The FPR2K-PWR-AC-400 is a 400W AC internal power supply module designed for use with Cisco Firepower 2000 / 2100 series firewalls. Part of Cisco’s Firepower 2000/2100 NGFW (Next‑Generation Firewall) line of devices/ threat defense roles. Because it is internal and plug‑in, installations are cleaner and power connections more direct. Also, for devices that support redundancy or dual‑power supplies, this module can act as one of the AC supplies.

Advantages of the FPR2K‑PWR‑AC‑400

1. High Output Capacity (400W): It delivers a strong 400 Watts of AC power, enough to support demanding security/firewall loads on the Firepower 2100 series without power constraints.

2. Global AC Compatibility: The input is rated for 100‑240V AC, 50‑60Hz. This broad range makes it usable in many countries without needing special transformers.

3. Hot‑Pluggable / Redundancy Support: You can replace this supply without powering down the device (if the chassis supports dual supplies), which improves uptime and lets you do maintenance with less disruption.

4. High Reliability & Protection Features: It includes protections (overvoltage, undervoltage, short circuit etc.) to safeguard both the PSU and the firewall equipment.

5. Efficiency and Power Management: Many vendor sources say it has high efficiency (sometimes “80 PLUS class” or “high-efficiency conversion”), power management/monitoring, which translate into lower heat and reduced energy costs.

6. Consistent / Stable Power Supply: Helps maintain firewall performance and stability even under heavy load or during power fluctuations, ensuring that security services are not degraded.

7. Standard Form Factor & Ease of Installation: It’s designed as an internal module matching the Firepower 2100 series standard. The form factor, connectors, etc., are compatible, which simplifies replacement, spare inventory, and reduces compatibility issue

8. Scalability / Future‑Proofing: Because it works across multiple models in the Firepower 2100 series (2110, 2120, 2130, 2140), deploying it means you can reuse spares or move supplies between devices, which helps in investment protection.

9. Wide Operating Environment: It supports a reasonable operating temperature range, humidity levels, and other environmental parameters typical for enterprise gear, making it suitable for data centers/branch offices etc

Limitations

• Not Universally Compatible: Designed only for the Cisco Firepower 2100 Series (e.g. 2110, 2120, 2130, 2140) thus cannot be used with other Cisco devices like ISR routers, Catalyst switches, or ASA series firewalls.
• AC Only – No DC Variant: This is an AC-only power module. If you operate in DC-powered data centers (e.g. telco, industrial), this model won’t work.
• Single PSU by Default (No Redundancy Without Optional Upgrade): Many Firepower 2100 models ship with just one PS, if redundancy is needed, you must purchase a second FPR2K-PWR-AC-400 separately.

Who It’s For / Use Cases

• Enterprises and branch offices that need solid, reliable power to support Firepower 2100 firewall appliances.
• Environments where security features are always on, and firewalls are doing threat inspection, VPN, etc., so a dependable PSU is essential.
• Deployments where uptime is critical, so features like hot‑swap and (if supported by the chassis) redundancy are important.