This is a PD4060CSV 60 Amp Converter Section for Progressive Dynamics PD4060KV.  It is new in box.  Free shipping from US seller.

RV Converter Charger with LiFePO4/Lead-Acid Switch, Upgrading RV to Lithium Batts, for PROG Dynamic PD4060CSV, 4000 Series

Built with a selectable charging profile switch for both lead-acid and LiFePO4 lithium batteries. If you want to upgrade your caravan battery system to advanced lithium batteries and also hope to do so without replacing the entire power center, then this product is suitable for you

Stable & High-Efficiency Power Conversion: 60 Amps Maximum Output; 725 Continuous Watts; 80% High Conversion Efficiency; steadily converts 105-130VAC input to 13.6VDC stable power supply; supports continuous power supply and battery charging for RV electrical systems with consistent and reliable working performance