Electric Motor Fuses

In electric motors and other equipment, fuses are used with the purpose of limiting the current of a circuit, providing the interruption when we have a short circuit or overload. Short circuit is an intentional or accidental connection between two points of a system, electrical equipment or a component. Under these conditions the current assumes a value many times higher than the operating current, thus causing the equipment and part of the plant to undergo excessive thermal or electrodynamic stress.

Its performance is due to the casting of an element by the Joule effect, caused by the elevation of current in a given circuit. The fuse has properties where its melting point is less than the melting point of copper, which is the material most commonly used in general purpose conductors.

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They are composed of a conductor of reduced section, mounted on a base of insulating material and when overload occurs the fusible link fuses, ceasing the passage of electric current, avoiding damages to the installation and equipment.

In motor fuses, the rated current is the current value that the fuse must withstand and the breaking current is the maximum value it will break.

Foundation for Motor Installation

For the installation of electric motors, the foundation design should ensure that we have safe operating conditions with maximum accessibility.

It is very important to leave free space around the machine to ensure free access for maintenance and monitoring.

The cooling air must enter and exit the machine without problems and we must take care to ensure that other equipment that is nearby does not heat the cooling air of the machine or its parts.

The foundation must be solid, rigid, flat and free of external vibrations and all vibration and resonance of the machine in relation to the foundation must be checked, thus avoiding excessive vibrations.

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For the installation of the machines, a concrete foundation is preferable, but a correctly designed steel construction is also accepted. The fixing of the electric motor, the supply of air, water, oil and cable channels, as well as the foundation holes must be observed prior to construction.

The foundation should be designed so that 2 mm shims are placed under the machine feet to ensure fit and facilitate a possible replacement machine installation.