# What size breaker do I need for a 150 kVA transformer?

## What size breaker do I need for a 150 kVA transformer?

150 KVA @ 120/208 3Ø = 416 amps. This would obviously overload a 400 amp panel. If the 400 amp panel is loaded to the full 400 amps, you’ll see roughly 172 amps at the 200 amp breaker.

## How many amps can a 150 kVA transformer handle?

Three Phase Transformers, Full Load Amperes (FLC)
KVA 208V 480V
75 208 90
112.5 312 135
150 416 180

What are the dimensions of a 150 kVA transformer?

Specifications

Height 43.75 in (1111.25 mm)
Width 32 in (812.80 mm)
Depth 27 in (685.80 mm)
Product Weight 800.00 lb(US) (362.874 kg)

### How do you determine the wire size on a transformer?

For Transformer, we should choose two types of cable such as the primary side and secondary side. The rating of the cable should be 150% of the full load current. i.e if your transformer’s primary current is 450 Amps means, you should choose 450 *150% = 675 Amps capacity size cable.

### What size wire do I need to feed a 45 kVA transformer?

For a 45kVA transformer, 54A×1.25=68A, so use a 4 AWG conductor rated 85A at 75°C, per Table 310.16.

How many amps does a 25 kVA transformer put out?

Three Phase Transformer

KVA 208V 480V
20 56.6 24.1
25 69.5 30.1
30 83.4 36.1
37.5 104 45.2

## How many amps is a 5kva transformer good for?

22.73 Amps
kVA To Amps Calculator (With Table)

kVA (Apparent Power) Voltage (220 V) Amperage (A)
How many amps is 1 kVA? 220 V 4.55 Amps
How many amps is 5 kVA? 220 V 22.73 Amps
How many amps is 10 kVA? 220 V 45.45 Amps
How many amps is 20 kVA? 220 V 90.91 Amps

## How big is a 300kva transformer?

Specifications

Height 49.50 in (1257.30 mm)
Width 41 in (1041.40 mm)
Depth 32 in (812.80 mm)
Product Weight 1359.00 lb(US) (616.432 kg)

What is the weight of a 75 KVA transformer?

410.00 lb
Specifications

Height 37 in (939.80 mm)
Width 30 in (762.00 mm)
Depth 20 in (508.00 mm)
Product Weight 410.00 lb(US) (185.973 kg)

### What are the standard sizes of transformers?

Especially for commercial buildings, the most common sizes for transformers are the following:

• 3 kVA.
• 6 kVA.
• 9 kVA.
• 15 kVA.
• 30 kVA.
• 37.5 kVA.
• 45 kVA.
• 75 kVA.

### What is the weight of a 75 kVA transformer?

What’s the maximum voltage for a 150 kVA transformer?

Therefore, having a 400 amp, 120/208 volt, 3-phase panel as you propose would be permitted. Also per NEC Table 450.3 (B), the maximum rating of the primary OCPD for the 150 kVA transformer would be 250 amps ( (150 kVA x 1000) / (480 volts x 1.732), rounded up to the next standard OCPD size).

## How many volts are in a 3 phase AMP?

3-Phase Amps = KVA / Volts / 1.732 x 1000

## How big of a transformer do I need for 120 volt?

This equates to 461.5 amps at 120/208 volt, 3-phase. If you want to convert the entire 200 amp 277/480 volt, 3-phase service to 120/208 volt, 3-phase, you would need a minimum of a 225 kVA transformer. However, a 150 kVA transformer will likely suffice if the HVAC equipment is 480 volt.

How to calculate the KVA of a transformer?

1-Phase KVA = Volts x Amps / 1000 1-Phase Amps = KVA / Volts x 1000 3-Phase KVA = Volts x Amps x 1.732 / 1000 3-Phase Amps = KVA / Volts / 1.732 x 1000