To determine the correct amp breaker required for a 3200-watt, 240-volt/60Hz wall oven, you can use the formula:
Amperage = Wattage / Voltage
Amperage = 3200 watts / 240 volts ≈ 13.33 amps
Since amperage ratings for circuit breakers usually come in standard sizes, you should round up to the nearest standard value. In this case, a 15-amp breaker would be too low, and a 20-amp breaker is appropriate, but it leaves little to no room for any additional load on the same circuit. It's essential to have some safety margin, so a 20-amp breaker is the minimum requirement.
As for the type of breaker, for a 240-volt wall oven, you will typically need a double-pole breaker. Double-pole breakers have two hot wires that provide 240 volts to the appliance, whereas a single-pole breaker only provides 120 volts.
To summarize, a double-pole 20-amp breaker should be suitable for your 3200-watt, 240-volt wall oven. If you're unsure about any electrical work, it's always best to consult with a qualified electrician to ensure safety and compliance with local electrical codes.