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Siemens QT 20-amp/30-amp 4-Pole Quad Circuit Breaker in the Circuit Breakers department at Lowes.com
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electrical - Understanding the wiring of 2-Pole Quad Circuit Breakers - Home Improvement Stack Exchange
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EATON CUTLER HAMMER BRD230240 BRD Quad Breaker 1-30A/2P 1-40A/2P 120/240V 10K Non-CTL : Amazon.co.uk: DIY & Tools
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HOMT230250 - Quad tandem circuit breaker, Homeline, 1 x 2 pole at 30A, 1 x 2 pole at 50A, 120/240VAC, 10kA AIR, plug in, UL | Schneider Electric USA
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CHOMT1515220 - Quad tandem circuit breaker, Homeline, 2 x 1 pole at 15A, 1 x 2 pole at 20A, 120/240VAC, 10kA AIR, plug in, UL | Schneider Electric Canada
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electrical panel - Can I replace a quad breaker with a tandem breaker? - Home Improvement Stack Exchange
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