Technical and constructional features degree of protection IP 54 insulation class:F line voltages for three phase motors at 50/60Hz: 380V / 415V for powers up to 7.5Kw for single phase motors at 50 /60Hz: 230 V The allowed voltage variation is + 10% according to IEC 38 Specification. For any other voltage at 50 Hz and for any voltage at 60 Hz, a 5% tolerance on supply voltage is allowed, in accordance with IEC 34 Specification