991130 Circuit Protection

Circuit Breakers

Circuit breakers are used to disconnect electrical circuits in fault conditions or during maintenance activities. The 991130 is a circuit breaker that is specifically designed to be used in applications where load current, short-circuit currents, or other environmental factors could be harmful to personnel or equipment.

991130 Application Field

The 991130 circuit breaker is designed to be used in medium voltage circuit breaker applications where operating conditions cause a need for special consideration. These conditions may include, but are not limited to, high temperatures, corrosive atmospheres, mechanical shocks, and vibrations. Additionally, this type of circuit breaker is often used in applications where multiple sources of power are present and switching of loads between these are required. Examples of these applications are in power plants, wind turbines, communication networks, and industrial sites.

Working Principle

The 991130 is designed so that it will disconnect the power supply when the current travelling through it exceeds a predetermined value. The limit of current is determined by setting a switch within the breaker. This switch is triggered by the current passing through the circuit breaker, and it causes the contacts within the breaker to separate, thus disconnecting the power. This limit is usually set significantly lower than the rated current, so that the switch will be triggered before the rated current passes through the circuit. This ensures that personnel and equipment are protected from any potential over-currents.

The 991130 also contains an internal thermal element. This element is designed to detect if the temperature of the breaker is too high, and it will automatically open the breaker if the temperature rises above its rated limit. This protects against motor or resistor overloads or similar problems which would cause the breaker to overheat.

Conclusion

The 991130 circuit breaker provides a safe, reliable way to protect personnel and equipment in applications where high temperatures, corrosive atmospheres, mechanical shocks, and vibrations may prevent the use of a standard breaker. By setting a switch to limit the maximum current and by using an integrated thermal element to detect temperature increases, the circuit breaker is able to safe guard against over-currents and overheating.