8HLE-250E

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What is 8HLE-250E Fuse?

8HLE-250E is an ultra-fast type current limiting fuse designed for use in medium voltage (MV) and high voltage (HV) power networks with high current rating. This type of fuse is a miniature size, UL recognized, and CSA certified with a current limitation of 1000A. It is widely used in medium voltage power distribution networks and high voltage power supplies.

Application Field of 8HLE-250E Fuse

The 8HLE-250E fuse is used in various applications such as overcurrent protection of DC circuits and AC circuits, main circuits, residual current-operated circulation systems, current limitation systems, and overload protection systems. It is also used in motor drives, photoelectric switches, and high voltage motor starters. This type of fuse is also suitable for use in battery and electroplating circuits.

The 8HLE-250E fuse has a large breaking capacity of 20,000 amperes and a short-circuit current rating of up to 500 amperes. This makes it applicable for high current applications in various main and secondary circuits where the short-circuit protection is required.

Working Principle of 8HLE-250E Fuse

In order to protect the main and secondary circuits from a short-circuit or overload fault, the 8HLE-250E fuse relies on the principle of thermal-time current coordination. This fuse is designed to coordinate with overload relays so that the relays will open the circuit before the fuse opens in order to prevent damage from a short-circuit or overload.

When the current rating passes the designed melting rating of the fuse, the fuse element gets heated up due to the current flow and melts, breaking the connection thus de-energizing the circuit. This is known as the melting action. In case of a short-circuit, the current rises significantly causing the fuse element to melt instantly and break the connection, thus overload protection is achieved.

The 8HLE-250E fuse also features a voltage limitation to protect the secondary circuits, making it ideal for use in high voltage applications. The fuse is also designed to withstand temperature variations of up to 400°C, making it suitable for use in high temperature applications.

Conclusion

The 8HLE-250E Fuse has been designed to provide reliable overcurrent and short-circuit protection for medium voltage and high voltage circuits and offers a wide range of applications. It uses the principle of thermal-time current coordination to achieve protection from short-circuits and overloads and features a voltage limitation to protect the secondary circuits. This type of fuse is suitable for use in high temperature and heavy-duty applications, making it an ideal choice for many power distribution networks.

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