30A x 220V = 6600 W
30A x 240V = 7200 W
Usually, the resistance heaters are rated at 240v, but your supply might be more like 220V. The numbers sound about right if you have 7 kW of aux. heat. There is a wide range of options for aux. heat and emergency heat, so it is hard to say if this number is "correct" unless we know what you have.
The aux. heat helps out the heat pump during cold weather to keep up with demand. There is normally an emergency heat option as well. This runs the heat strips, but not the compressor. This is so that you still have heat if the compressor fails.
Often, the aux. heat rating can be less than the emergency heat rating. For instance, you might have 10kW of aux. heat and 15kW of emergency heat. The actual values depend on the system and heating loads. A given model of heat pump can have a wide range of heat strips installed. You would have to see what is installed in yours as just having the model number won't tell you much.
You are lucky. I have an electric furnace (no heat pump) and that thing draws 106A+ whenever it runs. It is the only heat source, so it runs a lot.
The good thing about resistance heat is there is very little that can go wrong with it.