LEG66-39991-20-V Circuit Protection

Circuit breakers are essential components of any electrical system that enable electricity to be supplied safely and efficiently. The LEG66-39991-20-V is a type of circuit breaker, designed to protect electronic and electrical equipment from overloads and short circuits. The following sections will discuss the application field and working principle of the LEG66-39991-20-V.

Application Field
The LEG66-39991-20-V is a circuit breaker designed for use in industrial, commercial, and institutional installations. It is suitable for use in 120 and 240-volt single-phase and three-phase systems. It can be used in lighting and appliance branch circuits, agriculture and irrigation circuits, and many other applications. The LEG66-39991-20-V is UL-classified, and meets the requirements of the National Electric Code (NEC).

Working Principle
The LEG66-39991-20-V is an air-break circuit breaker, which means that air is used as the interruption medium. This type of circuit breaker consists of an arc-chute, a stationary arc shield, and a bimetallic coil. When a circuit is overloaded or short-circuited, the arcing current causes the bimetallic coil to expand, which in turn trips the breaker. The arc-chute acts as an enclosure which contains the arcing current and guides it towards the arc shield. The arc shield absorbs the energy of the current and extinguishes the arc, thus breaking the circuit.

The LEG66-39991-20-V also features a thermal-magnetic trip unit. This unit is designed to detect overloads and short circuits, and to trip the breaker accordingly. The thermal trip operates on the principle of heating caused by the current flow, and trips the breaker when the maximum current is reached. The magnetic trip operates on the principle of flux generated by the current flow, and trips the breaker when the maximum current is exceeded. Together, these two features provide reliable protection against overloads and short circuits.

The LEG66-39991-20-V is a high-performance circuit breaker that offers protection against overloads and short circuits. Its air-break design and thermal-magnetic trip unit provide reliable protection for electrical systems, making it an ideal choice for industrial, commercial, and institutional applications.