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Wednesday, August 7, 2019

Emergency Stop Switch and it works

what is Emergency Stop Switch and how it works?

Emergency Stop Switch provides both safety for the machinery and for the person using the machinery. The purpose of the emergency push button is to stop the machinery quickly when there is a risk of injury or the workflow requires stopping.

Emergency stop (E-Stop) buttons are an important safety component of many electrical circuits, especially those that control hazardous equipment such as gas pumps, moving machinery, saws, mills, and cutting tools, conveyor belts, and many other types of equipment. They are designed to allow an operator or bystander to stop the equipment in a hurry should anything go wrong.

An Emergency Stop Switch must be highly visible in color and shape, and must be easy to operate in emergency situations. The following requirements are specified in the European Standard EN 418 (International Standard: ISO13850).

1. A direct opening mechanism must be installed on the NC contact.
2. There must be a self-holding function.
3. The button must be a "mushroom" head design or something equally easy to use.
4. The button must be red and the background must be yellow.


Emergency stop buttons are wired in series with the control circuit on a piece of equipment. Pressing the E-Stop button breaks the circuit and removes power from the holding relay that keeps the circuit energized. The concept is the same for an energized single phase circuit, three phase circuit and for higher voltages. Larger pieces of equipment would operate off a larger relay.

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