Circuit Breakers

A circuit breaker is an automatically operated electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit. Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. This helps to mitigate potential hazardous conditions. Circuit breakers are made in varying sizes, from small devices that protect an individual household appliance up to large devices that protect very high voltage power networks.

IUGNF66-39709-498 is a specific type of circuit breaker. Its application field and working principle are outlined below.

Application Field

IUGNF66-39709-498 circuit breakers are designed for indoor AC 50Hz/60Hz, rated voltage up to 690V, rated current 63A and below circuit use. They are mainly used in lighting and distribution of power, protection of overload and short circuit for the motor.

Working Principle

The IUGNF66-39709-498 circuit breaker has an integrated trip unit that responds to changes in the electrical current in the circuit. When the current in the circuit exceeds the rated value, the reaction of the trip unit is triggered and the circuit is forcibly disconnected. Depending on the type and amount of overload or short circuit, an adjustable current limit is triggered. The current limit is adjusted according to the applicable standards, such as IEC60947-2.

When the fault is cleared, and the current returns to the rated value, the circuit breaker can be reset manually. The reset button can be used to reset the trip function. Once the breaker is reset, it is ready for a new fault. When the breaker is in the reset position, the contacts inside the breaker are closed, and current flows through the circuit as normal.

Conclusion

IUGNF66-39709-498 circuit breaker is a reliable and versatile component for protecting circuits from overload and short circuit. It is designed for indoor AC 50Hz/60Hz, rated voltage up to 690V and rated current 63A and below applications. Its integrated trip unit is triggered when the current in the circuit exceeds the rated value, and it can be reset manually after the fault is cleared, making it an effective tool for protecting circuits.