NITD25

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NITD25 fuses, also known as Non-Interruptible Type Delay (NITD) Fuses, are specialty fuses typically found in electrical and electronic applications. The fuse is designed to offer overcurrent protection without interrupting a circuit’s continuity, making NITD25 fuses ideal for applications requiring an uninterrupted, relatively low-resistance, current-limiting path.

The NITD25 fuse is commonly used in various applications with high-inrush currents due to inductive loads. These applications may include ballasts used in lighting systems, large electric motors, air conditioning units, heating systems, welding equipment and more. The fuse is also well-suited for controlling current-limiting devices associated with variable-frequency drives and adjustable power supplies.

NITD25 fuses contain a strip of nickel wire contained in a ceramic tube, with a metal end cap at each end. One end of the tube has a small diameter hole that allows a tiny trickle of current to flow through the wire without triggering the fuse. The other end contains a larger diameter hole produced by a non-explosive pyrotechnic detonator. In normal operating conditions, the voltage across the fuse remains low, preventing the pyrotechnic detonator from activating.

In the event of an overcurrent, the fuse reacts in two stages. First, the resistance of the nickel wire increases significantly, causing the voltage across the fuse to rise and the current to diminish. This begins the time delay process, during which current will remain above the fuse’s rating for a pre-determined amount of time. During this time, the voltage across the fuse rises until the threshold voltage specified in the fuse’s datasheet is reached, at which point the pyrotechnic detonator is activated.

When the detonator is activated, a small amount of energy is released that causes a rapid creation of gases inside the ceramic tube. This increases the thickness of the ceramic wall, raising the resistance of the fuse significantly and interrupting the flow of current through the wire, effectively blowing the fuse. The time delay feature of NITD25 fuses protect equipment that might otherwise be damaged by instantaneously cutting off its power supply.

NITD25 fuses offer several advantages over other types of specialty fuses, such as greater current ratings and a lower risk of nuisance tripping. The time delay feature of the fuse enables it to distinguish between normal and abnormal current ratings, thereby providing reliable and effective short-circuit protection without interrupting the continuity of the circuit.

In order to ensure safe and reliable operation, NITD25 fuses must be carefully matched to its accompanying application, power supply and load. The fuse should be properly rated for the current and voltage drawn by the circuit, and should also have enough resistance to meet the demands placed upon it. To further reduce the risk of blown fuses or nuisance tripping, periodic testing should be performed to ensure its performance has not degraded.

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