# How much does a 300 VA trafo weigh

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#### goldyrathore

Hi,

I would like to understand the weight difference of EI trafo against a toroid trafo.
How much would a 300VA trafo typically weigh in both the forms?

Thanks,
Goldy

#### donpetru

Weight transformer don't tell us nothing about the power transformer (just give us some clues, but elusive). Leakage magnetic field of a toroidal transformer is much smaller than that generated by a transformer core E + I. Toroidal transformers are made in three standard heights: high, standard and low profile.

For example (weights according to standard SR EN 61558):
1.Toroidal transformers 300VA:
- high profile - 2.97Kg (6.54 lb. lbs);
- low profile - 2.85Kg (6.28 lb. lbs);
- standard profile - 2.92Kg (6.43 lb. lbs);
2. Electrical transformers with core E + I - 300VA = 4Kg (8.81 lb. lbs).

Regards

Last edited:

#### TechGuy

Hi,

I would like to understand the weight difference of EI trafo against a toroid trafo.
How much would a 300VA trafo typically weigh in both the forms?

Thanks,
Goldy

Switching frequency is an important factor in the amount of power a transformer can handle. A very high frequency AC input needs a small core to pass a lot of power. At lower switching frequencies a bigger, heavier core is required. This is why a 500 Watt linear power supply operating at 60\50 hz is heavy but a 500 Watt Switch mode power supply is fairly light weight.

That said, different core materials are required to operate at different frequencies. At low frequencies steel plates (usually silicon steel) can be used. However, at high frequencies eddy currents rise causing excessive power loss, turning the transformer into an induction heater. Typically, at higher frequencies, ferrite is the core material used because eddy currents remain low.

#### donpetru

Returning with a supplement: weights transformers exhibited by me above are for 50 Hz single phase electrical transformers.
@goldyrathore, I think this type of transformer you meant!

#### PMA

Paid Member
My 300VA toroidal transformers in this:

An externally hosted image should be here but it was not working when we last tested it.

have 3.0 kg each.

Regards,

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