Please note: The PV inverter type must connect the inverter as source A, with the inverter and PV system serving as the main power source. Grid power serves as source B, providing stable backup power. This device is intended for use with photovoltaic systems as the primary power source and utility power as the secondary source. PC-level transfer switch with no interruption. Designed exclusively for PV systems and inverters; not suitable for use with generators or utility and generator combinations. Batch numbers may vary across different production batches; this does not affect performance. Type: 63A Color: White + Black Material: PC Size: 107 x 96 x 76mm Package Contents: 1 x Automatic Transfer Switch Note: Light and display settings may cause slight color variations between the product image and actual item. Measurement error allowance is +/- 1-3cm.