The Enterasys SSA-AC-PS-625W, also known by part number P0973LQ and model TC71S-1522, is a high-output power supply module specifically designed for the Enterasys S-Series Standalone (SSA) switches. In the demanding environment of a core or distribution switch, the power supply must be capable of supporting high-density line cards and high-speed switching fabrics without faltering.
With a 625-watt output capacity, this power supply provides ample headroom for fully populated SSA chassis. It is designed to handle the dynamic load changes associated with high-bandwidth data bursts. The unit features advanced power factor correction (PFC) to ensure that it draws power efficiently from the AC source, reducing the overall electrical load on the data center's infrastructure.

To protect the expensive S-Series switching hardware, the SSA-AC-PS-625W includes a comprehensive array of protection circuits. This includes over-voltage protection (OVP), over-current protection (OCP), and thermal shutdown capabilities. In the event of an electrical anomaly, the power supply isolates the switch components, preventing cascading hardware failure and ensuring that a power issue remains localized.
In redundant S-Series configurations, the SSA-AC-PS-625W is designed for hot-swappability. This means that a technician can replace a power supply module while the switch remains operational, provided a second power source is active. The module features a rugged handle and a secure locking mechanism to facilitate easy removal and insertion in the chassis, even in high-density rack environments.
The P0973LQ features integrated cooling fans that adjust their speed based on the load and ambient temperature. This "smart cooling" helps in extending the lifespan of the internal capacitors and transformers—the components most susceptible to heat-related wear. With its high MTBF rating, the SSA-AC-PS-625W is a cornerstone of network reliability for Enterasys-based infrastructures.



