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Circuit diagram is shown Here input of FAN is connected to current sensor through a regulator My question is..

  • Is it ok to measure AC current through this sensing IC(ACS712) When fan speed changes ?

enter image description here

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  • \$\begingroup\$ There are a few things wrong with your schematic here. Measuring current with an ACS712 or ACS714 (there is no ACS741) is fine, that's what they're made for, but hooking it up directly to 230V mains is not. You also have no indication of what current you expect the fan to be drawing; if it's too little, it may be hard to measure. It's unlikely to be too much. \$\endgroup\$ – Hearth Feb 11 at 17:52
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Welcome to electronics.stackexchange
Your picture shows ACS712, so I will stick to it as ACS741 is of non-existence (or, did you mean ACS714?)
ACS712 allows of measuring current from +/- 5A (part x05B) to +/-30A (part x30A).
Datasheet says:

ACS712 provides economical and precise solutions for AC or DC current sensing

So, yes, you can use it to measure AC current when fan speed changes, providing your fan doesn't draw more than 5A (for part x05B).

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