Making the choice between 3- and 4-pole switching is more than just a choice based on cost and complexity, each has its own advantages and a misunderstanding of solid or switched neutral systems will have consequences for safety and regulatory compliance. Eaton's white paper provides guidelines on the best balance between compliance, safety and economy.
![Eaton_3-4_pole_switching_white_paper](https://img.en25.com/EloquaImages/clients/EatonElectrical/%7B4ee39e26-f988-4bb9-9bfd-9c12a6d5eb9e%7D_Eaton_3-4_pole_switching_white_paper.jpg)