UPS PULSAR SWB-300RACK buffered power supply for PoE switches 54V DC 300W 4×17Ah

UPS PULSAR SWB-300RACK buffered power supply is a rack-mount unit that delivers 54V DC and up to 300W of continuous power for PoE network switches. Designed to provide stable DC output and backup autonomy, it includes four 17Ah batteries to maintain operation during mains interruptions. The unit supports controlled shutdown and protection functions to preserve connected equipment and is intended for use in server rooms, telecom closets and surveillance systems that require uninterrupted PoE power.

Advantages

The PULSAR SWB-300RACK offers a compact rackable design that integrates buffered DC power and battery backup, minimizing installation footprint. Built-in battery capacity ensures sustained operation of PoE switches during power outages, while protective circuitry and controlled shutdown features reduce the risk of damage to network devices. The unit’s stable 54V DC output provides compatibility with standard PoE switch inputs and simplifies power distribution in rack environments.

Suitable for

• Feeding PoE network switches in server rooms and data cabinets
• Powering network equipment in telecom closets and MDF/IDF racks
• Supplying surveillance systems with continuous PoE power for cameras and NVRs
• Environments requiring controlled shutdown and short-term battery autonomy

Key specifications

• Output voltage: 54V DC
• Maximum output power: 300W
• Battery configuration: four sealed lead-acid batteries, each 17Ah
• Form factor: rack-mount housing suitable for standard server racks
• Functions: buffered DC supply, battery-backed operation, controlled shutdown and protective circuitry

How to use

Install the SWB-300RACK into a compatible 19-inch rack space and connect mains power according to the installation manual. Connect the 54V DC output to the PoE switch input or distribution bus using appropriate cabling and polarity. Verify battery connections and charge status before placing the unit into service. During normal operation the unit supplies stabilized DC power and charges the batteries; if mains fails the batteries automatically supply load current and controlled shutdown procedures can be executed if configured.

Usage recommendations

Place the unit in a well-ventilated rack location away from direct heat sources, ensure access for maintenance and periodic battery checks, and use cables and connectors rated for 54V DC and the expected current. Follow manufacturer guidance for battery replacement intervals and disposal. For critical installations, test failover behavior and load autonomy to confirm required backup time for your PoE devices.