Square D bolt-on circuit breaker has a voltage rating of 120/240 Volts current rating of 20 Amps and interrupting rating of 10 kilo-Amps. Explore a wide range of our 220A Breaker selection.
Short answer: To size a solar array, divide your daily kWh usage by your local peak sun hours, then divide by a 0. That gives you required DC kilowatts of panels. For a home using 20 kWh/day at 4.