APC Back-UPS CS BK350 – 350 VA Standby UPS

Overview

The APC Back‑UPS CS BK350 is a compact, standby uninterruptible power supply (UPS) engineered to maintain power for essential electronics during brief utility outages and mitigate transient events such as surges and spikes. It is typically deployed by small office administrators, IT support staff, and home users to protect networking equipment, desktop systems, and peripherals where basic power continuity is required.

This UPS delivers a rated capacity of 350 VA / 210 W with an AC input/output nominal of 120 V. Standby topology and a stepped approximated sine wave output allow the unit to switch to battery support within milliseconds when incoming voltage falls outside operational thresholds.

The chassis is a vertical tower form factor designed for placement beside workstations, network closets, or shelf mounts where footprint space is limited. On‑unit LED indicators and audible alarms provide real‑time status for line power, battery mode, overload, and fault conditions.

Internally, a sealed maintenance‑free lead‑acid battery provides DC energy for supported loads. The battery is user‑replaceable, enabling service without full unit replacement, and typical full recharge time is approximately 8 hours after deep discharge.

The BK350 includes both battery‑backup plus surge and surge‑only receptacles, allowing separation of critical and non‑critical loads to maximize runtime for essential devices without drawing on battery capacity for non‑essential equipment.

Key Features

• 350 VA / 210 W standby UPS with stepped approx sine wave
• Six NEMA outlets (battery + surge and surge‑only)
• Sealed, maintenance‑free lead‑acid battery
• USB and serial communication ports for basic management
• LED and audible status indicators for power events

Specifications