No, there is a tandem single pole 3030 but GE does not make a tandem two pole 3030.
No tandem breakers are of the same value.
No, each segment of a tandem breaker is what the breaker rating on the handle states. Tandem breakers are used when there is no space left in the distribution panelboard. You get an extra circuit by removing the full size breaker and installing a tandem breaker,
No, a double pole 50 amp breaker protects a 240 volt supply at 50 amps. The number that is on the handle of the breaker is the amperage that the breaker will trip at if an overload occurs on the circuit.
If the breaker will snap on the bus bar, yes.
In North America this size breaker could be used on a welding machine. A range in the home would use a 40 amp two pole breaker.
No tandem breakers are of the same value.
No, each segment of a tandem breaker is what the breaker rating on the handle states. Tandem breakers are used when there is no space left in the distribution panelboard. You get an extra circuit by removing the full size breaker and installing a tandem breaker,
No, a double pole 50 amp breaker protects a 240 volt supply at 50 amps. The number that is on the handle of the breaker is the amperage that the breaker will trip at if an overload occurs on the circuit.
You have a double pole breaker for 240Volt supply. The maximum current is 15 amp.
AWG 12/2 requires the use of a 20 amp single pole breaker.
Yes.
If the breaker will snap on the bus bar, yes.
In North America this size breaker could be used on a welding machine. A range in the home would use a 40 amp two pole breaker.
If the 12,000 BTU A/C only requires 20 amps to run then yes you can use the same 12 gauge wire but you cannot change it to a 15 amp breaker. You will need to install a 20 amp double pole breaker. If it requires more than 20 amps you will have to replace the wiring and breaker.
Yes. An everyday occurrence of this circuitry is in your kitchen counter split receptacles. The top half of the receptacle is a 15 amp circuit and from the same breaker the bottom half of the receptacle is another 15 amp circuit. A two pole single handle breaker is a common trip. If one of the circuits fed from the breaker faults the other connected circuit will shut off also. If you are talking about slot position in a breaker panel, you can remove the two pole breaker and install two single pole breakers.
Single pole 20 amp breaker.
The formula you are looking for is I = W/E.