It should be remembered that in general, the protection elements have the function of managing the shutdown mechanisms in case of a predetermined condition. When it comes to short-circuit rotor induction electric motors, the most commonly used one is the three-phase induction motors with squirrel-cage-type rotors, as they are the most common in the industry. This designation is given by the type of rotor used, a short-circuit rotor https://www.mrosupply.com/plumbing/rotary-swivel-and-expansion-joints/rotary-joints-and-unions/1371712_bc-54065-24-51_deublin/ . Considering that as every motor can suffer significant variations from the electrical point of view, there is therefore a great need to protect it adequately. Therefore, the necessary main protections act against short circuit, overload, low voltage, open phase, phase reversal and internal defects, among other phenomena.
Explosion-proof motors are basically designed to operate in environments saturated with gases and dust, susceptible to the danger of rapid ignition, which may prevent the emergence of the same, which may arise through some spark or even high heating. Its enclosure is capable of resisting explosions of explosive gases or explosive mixtures specified therein, and prevents a surrounding flammable atmosphere from being ignited.