TNS series AC. Automatic Voltage Regulator, three phase TNS series AC. Automatic Voltage Regulator1. three phase2. with Bypass system3. Input: AC260-430V, AC276V-430V4.Output:380V5: Frequency:50/60HZTNS-1.5KVA, TNS-3KVA, TNS-4.5KVA, TNS-6KVA, TNS-9KVA, TNS-15KVATNS-20KVA, TNS-30KVA, TNS-40KVA< TNS-60KVA, TNS-90KVA