446-K-H-N-300A Circuit Protection

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Circuit breakers protect electrical systems against overloads, short-circuits, and surges that might cause power failure, and, in the case of short-circuits and surges, particularly in hazardous areas, extreme danger to workers, equipment, and the environment.

The 446-K-H-N-300A, a type of circuit breaker, is a specialized automotive circuit breaker typically used to protect a vehicle wiring harness from over-current conditions resulting from a short circuit. This circuit breaker is designed with a thermal-mechanical trip mechanism which combines the operating characteristics of both thermal and mechanical elements. It is reset by lifting the toggle and pushing it back until it locks.

The 446-K-H-N-300A circuit breaker finds application in various industrial, automotive and marine sectors. In the automotive sector, it is often used to protect the vehicle\'s wiring harness from over-current conditions resulting from short-circuited cables or loose wires, as well as to provide a shutoff mechanism in the event of an overload.

Working principle of 446-K-H-N-300A circuit breaker involves two independent functions, namely thermal function and mechanical function. Thermal element detects the amount of current flowing through the circuit. It is designed to provide quickly detect any increase in current which may lead to an overload. As the current exceeds the trip point, the bi-metal strip bends and trips the breaker. On the other hand, the mechanical function senses a sustained overload and opens the breaker in the event of a sustained overload.

The 446-K-H-N-300A circuit breaker consists of a contact assembly, an actuating lever, a trip lever, and a trip bar. The contact assembly is comprised of two terminals and is arranged in such a way that when the breaker is switched off, the terminals are in an open position, thus preventing any current flow. The actuating lever is used to close the circuit breaker and the trip lever and trip bar are used to trip it open in the event of an overload. The trip lever and trip bar operate by providing a mechanical force to the contact assembly which forces it to open.

The overall design of the 446-K-H-N-300A circuit breaker provides a reliable manner to protect against short circuit and overload conditions, which may lead to the destruction or degradation of electrical equipment. It is also considered to be well adapted to protection of current-limited loads where there is a need for high speed tripping. The 446-K-H-N-300A has been designed and tested in accordance with applicable international standards including IEC, ANSI, UL, CSA, VDE and other governing agencies.

In conclusion, the 446-K-H-N-300A circuit breaker is a specialized automotive circuit breaker which utilizes a thermal-mechanical trip mechanism. This circuit breaker finds application in wide range of industrial, automotive and marine sectors for protection against short circuit and overload conditions. It is designed in accordance with the standards and provides a reliable manner of protection for current limited loads with fast tripping capabilities.

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