Safety Switches
Description
Safety switches are safety devices used to disable or shut down an electric unit to protect people from electric shocks and avoid unexpected injury or death. Electric shock can occur on electrical devices household electrical appliances, electrical tools and electrical wiring. During an electric shock, the residual current passes through the person to earth. This flow of residual current through the heart can stop its functioning leading to sudden death. Safety switches easily detect electric shock by detecting the current loss from the circuit. The switches immediately shut off (within 10 to 50 milliseconds) the current leakage from the damaged switch, wiring or appliance. This stops the possibility of current flowing through the human body and flowing to the earth. Safety switches also known as residual current devices (RCD).
Types
Following are major types of safety switches:
Advantages
The advantages of safety switches are:
Disadvantages
The disadvantages of safety switches are:
Applications
The applications of safety switches are:
Used in bathrooms and workshops, swimming pools, garden sheds, homes, offices, industries, and in damp areas
Switchboard Mounted Safety Switches are used to provide complete protection to circuits from the board to the power point, light fittings and appliances
Power Point Safety Switches are installed directly to the existing power points; they are very useful in bathrooms and workshops
Portable Safety Switches are used when electrical appliances are operated outdoors
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