355PJ31-7

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The 355PJ31-7 is a specialized type of fuse manufactured by Consolidated Edison, designed to perform a particular duty in a vast range of electrical applications. In this article, we\'ll discuss the application field and working principle of the 355PJ31-7.

The 355PJ31-7 is a time lag fuse rated for interrupting currents up to 125A when applied in a fully rated circuit, and suitable for the protection of motors, transformers, welding equipment and other inductive loads. It is also suitable for protecting against circuit overload and short-circuit faults, effectively preventing damage to equipment and personnel and ensuring the safety of the circuit.

The 355PJ31-7 features a special construction that combines a time-current characteristic with a voltage-decline characteristic, connected in series through the terminal. This includes a high current-sensing device and a short-time delay element. When the current flowing through the over current device reaches a certain threshold, it triggers the time-delay element, resulting in a voltage drop in the circuit and the subsequent interruption of the current.

The 355PJ31-7 is designed to ensure reliable and safe operation in a wide range of electrical applications. It offers superior protection in applications where multiple power sources are utilized; it can be used with both AC and DC circuits. In addition, it reduces arc flash risk and improves safety by rapidly interrupting the circuit before arcing can occur. Furthermore, it has an extended time-current window (as shown in the figure below), allowing the fuse to perform better under a variety of conditions, including momentary overloads and short circuits.

Additionally, the 355PJ31-7 can be used in applications with significant levels of inrush current, limiting its effect on the main circuit and protecting against other faults. This fuse is also designed for outdoor use, providing resistance to a variety of environmental conditions.

The figure below demonstrates the typical time-current characteristic of the 355PJ31-7, which can be used to select a proper fuse size and rating for a given application. As can be seen, the fuse has a lower melting current than a normal fast-acting fuse, and a high interrupting capacity. This characteristic is designed to ensure that the fuse will open at a lower current threshold than a normal fuse, further increasing its efficacy in protecting the circuit.

In conclusion, the 355PJ31-7 is a specialized time lag fuse designed for a wide variety of electrical applications. It is rated for interrupting currents up to 125A in a fully rated circuit, and offers superior protection against overloads, short circuits and other faults in the circuit. It is designed to provide reliable and safe operation, and has an extended time-current window, making it well suited for a variety of applications.

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