This service entrance panel is connected to the electrical meter and distributes electricity throughout the home. Each is equipped with a factory installed main circuit breaker, which serves as the main disconnect to turn off power to the loadcentre, as well as to protect the load center from an overload or short circuit. Factory installed 60A main breaker. Suitable for surface or flush mounting. CSA approved for vertical, horizontal or inverted mounting. Tandem breakers allow you to easily expand the loadcentre capacity. Tin plated copper bus bars. Main Wire Size - AWG/kcmil Al/Cu: #4-1".