Yes all breakers will get warm when in use. The full load current of the load flows through the device. Class A breakers current trip rating is rated at 40 degrees C. If in ambient temperatures higher that 40 C then the thermal trip rating lowers. Likewise if the ambient temperature becomes lower the trip rating increases. Sometimes breakers have to be rearranged in the electrical panel to keep high current breakers away from each other. The ambient temperature of adjacent breakers will raise a breakers temperature and cause needless tripping.
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A 20 amp circuit breaker may get slightly warm during normal operation, but excessive heat could indicate an issue such as overload, loose connections, or a faulty breaker. If the breaker is excessively warm or hot, it should be checked by a qualified electrician to prevent any potential hazards.
It is normal for a circuit breaker to feel warm or even slightly hot during operation, especially on very hot days, as it is designed to carry and interrupt high levels of electrical current. However, if a circuit breaker becomes excessively hot to the touch or emits a burning smell, it may indicate an underlying issue that requires attention from a qualified electrician.
A 50-amp GFCI circuit breaker may get hot if it is overloaded or if there is a loose connection at the breaker terminals or in the circuit. It could also indicate a faulty breaker that needs to be replaced. It's important to address this issue promptly to prevent damage or fire hazard.
Operating a breaker on a continuous current, close to the breaker's tripping point can cause this condition. Because the breaker is a thermal device the heat builds up over a time period. Check the breakers on either side of the faulting breaker. If these breakers are also warm from use they take away the heat sink effect and do not let the faulting breaker cool down. Check the current of the load to see how close you are operating to the breakers trip point. Over time the trip setting of the breaker can become lower to a point where it will not reset. Changing the breaker out should rectify this non resetting condition.
To identify which circuit breaker controls an outlet, plug in a lamp or device and then switch off the breakers one by one until the device turns off. Once the device is off, you've located the correct circuit breaker for that outlet. Alternatively, you can use a circuit breaker finder tool that can help you locate the specific breaker efficiently.
I believe that the wires supplying a 30 amp circuit must be at least 10 gauge. If you have 14 or 12 gauge wires going to or from your 15 amp breaker, then drawing 30 amps over it could cause a fire hazard. It's like using those cheapo non-UL certified extension cords to plug a MILLION X-mas lights into (drawing more power than the wires can handle). You also have to make sure this GFI outlet you refered to is rated for 30 amps. Do not simply swap out breakers. Overloading the wires in the circuit protected by that breaker will cause a fire. If you need a 30 amp circuit you must run #10 gauge wire.