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The Reliance Controls, TCA1006D is designed as a single load switch. This means that the transfer switch does not contain circuits, but rather will feed power downstream to either a branch circuit, or sub-panel. As this is rated as a service entrance, it is suitable to use for "the house" so long as that load does not exceed 100 amps. This device is a double pole, double throw system that will break one circuit prior to making the other.