9925920000 Circuit Protection

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Circuit breakers are an important safety feature in electricity distribution and power transfer systems. In today\'s modern world, circuit breakers come in many shapes and sizes, with a diverse range of application fields and working principles. In this article we will look specifically at the 9925920000 application field and working principle.

The 9925920000 series of circuit breakers are used in residential and commercial electric utility services, and have a maximum interrupting capacity of 5000 A at 480VAC. They are designed to detect and terminate faults in LV systems, as well as providing overload protection. The operating principle of the 9925920000 is thermal-magnetic sensing. This involves the operation of the circuit breaker in a two-step process; firstly, the thermal-magnetic function is used to detect an overload or short circuit. Upon reaching a pre-defined fault threshold, the magnetic trip component triggers and closes the contacts of the breaker.

The thermal element of the 9925920000 consists of a bimetal strip with one end thermally coupled to the other. The bimetal strip is connected to a power resistor which acts as a heat sink. When the electrical current of the breaker reaches the pre-defined threshold, the bimetal strip begins to heat. The heat causes the strip to bend back and forth, which triggers the magnetic component of the device, forcing the contacts of the breaker shut.

In addition to the thermal-magnetic sensing element, the 9925920000 also features manual/auto-reset operation, with an integral reset actuator. When the breaker triggers, it will remain in the off position until it is manually reset by the user, or automatically reset as soon as the fault condition has been cleared.

The 9925920000 series of circuit breakers also offers a range of advanced protection features. This includes adjustable delay before trip, indicating trip occurs due to an overload or short circuit, as well as adjustable time delay after reset. They are also equipped with a visual trip indicator to confirm that the breaker has operated, as well as a protective cover to prevent accidental operation, further increasing safety.

The 9925920000 series of circuit breakers offer a reliable, cost effective way of protecting LV systems. With their robust design, reliable operation and wide range of features, these breakers are an excellent choice for residential and commercial purposes.

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