Does workmens comp cover me on my break?

Each state WC system is different so you need to contact an attorney in your area. The initial consultation is usually free and make sure you establish this up front. In many states like South Carolina where I practice, you are covered on your break as long as there is no "substantial deviation from your employment" while on your break. Again, each state has different laws on this so make sure you consult an attorney in your area.