50mH, high current inductors?

[fubar.gr]

I am looking for 25, 40 and 50mH inductors, able to handle high currents (3 to 10 amps). The operating frequency is 50Hz.

What kind of core do I need?

[German_EE]

These are going to be BIG inductors

[HighVoltage]

Are you talking about DC current ramping up to 3-10A and repeating the pulse with 50Hz or AC current constantly at 50Hz?
What is the application?

[SeanB]

If DC there will have to be a big air gap in there, and if the range of current variation is well defined you might even want to have a ferrite bias magnet in the core as well to keep it in a linear part of the BH curve. That allows use of a much smaller core at the expense of some linearity. If it is a simple LC filter for a power supply however that will not be much of a worry.

[amyk]

Big and not cheap:
http://www.digikey.com/product-detail/en/195R10/195R10-ND/455491

Apparently that one weighs 26kg

[SeanB]

26lb, about 12 kilos. Though if you look up there is one of 2.5mH at 100A, which is 40kg. About the mass of a bag of cement, and it definitely is going to cost a lot more than that.

[HighVoltage]

You would need about 1500 turns, if you use silicon transformer steel
And you need heavy gauge copper wire to keep the resistance after 1500 turns in the 100 mOhm range.

Yes, this will probably be very big and heavy, even if you build it yourself.

[Zero999]

Perhaps you could rewind an old microwave oven transformer to save money.