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Power strip is a device which enables user to connect more than one appliance flexibly at a single time and in a single socket only. A power power strip is a block of electrical sockets attached to the end of a flexible cable that plugs into an electrical receptacle.
At Bestofelectricals.com you can find various types of power strip; 3+1, 4+1, 4+4, 6+1, 8+1. (The first digit stands for the number of sockets and the second one stand for the number of switches) in a power strip. For example, if it is a 4+1 power strip, it means this power strip consists of 4 sockets and 1 switch to turn on and off all the sockets at once. Some powerstrips includes circuit breaker to disrupt current in case of overload or short circuit.