EX4300, 550W DC Power Supply Airflow-In (Power Cord needs to be ordered separately), PSU-Side Airflow Intake
Part Number: JPSU-550-DC-AFI
The DC power supply in EX4300 switches is a hot-insertable and hot-removable field-replaceable unit (FRU): You can install it without powering off the switch or disrupting the switching function.
You can install up to two DC power supplies in an EX4300 switch. Power supplies are installed in the power supply slots in the rear panel of the chassis.