10 kVA three phase 220V/380V frequency converter, easy converting 50Hz to 60Hz or 60Hz to 50Hz for three phase industrial motor machines with pure sine wave, also can change 220V to 380V/400V. $5,990.77 40 kVA Isolation Transformer, 3 phase, 240 Volt to 480 Volt. $5,893.65. SKU: ATO-T-SG40KVA. Quick View. High efficiency 30kVA solation transformer is dry type air self cooling one, which is available in the circuit of AC 50Hz/60Hz and convert 3 phase voltage 480V to 415V, step up 415V to 480V is optional, low cost and manufactured direct sale. The enclosure I have doesn't have adequate room for a transformer to create single phase 230V. 2nd part - how is the main 400V supply requirements calculated from this. For example if my 400V load for the enclosure is 45A and the 230V supply that is created has 8.5 FLA then what would the final 400V supply required for the enclosure. Re: 440V 3Ph without neutral transform to 220V AC Single phase. 05/07/2009 9:06 AM. You want to buy a transformer that has a little higher KVA rating than the loads you are going to connect. If your valve is a 3 phase monster, you will need three transformers. I suspect it only has two wires and therefore is a single phase device. Below you will find an overview of all DC/DC converters from 220V to 400V DC direct voltage. These converters are stabilized, short-circuit proof and can operate with 220V DC input voltage. Select a 400V DC DC/DC converter All DC/DC converters on this page have an output voltage of 400V DC. This voltage is adjustable for many types. By clicking on the product you can read this and other The first step is to make sure that the three-phase supply line is grounded. This will prevent the power from sagging, which could be hazardous. Before attempting a 3-phase to single-phase 220v conversion, you’ll need to consider how your machine is wired and how the current balance needs to be. I(A) = 1000 × S(kVA) / (√3 × VL-L (V)) The phase current I in amps (with balanced loads) is equal to 1000, multiplied by the apparent power S in kilovolt-amps (kVA), divided by the square root of 3, multiplied by the line to line RMS voltage VL-L in volts (V). How to convert VA to Amp. in only 1 step: Divide VA between the voltage indicated by the formula. For example a three-phase fan (3P) has a power of 1500VA with a voltage of 208V L-L, then you must divide 1500VA between the voltage 208V and root of three which will result in: 4.16Amp. (1500VA/ (208Vx√3) = 4.16Amp). xSe1MM.