Yes, but you need a power source, for the shunt trip coil voltage, in the circuit.
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No, a shunt trip breaker requires a separate power source to trip the breaker remotely. It cannot be activated by a dry set of contacts alone.
A circuit breaker protects the wires that the devices are connected to. If the devices that are connected to the circuit are 20 amps the wire size should be #12 wire fed from a 20 amp breaker. This breaker should not trip unless the circuit is overloaded or a fault occurs on the circuit. If the devices that are connected to the circuit are15 amps the wire size should be #14 wire fed from a15 amp breaker. This breaker should not trip unless the circuit is overloaded or a fault occurs on the circuit. Putting 20 amp sockets on this 15 amp circuit will work but the circuit is limited to the amount of load that can be plugged in. You will not get the full capacity of the 20 socket because the breaker will trip at 15 amps.
The breaker is likely tripping due to an overload or short circuit on the circuit that the hot wire is connected to. Disconnecting the hot wire stops the flow of electricity and eliminates the source of the overload, allowing the breaker to reset. It is important to investigate and address the underlying cause of the overload to prevent future tripping.
Breakers limit the current on the conductor to a safe level, too many appliances plugged in. You trip a breaker, hopefully you then transfer load to another circuit. Breakers use two different methods to accomplish this, one uses a bimetallic strip and the current passes directly through, too high a current causes the strip to deflect. It acts on a mechanism much like the sear in a guns trigger, the deflection pulls the trigger causing a spring to open the contacts and turn off the circuit. Another type is thermal magnetic, current passing through the breaker causes a magnetic field to act on a coil tripping the breaker. When breakers are wired and work properly they prevent fires!Bending metal opens a switch
A trip switch, also known as a circuit breaker, works by detecting an overload or short circuit in an electrical circuit and automatically interrupting the flow of electricity to prevent damage or fire. When the circuit breaker detects an abnormality, it quickly switches off to cut off power and protect the circuit from further damage. Resetting the trip switch restores power once the issue is resolved.
A GFCI breaker monitors the imbalance of current between the ungrounded (hot) and grounded (neutral) conductor of a given circuit. With the exception of small amounts of leak-age, the current returning to the power supply in a typical 2-wire circuit will be equal to the current leaving the power supply. If the difference between the current leaving and returning through the current transformer of the GFCI exceeds 5 mA (61 mA), the solid-state circuitry opens the switching contacts and de-energizes the circuit. Touch the neutral or hot and you change this current which will trip the breaker.