Photovoltaic DC string box, factory-mounted by Eaton: IEC 61439-2 Appendix DD. For inverters with 2 MPP trackers: 2x IN + 2x OUT, integrated devices: PKZ-SOL PV string circuit breaker and PV surge protection device Type 2, MC4 connections at the bottom of the box, IKA box 1-row with 18 division units and clear window, designed for indoor installation only. For safe operation, please observe the minimum and maximum allowable ambient air temperatures in the technical data sheet.