Is it okay to use lightning arresters to protect both phase and phase?

Following the question above, yes, but there are design requirements, not just a combination of six arresters. ABB has similar products, but they are bulky and usually have a separate cabinet. Some imported electric arc furnaces are equipped with interphase lightning arresters, which are also bulky. The six-column product you mentioned is the patent of Anhui Yitian Electric. The latest design specifications also specifically mention issues related to interphase arresters.