The sum of the breakers in a panel exceeds the rating of the main breaker in almost all applications. This is because of the design usually anticipates that all devices won't operate at once or at full load. So if you had 100 Amp service and you had ten 20 Amp breakers each happily drawing 15 amps that would be 150 Amps and the main would trip. You need to heavy up your service.
You can't change the one breaker, but you can't use two separate arc fault breakers unless you separate the neutrals. However double pole arc fault breakers are made for this purpose and the common neutral would be O.K.
3 pole would be for 3 phase, 4 pole would be 3 phase & neutral
It sounds like the breaker is unserviceable. Seeing as it supplies 240 volt outlet it must be a two pole breaker. If it is a single handle two pole breaker then one pole set inside the breaker is not disconnecting one of the lines. If it is supplied from two single pole breakers that has a common tie, the common tie might be loose and does not shut off both poles when thrown to the off position. If there is no common tie then both breakers must be turned off to interrupt the 240 volt supply.
If by "60 amp box" you mean a 60-amp service panel (circuit breakers or fuses), you would generally get a 60-A panel that has several slots designed to accept a variety of compatible breakers, from 15A to 60A. If you have a "box" with no breakers, you would need another "subpanel", with wires from the 60A box to the new subpanel, and install one or more 15A breakers in the subpanel. If you don't need more than one breaker, you might also simply use a 15A disconnect panel with a single breaker in it.
The electrical terminology for this type of breaker is a tandem breaker. It is where two breakers circuits can be in the same one breaker slot in a distribution panel. On this type of breaker there will be two output for a circuit value of what ever the breaker is rated for.
AF refers to the ampere rating of the breaker frame and AT refers to the breaker trip rating in amps. These are not breakers that you would find in your home but industrial molded case breakers. The current trips can be changed out to different values all within the same frame size.
No, it would not be safe because 250v is too high for that breaker. <<>> In North America all household breakers are rated at 120/240 volts. A 250 volt 15 amp breaker would would be a two pole breaker and take up two slots in the distribution panel. This can be pulled out and replaced with two separate 15 amp breakers or one 15 amp breaker and a slot panel filler to cover the second slot.
250AF refers to the ampere rating of the breaker frame and 200AT refers to the breaker trip rating in amps. These are not breakers that you would find in your home but industrial molded case breakers. The current trips can be changed out to different values all within the same frame size.
250AF refers to the ampere rating of the breaker frame and 200AT refers to the breaker trip rating in amps. These are not breakers that you would find in your home but industrial molded case breakers. The current trips can be changed out to different values all within the same frame size.
Small size home breakers have a fixed setting and can not be adjusted. Three phase moulded case breakers have adjustable trip settings on the load side of the breaker. These overloads can be set for motor inrush to stop the breaker from needless tripping and yet still protect the other equipment down stream from the breaker.
I am assuming by your description that the panel is protected by a 90 amp breaker and the breakers in the panel when added up is 200. This is okay as long as your 90 amp breaker trips on a regular basis. It is typical for the breakers to add up to more than the main breaker under the assumption that you would rarely be running each circuit at its maximum capacity.
No, add new breaker,find a junction box and split the series, or add a box and split the load. You only need to do this if the breaker is tripping from overload. 12ga wire should have a 20amp breaker not a 15amp. If I understand your question,wired in parallel, this would be one hot connected to two breakers, first off two breakers is 220v not 120v , and 220v has two hot wires. Never connect two breakers together on one line.