UV Release

There's no such thing as 'instantaneous'. All electromechanical systems require time to operate.

If for a second we ignore Mr. Slack's comments about the nature of electro-mechanical devices (which, by the way, he is correct about)...

You are asking the user group if it is possible for you to do something that depends upon how capable you are at designing things when we have zero knowledge about how smart you are, what your field of study is and what technical experiences you have enjoyed.

I will hazard a guess and say... only one answer is possible here, "No... we can not answer your question".

Assuming you are unfamiliar with standard practices in the Electrical Engineering field, there are dozens and dozens of ways to accomplish this task. The most common is to use a UV trip coil on your circuit breaker. These are standard devices made for almost every brand of circuit breaker that work in conjunction with the breaker's existing Instantaneous Trip mechanism.

First you must be clear about what you are designing . you must know and set your permissible time factor for the the tripping time. When you say Relay ,it means electromagnetic switch . Electro magnetic switch always has its inherent time delay in operation even though it is termed instantaneous UV relay.Better think of Electronic switching. Use SCR,Thyristor ,Diac, Triac anything for switching . You better design a workable circuit for High current ,low and Medium Voltage switching and make it.IT is possible. Please let us also know about your future plans and progress.Best of luck.

Dear Friend

Your requirement is not a difficult one. We are an Indian manufacturer of battery chargers for power plants, substations etc. & we have installations in India and south east asia. Apart from DC undervoltage relay & DC overvoltage relay, we regularly use AC undervoltage and AC over voltage relays in the battery charger panels manufactured by us ( whenever a customer wants same ). and thus have business interest in this. If required, send me a separate mail so that I can give you an offer.

Furthermore, please introduce yourself.

Thanks

Ashok Toshniwal, Bangalore, India

Yes. There is a way of achieving this.

After you are done with this design, I suggest you go ahead and design the wheel.

Wangito.

This can be done with a comparator circuit using a voltage comparator operational amplifier like LM 311. Apply a reference voltage to one input and a rectified sample of 400VAC to the other input. Choose the input pins in such a manner that when there is a dip in the 400 VAC, a voltage will appear at the output of the comparator which through an interface can be connected to the coil of a contactor to trip the supply.

The response of the circuit will be nearly two or three cycles of the mains voltage.

why do u want to reinvent the wheel.many devices are available in the market.However U must define what do mean by Instantaneous .