A magnetic motor starter is a magnetically activated switching device used for controlling the power to a load in AC or DC systems without overload protection. Overload protection would be provided by separate devices like circuit breakers or fuses.
The device described in the question is a magnetic motor starter. A magnetic motor starter is a magnetically activated switching device used for turning on and off the electric power to a load, such as a motor, without providing overload protection.
This type of starter is commonly used in both single-phase or three-phase AC power systems, as well as in DC power setups. The question specifically points out that there is no overload protection attached to this switching device.
Overload protection would typically be provided by devices such as circuit breakers or fuses, which are designed to break the circuit and prevent damage due to thermal overload.
It's important to note that modern electrical systems incorporate several safety features, like the three-wire system with neutral, live, and ground wires, and protective cases around appliances to prevent electric shocks. These are separate from the magnetic motor starter, which serves a different function in an electrical circuit.
--The given question is incomplete, the complete question is
"a----- ? is a magnetically activated switching device (without overload protection attached) and is used to switch single-phase or three-phase ac power, or dc power to the load."--