comes back, city power providing power for loading system, then generator set will stop automatically. GB POWER providing two choices for ATS, by SOCOMEC or GB POWER own brands, both of them belong to reliability.