You’re likely to see switches for three different types of circuit breakers in a panel-single pole, double pole and ‘tandem.’ Single-pole breakers feed 120-volt circuits for ceiling lights ...

Unlike a double-pole breaker, which serves a single 240-volt circuit, a tandem serves two 120-volt circuits; it cannot be used to supply 240 volts to a single circuit. A different type of doubled ...

G3040BL1200 = 30 spaces, 40 total circuits allowed.Up to 10 tandem circuit breakers can be used. G3030BL1150 = 30 spaces, 30 total circuits allowed.Tandem circuit breakers are not allowed ...