Check out this electrical panel – no main fused switch or breaker Most circuit breaker panels have two vertical rows of breakers. Above (or sometimes below) the rows is a large breaker called the main breaker. This breaker controls the power to all of the other breakers. If you switch off the main breaker, you turn off all the circuits in the house at once.
Saskatchewan electrical code: Where a panelboard can employ more than two single-pole breakers, one two-pole breaker, or one three-pole breaker they shall be installed in an approved assembly on the load side of a main fused switch or breaker.