3120-F311-P7T1-W15FY4-20A

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Circuit breakers are an essential component in modern power systems. 3120-F311-P7T1-W15FY4-20A is a circuit breaker specifically manufactured to suit the requirements of different applications and power ratings. This article focuses on its application field and working principle.

Application Field

3120-F311-P7T1-W15FY4-20A is suitable for use in industrial, commercial and residential buildings as a means of protecting the electrical circuits from overvoltage and overcurrent caused due to faults. It is suitable for use in systems of up to 15.5kV and meets UL 489 and UL 1077 requirements for ground-fault circuit interrupters (GFCI) and general-use circuit breakers (GCCBS).

The 3120-F311-P7T1-W15FY4-20A is capable of providing excellent performance under normal operating conditions, covering a wide range with low thermal losses. It includes a shunt trip with 350-450V voltage rating and various auxiliary contacts like timing relays, alarms and control switches. The circuit interrupters are also equipped with thermal-magnetic trip units, which are available with varying operating current levels and time delays of either 0.3 or 0.6 seconds.

Working Principle

3120-F311-P7T1-W15FY4-20A works on the principle of thermal-magnetic operation. In normal operation, the electrical current running through the circuit is sensed by the circuit breaker’s built-in thermal elements. These elements sensing the heat generated by current, convert it into magnetic energy, thereby activating the triggering of the circuit interrupters. This thermal reaction leads to the breaking of the circuit and preventing the flow of further current. In case of an overcurrent situation, the circuit breakers also feature a magnetic trip mechanism which can have time delays of either 0.3 or 0.6 seconds and can be adjusted for different current levels.

The circuit interrupters come with an adjustable trip setting which can be used to set a cut-off point for current flow. When the current exceeds this set value, the breaker trips and interrupts the current flow.

The 3120-F311-P7T1-W15FY4-20A circuit breakers also include a shunt trip function. It is activated whenever an insulation fault occurs. This mechanism further ensures that the circuit breaks as soon as the insulation fault is detected and the current flow is stopped.

Advantages

The 3120-F311-P7T1-W15FY4-20A circuit breakers offer several advantages over its predecessors. First, its thermal-magnetic operation ensures a much larger degree of protection than a simply-tripped breaker. It also offers a great deal of flexibility, as the current cut-off point can be adjusted depending on the application. Third, its shunt trip function ensures that dangerous insulation faults are detected quickly and dealt with immediately.

In addition to all these advantages, the 3120-F311-P7T1-W15FY4-20A circuit breakers also come with minimal thermal loss and are designed for long service life. Overall, it is an excellent product for your electrical system’s protection.

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