SERVOMAX make 3-Amorphous Core Isolation Transformers 50 Hz or 1 KHz with primary Voltage 360-480V & Secondary voltage 380-415 Volts, 120240 Volts or as required, Oil immersed, naturally air cooled, double wound with Aluminium Copper, Step up Step down core type continuous duty transformers having no load voltage ratio from 200 VA to 160 KVA with "H" Class Insulation and designed to withstand Short Circuit, & Impulse Test in accordance with IS