A 200-amp breaker is appropriate for a home upwards of 2000 square feet. Smaller buildings can use 150-amp or 100-amp; small homes and subpanels can use as little as 50-amp.

For example, the price of a single-pole (120-volt) 15-amp breaker may only cost $5 – though, Amazon's highest rated 15-amp breaker lists for $12.