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The physical amount of breakers that can be added to a load-center or for that matter an electrical panel is governed by the amount of slots that are available. This holds true no matter what the amp capacity of the unit is.
What you don't want to do is, turn on more than 100amp worth of circuits at the same time! In other words if you have 200 circuits all hooked to the same 100amp box, all rated at 10amps each, you can only turn on 10 circuits at the same time without blowing the 100amp circuit breaker.
You can install as many breakers in the 100 amp panel as it is designed to take. If it is a 16 circuit panel you can fill it up with as many different combinations as you like. The reasoning behind this is the panel board is designed to to take a 100 amp main breaker. All of the buss bars in the panel are designed to have a capacity of 100 amps. No matter which breakers you use, when the capacity of 100 amps is reached the main breaker will trip. To see if your panel is big enough total up your appliances. Range 40 amps, dryer 30 amps, hot water tank 20 amps. If all of these devices were on at the same time they total 90 amps. This leaves you 10 amps for the rest of the house. Plug in a toaster and the main breaker will trip. The average use in the home at any one time is about 50 to 60 amps.
There is no particular limit. You could have 30 20-Amp breakers if the panel has enough room for them, or wire multiple 100-A panels together with as many 20-A breakers as you have branch circuits.
Obviously the amount of simultaneous power utilization is not determined by the number of circuit breakers but rather by the main breaker rating.
It is not uncommon to see 500 A or more of branch protection in a 100A system, meaning only that each BRANCH is protected for 15A, 20A, 30A (i.e., the overcurrent in those conductors and devices), not that you can ever use over 100A at the same time.
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Can a 100 amp main have 2 50 amp breakers?
Yes, a 100 amp main panel can have 2 separate 50 amp circuits protected by 50 amp breakers. This configuration allows for two separate circuits drawing up to 50 amps each from the main panel without overloading the panel's 100 amp capacity.
How many 20 amp double pole breakers can go into a 100 amp panel?
The provisioning of the breakers in a panel has a physical limitation regarding how many breakers will fit and a load calculation based on what devices the panel has to support. Your question really applies to both types of breakers. There are rules of thumb for sizing and populating the panel. This information is in the National Electric Code. If you have an existing panel and a new application requiring additional breakers for 220 Volt applications, the current draw in panel can be measured by an electrician and you will know what additional load you can support. If breakers fit physically in the panel, but connected devices exceed the total current capacity you will trip the main panel breaker. At this point you would need to get an electrician involved.
Why does a 100 amp circuit breaker panel have 30 breakers that are 20 amps?
There is no reason, it is most likely what the the installer did.
How many 50 amp breakers feeding 50 amp outlets can you install from a 125 amp main panel?
You can install a maximum of two 50 amp breakers feeding 50 amp outlets from a 125 amp main panel. Each 50 amp breaker is using half of the available amperage from the main panel.
How many 50 amp 3 phase breakers can you install in a panel?
The number of 50-amp 3-phase breakers that can be installed in a panel depends on the panel's capacity, which is typically rated in terms of total amperage. To determine the maximum number of breakers, divide the panel's total amperage by the individual breaker amperage rating. For example, if the panel has a total capacity of 200 amps, you can install up to four 50-amp 3-phase breakers.
