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Answer :
The circuit you are referring to is typically called an MCR (Master Control Relay) circuit. In engineering, particularly in electrical and control systems, this type of relay circuit is often used to ensure safety and control.
What is an MCR?
MCR stands for Master Control Relay. It is a hard-wired relay used in industrial control circuits to control the on/off state of other relays or outputs. The MCR helps to ensure that a machine or process can be quickly stopped in case of an emergency by cutting the power to the control outputs.
How Does It Work?
Pushbutton Operation: The MCR circuit typically includes two pushbuttons—a start button and a stop button. These buttons are used to control the relay state.
Seal-In Feature: When the start button is pressed, the MCR coil is energized, which closes the contacts and allows current to flow to the outputs, turning them on. The circuit is 'sealed' in this state because the relay maintains its position even when the start button is released.
Safety and Shutdown: When the stop button is pressed, it de-energizes the MCR coil, which opens the relay contacts. This action immediately cuts the power to the outputs, stopping the machine or process.
Why Use an MCR?
- Safety: It allows for quick and total shutdown in emergencies.
- Control: Provides an organized method to control when systems are powered on and off.
- Reliability: Ensures a constant state unless the operation specifically requires change, reducing chances of accidental power loss.
Where is it Used?
MCR circuits are used extensively in industrial environments, such as manufacturing plants, to control machinery safely and efficiently.
Conclusion
The MCR circuit plays a crucial role in ensuring safety and reliability in industrial control systems. It allows operators to control power to critical components easily, ensuring systems can be shut down safely whenever needed.
For this question, the correct multiple-choice option is A. MCR.
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Rewritten by : Jeany
