5TT 300-R

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Fuses are integral components of electrical power systems, primarily used for protection against potential overloads and line faults. The 5TT 300-R is one of the most commonly found fuses, with a broad application field and its own unique working principle.

The 5TT 300-R fuse is designed for high current applications, and typically used for overload and short circuit protection in medium voltage AC or DC circuits. It is used in areas such as industrial, commercial, residential, utility and instrumentation. The fuse is ideal for protecting power transformers, circuit breakers and medium voltage power distribution systems. Due to its max voltage of 3.6 kV, it can also be employed in DC applications such as wiring for photovoltaic systems.

The 5TT 300-R is a slow-blow thermal fuse, meaning it contains a bimetallic strip composed of two dissimilar metals that are connected together. The bimetallic strip is connected to a spring, and the ends of the spring are then connected to contacts. When current passes through the circuit, the heat generated by the current causes the bimetallic strip to bend. This bending creates a tension on the spring, causing it to compress. As the current passing through the fuse increases, the temperature of the bimetallic strip rises, causing it to bend even further. When the current reaches a certain level, the tension on the spring becomes so great that it causes a physical interruption of the circuit. This interruption effectively trips the circuit, limiting the amount of current flowing through it and preventing damage from an overload or short circuit.

The 5TT 300-R fuse is designed to meet the safety requirements of relevant industry standards such as IEC 60269, allowing it to be used in a range of applications. The maximum rated voltage and current of the fuse are 3.6kV and 300A respectively. The bimetallic strip is designed to trip the circuit within a range of 3-10 seconds after the current passes the rated value, ensuring a safe level of protection.

In conclusion, the 5TT 300-R fuse is a slow-blow thermal fuse designed for high current applications. It is used for protection in medium voltage AC or DC circuits, and has a rated voltage and current of 3.6kV and 300A respectively. Its bimetallic strip is calibrated to trip the circuit within 3-10 seconds of the current exceeding the rated value, thus ensuring a safe operating level.

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