Dear all,

I am looking For Dc motor Driver circuit which can handle 24v 16A-20A. with back emf and over voltage protections. Can someone here help me out building it

We can use DPDT relay/spdt relay or Motor Driver ICs Must have protection and compatible with Arduino boards.

it must have feature like
dir change
Pwm
on/off the signal

 

The feature you requested; "direction change" means you should google for a "h-bridge DC motor driver".

That will be slightly more expensive than the common "DC motor PWM driver". You could always buy one of those and add a direction changing relay.