AC UPS Distribution Panels

AC Distribution Panels are essential for protecting critical loads using UPS systems during power outages. Unlike standard circuit breakers, these panels use specialized branch circuit protection to manage faults and overloads effectively. Larger UPS systems (5 kVA and above) feed their output into a distribution panel, which distributes power to critical loads through branch circuits.

In the event of a fault, the UPS inverter must supply the power to clear the fault by opening a breaker or blowing a fuse. Unlike the utility, UPS systems have limited current to clear faults, making quick and efficient protection crucial. Most circuit breakers take 2-3 cycles (up to 50 milliseconds) to open under fault conditions, while fast-acting fuses like the Ferraz/Shawmut A25X clear faults in about 4 milliseconds.

For reliable UPS protection, it is recommended to use fuses for branch circuit protection. Fused Switch AC Panelboards are designed for reliability, featuring fuses for branch circuit protection and molded case switches for isolating individual circuits. These panels can include blown fuse indicators for easy identification and replacement of blown fuses. They also offer extremely fast semiconductor fuses for sub-cycle fault clearing, flexible configurations, secure lockable doors, and custom designs.

Key Features:

• Fast semiconductor fuses for sub-cycle fault clearing.
• Flexible configuration up to 30 amperes per circuit.
• Optional blown fuse indicators.
• Coordinated fuse/breaker clearing times for critical UPS applications.
• Lockable, secure doors.
• Dead-front construction.
• UltraSafe fuse holders.
• Suitable for solid-state load protection.
• Accommodates all standard midget size fuses.
• Provides high-speed fault clearing and long-term overcurrent protection.
• Custom designs available.