Photovoltaic DC string box, factory assembled by Eaton: IEC 61439-2 Annex-DD. For inverters with 1 MPP tracker: 1x IN + 1x OUT, integrated devices: PKZ-SOL PV string circuit breaker and PV surge protection device type 2, MC4 connections on the bottom of the box, IKA box 1-row with 8 pitch units and transparent window, for indoor installation only. For safe operation, please note the min. and max. permissible ambient air temperature in the technical data sheet