LEGHF66-33703-21-V Circuit Protection

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A circuit breaker is an electrical safety device that helps protect electrical circuits from damage caused by excess current, usually resulting from an overload or short circuit. The LEGHF66-33703-21-V is a specific model of circuit breaker produced by Mitsubishi Electric. This particular model is a molded-case circuit breaker which is designed for use in industrial and commercial environments.

Application Field and Working Principle

The LEGHF66-33703-21-V is designed for both air navigation and automatic switching applications and is rated for up to 2,500 amps. It is approved for use in a wide variety of low-voltage applications. The circuit breaker features a mechanism to open or close the electrical contacts during an overload or short circuit.

The LEGHF66-33703-21-V has a unique design that optimizes its performance for both single- and double-pole applications. This unit uses a vacuum-pumped circuit breaker that is capable of making and breaking large amounts of current. The vacuum ensures that the contacts of the breaker remain closed until the current reaches a certain level. At that time, the vacuum piston will pull the contacts apart, breaking the circuit and protecting the equipment from an overload.

The LEGHF66-33703-21-V is designed with a thermal tripping mechanism that reacts to rapid currents. In the event of a rapid increase in current, the thermal elements expand, pushing a plunger that operates the contacts of the circuit breaker. This allows the breaker to quickly react to prevent damage to the circuit.

The LEGHF66-33703-21-V also contains a series of magnetic tripping elements. These elements are designed to react to surges in current. When the current increases beyond a certain level, the magnets will cause the plunger to break the contacts before the thermal tripping mechanism can. This extra layer of protection helps to ensure that the circuit breaker is able to respond quickly, even if the thermal mechanism fails.

The LEGHF66-33703-21-V also features an adjustable rating, allowing it to be set to the specific current requirements of the application. This rating can be adjusted to provide the highest level of protection for the circuit. Additionally, the LEGHF66-33703-21-V is UL listed and RoHS compliant, ensuring that it meets the highest safety standards.

The LEGHF66-33703-21-V is designed to provide reliable and efficient circuit protection in both air navigation and automatic switching applications. With its adjustable rating, thermal tripping system, and magnetic trip elements, this molded-case circuit breaker offers the highest level of protection for industrial and commercial applications. This makes it an ideal choice for any situation where reliable protection is required.

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