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A board containing multiple electrical fuses or circuit breakers; a panelboard

An American circuit breaker panel featuring interchangeable circuit breakers

A board containing multiple electrical fuses or circuit breakers; a panelboard

Illustration of breaker numbering in a North American type panelboard. Some labels are missing, and some are additional. The numbers on the toggles indicate the rated amperage before tripping. The top right breaker (Rated at 100 A) feeds a sub panel.

A board containing multiple electrical fuses or circuit breakers; a panelboard

Electrical panel and subpanel with cover removed from subpanel.