D1U4-W-1200-12-HC1C vs D1U4-W-1200-12-HA2C vs D1U4-W-1200-12-HA1C

PartNumber	D1U4-W-1200-12-HC1C	D1U4-W-1200-12-HA2C	D1U4-W-1200-12-HA1C
Description	Switching Power Supplies 1200W 12Vmain 3.3Vsb front-back airflow	Switching Power Supplies 1200W 12Vmain 5Vsb back-front airflow	Switching Power Supplies 1200W 12Vmain 5Vsb front-back airflow