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What you are looking at is a two pole 100 amp breaker. Distribution panels in North America are designed to use 120/240 volts. Any two adjacent breakers will give you a 240 volt circuit and either leg to the neutral will give you 120 volts.

On the main breaker of a panel the number stated on the breaker is the amount of amperage that the breaker will allow to pass before tripping regardless of which leg the current passes through.


A 200 amp service will have a two pole main breaker with a rating stating its capacity of 200 amps.


Wire size into the breaker will give you a good clue as 100 amp breakers will use a #3 conductor whereas a 200 amp breaker will be fed with a 3/0 conductor.

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โˆ™ 2017-02-17 17:31:59
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โˆ™ 2015-07-15 19:32:17

No it does not mean you have a 200 amp service. you should / could possibly have a "main" breaker. That breaker size is your service size.

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Q: If a main has two 100A circuits does that mean it is 200A service?
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