 # Quick Answer: How Many Amps Does A 10kva Transformer Pull?

## What size breaker do I need for a 75 kVA transformer?

Senior Member.

I know the typical industry installation is to size the primary OCPD of a 75 KVA transformer at 125 amps and the Secondary at 300 amps..

## What size transformer do I need for a 200 amp service?

If you are a residential customer and have installed a 200 A panel that is 240/120 V single phase, the utility may decide to install a transformer that is much smaller. For example, the apparent power for a 200 A at 240/120 V single-phase service is 48 kVA. The utility will not typically install a 50 kVA transformer.

## What is kVA formula?

Use the formula: P(KVA) = (V^2/R)/1000 where R is resistance in ohms. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA. Calculate power rating in KVA when you know power in watts and the power factor.

## How do I choose a transformer size?

Transformer size is determined by the kVA of the load. Load voltage, or secondary voltage, is the voltage needed to operate the load. Line voltage, or primary voltage, is the voltage from the source. Single-Phase has two lines of AC power.

## How many amps can a 5kva transformer handle?

Since transformer are sized based on KVA we need to convert this number to amps in order to know what the transformer is capable of handling. So, for a 100 KVA transformer we will multiply 100 x 1000 and then divide it by 240v. That gives us 416.67 amps.

## How do I convert KVA to amps?

Calculation with line to line voltageS(kVA) = √3 × I(A) × VL-L(V) / 1000.So kilovolt-amps are equal to √3 times amps times volts divided by 1000.kilovolt-amps = √3 × amps × volts / 1000.kVA = √3 × A ⋅ V / 1000.S = √3 × 12A × 190V / 1000 = 3.949kVA.

## How many amps can a 300 kVA transformer handle?

Three Phase TransformerKVA208V2400V22562554.230083472.3400111296.3500139012017 more rows

## How many amps is a 15 kVA transformer good for?

Three Phase Transformers, Full Load Amperes (FLC)KVA208V480V1541.718.03083.436.14512454.211 more rows

## How many amps is 70 kVA?

GENERATOR AMP RATINGS – THREE PHASE EXTENDEDkVAkW1206955331.27560361.38065391.48870421.521 more rows

## How do you size a breaker for a transformer?

For Primary Side:Transformer Primary Current (Ip) =52.49Amp and impedance is 5%As per above table in not supervised condition Size of Circuit Breaker= 600% of Primary Current.Size of Circuit Breaker = 52.49 x 600% =315Amp.More items…•

## How many amps is 1kVA?

1,000 voltOne KVA equals 1,000 volt-amps, and is calculated by multiplying voltage and amps.

## How many amps is a 1000 kVA transformer?

kVA to Amps Conversion ChartkVAkW208 V875 kVA700 kW2,429 A1,000 kVA800 kW2,776 A1,125 kVA900 kW3,123 A1,250 kVA1,000 kW3,470 A28 more rows

## What size breaker do I need for a 45 kVA transformer?

A three-phase, 480-volt, delta-connected 45kVA transformer protected by a 70-ampere circuit breaker supplies two feeders not more than 25 feet in length.

## How many watts is 1kVA?

This means that the formula for watts = volts x amps x power factor. For example, 1kVA UPS from N1C has the capacity to power 900 watts of connected equipment. This means the UPS has a “power factor” of 0.9.

## How do I convert kVA to kW?

The formula for converting kW into kVA is: Actual power (kW) / power factor (pf) = apparent power (kVA)