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    shortround3's Avatar
    shortround3 Posts: 6, Reputation: 1
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    #1

    Feb 9, 2008, 03:10 PM
    Understanding Breaker Amperage
    I have a 2 pole double throw breaker. Each side reads 30. Is the breaker 30 amps or it the breaker 60 amps? Thanks.:confused:
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Feb 9, 2008, 03:24 PM
    That 30A of 240 V coming from two 120 VAC legs that are 180 deg out of phase, thus each leg must be fused at 30 A and they will both break at the same time due to the mechanical connection.

    This out of phasing is because the primary is single phase and the secondary is center-tapped. This creates two out of phase voltages, but it is single phase power.
    shortround3's Avatar
    shortround3 Posts: 6, Reputation: 1
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    #3

    Feb 10, 2008, 07:06 AM
    Quote Originally Posted by KeepItSimpleStupid
    That 30A of 240 V coming from two 120 VAC legs that are 180 deg out of phase, thus each leg must be fused at 30 A and they will both break at the same time due to the mechanical connection.

    This out of phasing is because the primary is single phase and the secondary is center-tapped. This creates two out of phase voltages, but it is single phase power.
    Thanks for the response. I understand that each side is 30 amps. Is the breaker referred to as a 30 amp breaker or a 60 amp breaker?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Feb 10, 2008, 08:06 AM
    A 30 Amp/ 2 Pole Breaker @240 Volts
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    Feb 10, 2008, 12:30 PM
    30 A. Sorry I wasn't as explicit as necessary.
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    shortround3 Posts: 6, Reputation: 1
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    #6

    Feb 11, 2008, 03:38 AM
    Thanks for the help.

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