A disconnector for photovoltaic applications having at least two modular contact boxes, each contact box having a box-like body coupled to a contiguous box-like body of a contiguous modular contact box. The box-like body forms a central seat that accommodates a rotatable contact and two peripheral seats, each of which accommodates a connection portion of a corresponding fixed contact that can be accessed from the outside of the modular contact box. The rotatable contact is able to rotate about the axis of the central seat with respect to the box-like body in order to engage the fixed contacts arranged with their connection portion in the peripheral seats or to disengage from the fixed contacts.