IULHK21-38938-100

Circuit Breakers

Circuit Breakers are devices that are used to protect electrical circuits from overcurrent and short-circuit faults. They are extensively used in electrical systems for preventing damage to circuits and components. One of the most common types of circuit breakers is the IULHK21-38938-100. This article will discuss the application field and working principle of this particular type of circuit breaker.

Application Field

The IULHK21-38938-100 is a type of three-pole circuit breaker, with a rated current of 100A. It is suitable for low-voltage systems with an operating voltage between 50 and 500 volts DC or 20 and 690 volts AC. As such, it is suitable for application in residential, office, and commercial establishments, for providing protection against overcurrent and short-circuits in electrical circuits.

Working Principle

When an overcurrent or short circuit occurs in an electrical circuit, the IULHK21-38938-100 detects the overload or short-circuit and trips the circuit breaker to disconnect the circuit. This is done by means of a bimetallic strip, which heats up when the current exceeds the rated value and then causes the circuit breaker to trip. When this happens, the electrical circuit is automatically disconnected and the overcurrent or short-circuit is prevented.

Additionally, the IULHK21-38938-100 has a built-in protection against undervoltage as well. This feature helps to prevent the circuit from operating at a voltage that is too low. The voltage-sensing bimetallic strip senses the undervoltage and switches the breaker off when the voltage level drops below a set point.

Once the breaker is tripped, it must be reset manually before the circuit can be restored. This also serves as an additional layer of protection, since the circuit Breaker cannot be reset until the cause of the overload or short-circuit is identified and corrected.

Conclusion

The IULHK21-38938-100 is a type of three-pole circuit breaker that is suitable for low-voltage systems. It has the ability to detect both overcurrent and short-circuit fault conditions as well as undervoltage conditions, and will trip the circuit breaker when any of these conditions occur. Additionally, the circuit breaker must be manually reset before the circuit can be restored, ensuring an additional level of safety.