450MMT

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450MMT fuses are electrical devices employed to protect an electric circuit from overload or short circuit. They are specially designed for high-current industrial applications and are an effective solution to protect the motors and other industrial equipment from damages due to excessive currents. These fuses are applicable for low and medium-voltage applications in a variety of industrial, mining and utility operations.

Uses and Applications

450MMT fuses are suitable for low and medium-voltage electrical applications in industrial, mining, and utility operations. They provide reliable overcurrent protection and are suitable for medium and high-current applications such as arc furnaces, welding machines, and similar high-electric demands, as well as for motors in large-scale operations. They are also suitable for short-circuit protection of GIS and URD systems, generators, and motors.

450MMT fuse links are employed in various high-current applications such as shoe and bow-type motors, electric distribution systems, electric car drives, battery chargers, electrical and lighting systems, controllers, welding equipment, and other heavy-duty industrial equipment.

Technical Specifications

450MMT fuses are rated for 700A-2400A short-circuit currents. They are produced in 16kV-38kV voltage range and are offered in various sizes such as 7.5"x10.5" or 7.5"x14", depending on the application. The fuse links are available in both single and triple fusing designs. They are also equipped with optional earth leakage protection for additional safety.

The 450MMT fuses consist of a body made of heat-resistant Zinc Oxide and a tubular element. The element is a copper core with an internal resistance allowing the correct operation of the fuse. It is also equipped with anodes and cathodes for high-disruptive and thermal stability. The maximum operating temperature is +200°C. These fuses have a rated MTT (Minimum Trip Time) of 2.5 sec and are certified according to UL, IEC and CSA standards.

Working Principle

450MMT fuses are designed to protect the connected equipment from overcurrent and short-circuit damages. Fuses are connected in series with a current-carrying circuit and allow the current to flow when the connected load is normal. When the connected load draws too much current, the fuse element heats up due to the increase in electricity, increasing the resistance until it is high enough to stop the current flow. The fuse element quickly cools when the current flow is interrupted, resetting the fuse to its original condition.

In order to ensure the proper operation of a 450MMT fuse, it is important to select the appropriate size of the fuse for the circuit. In case of overcurrent, the fuse must trip faster than the equipment connected to it in order to protect it from damages. It’s also important to select fuses with MTT ratings below the rating of the connected load in order to ensure that the fuse will not take too much time to react to excessive current.

Conclusion

450MMT fuses are specially designed to protect the motors, electrical equipment, and other high-current industrial systems from damages caused by overcurrent and short-circuit conditions. They offer reliable protection and are easy to install in the relevant system. These fuses are available in various sizes and ratings to suit different applications and requirements. They also provide optimum protection when the correct size and rating is selected according to the connected load.

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