What size breaker do I need for a 45 kVA transformer?
For a 45kVA transformer, 125A×1.25=156A, so use a 175A protection device.
How many kVA is a 200 amp service?
With your load single phase of 200 amps at 240 volts (which is what you have coming into you home) gives you 48 KVA. This means that a 50 KVA should work.2014-12-01
How do you calculate the amp output of a transformer?
Divide the wattage by the voltage. For example, if you have a 300-watt lighting transformer and you are going to hook it up to a standard 120-volt socket, divide 300 by 120. The transformer will draw 2.5 amps of current.2017-04-24