I want a hall effect sensor based current measuring module

Hi,

I want a hall effect sensor based DC current measuring module voltage is about 900V and current will be around 40A, application would be in electric vehicle.

Thanks.

You don't mention an output as in 4 - 20 mA, 0 - 10 V, or any of several other outputs. Personally I would go with a simple turn key off the shelf solution. Something like this or similar from any number of manufacturers. Choose an output which suits your needs.

Ron