0665.400HXLL

Fuses are an important safety component for many electrical equipment, and they can be used to prevent surges, distant faults, overloads, shorts, and other hazardous conditions that might otherwise damage or destroy a whole electrical system. The 0665.400HXLL is a specific type of fuse manufactured by Cooper Bussmann with a 500VAC rating and 30A current rating. This article will discuss the application field and working principle of the 0665.400HXLL fuse.

Application Field

The 0665.400HXLL fuse is designed for use with medium and high voltage electrical panels and systems. This type of fuse can be used as an AC branch circuit current interrupt device for the primary distribution of power in medium and high voltage applications, such as transformers, capacitor banks, switchgear, transfer switching, unmanned substations, and wind turbines. It is also suitable for branch protection applications and protection against both short-time and long-time thermal overloads.

This type of fuse is approved for use in UL, IEC, CSA, and VDE listed equipment. It is available in two versions: a dual element fuse with a power interruption capability and a single element fuse without power interruption.

Working Principle

The 0665.400HXLL fuse is a fast-acting fuse with dual-element construction. It contains two internal elements: a time-lag element and a current-limiting element. The time-lag element consists of a metal wire or strip that takes several seconds to heat up and activate. This element protects against surges, overloads, and sparks. The current-limiting element consists of a thin metal ribbon that melts instantaneously when the current reaches the rated value.

When an overcurrent passes through the fuse, the current-limiting element heats up and melts before the time-lag element can activate. This causes a rapid reduction in current, thus protecting the circuit. When the current-limiting element melts, the time-lag element will then heat up and activate, thus providing further protection against short circuits and other overloads.

When the 0665.400HXLL fuse is installed as an AC branch circuit current interrupt device in a medium or high voltage system, it acts as an additional breaker in the circuit. If the current in the circuit exceeds the rated value, the current-limiting element will melt, thereby interrupting the current and protecting the system.

The 0665.400HXLL is designed to provide reliable protection against electrical damage and the risk of fire due to overcurrents and short circuits. Its superior performance in both normal and abnormal conditions makes it an ideal choice for medium and high voltage electrical panels and systems.