What is the relay overload of the thermal overload?
Thermal overload relay is a device for protection of electrical equipment intended for disconnecting the machine, equipment or installation from its power supply should damage or overload. This protection is achieved by inclusion of different types of heat -sensitive elements so that the power supply is to be formed under the conditions of overload. These thermal elements respond to a current that the protected component draws during its operation. If the component experiences an excessive increase in load, physical wear or damage, the amount of the drawn current will increase corresponding to the way. This causes thermal cutout and disconnect the main feed to the protected component. Increasing the flow of the flow causes proportional increase in the amount of generated heat. The current flow of the electrical device is the product of the load on which the device is subjected. Again, increasing the load will see the increase in current and generated heat. If this load increases to a point that exceeds the specification of the device design, it will overheat and eventually be destroyed.
Thermal overload relays are designed to prevent damage or destruction of electric machines by responding to an increase in the temperature of induced current. If the temperature rises above the relay evaluation, it activates and disconnects the primary power and prevents damage to the device. This deactivation is achieved either by mechanical or electrical blocking between the relays and the main power supply. The component sensitive to the temperature of the thermal overloaded relay can be a simple bi-metal belt or a more sophisticated electronic sensor or probe.
Bi-metal belt in relay overload of thermal overload consists of two different metals connected together. Different metal properties mean heat at different speeds, causing a strip bending. This bending movement then activates the cut -out device. The electronic relay of thermal overload uses a sensor or probe to read the current temperature. The microprocessor then dictates when the perimeter opens and snThe main power supply depends on the election parameters.
overload protection relays are installed in large machines or as a direct connection in the supply of smaller appliances. The control circuit relays consist of an element sensitive to heat and contact points. The control circuit for the protected machine passes through the relay contact points. If the machine reaches the overloaded current of the current, the heat sensor sensor switches the relay overload of the thermal overload, which in turn reduces the main supply to the machine. Smaller appliances generally have a power supply directly through the heat -sensitive element that bends under the conditions of overload and turns off the machine.