Interruttore Trasferimento Manuale Automatico per ATS Doppia Potenza 110V con Protezione Sovratensione

When the primary power source (I) is normal, the IU (green light) illuminates steadily. When the primary power source (I) experiences an abnormality, the IU (green light) turns off and switches to the automatic power source (II) within 0.05 seconds, with the IIU (red light) illuminating.

eBay