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Challenger A1520 Tandem Twin 15A/20A 120VAC T&B Circuit Breaker
A tandem circuit breaker is a double circuit breaker that takes up the space of a single circuit breaker on a panelboard. You'll also hear them called duplex, slimline, twin, half-height, half-inch, piggy back, double and wafer breakers, depending on local customs.
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