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Juniper JPSU-400W-AC is a hot-swappable AC power supply unit used in various Juniper network equipment platforms. It delivers up to 400 watts of power, ensuring stable and continuous operation of compatible Juniper switches and routers.

This PSU is designed to support redundant power configurations, improving system reliability and uptime by allowing one power supply to take over in case of failure. It is commonly used in enterprise and service provider deployments where high availability is critical.

The unit supports standard AC input and is engineered for efficient power conversion with built-in protection features such as over-voltage, over-current, and thermal protection. Its hot-swappable design allows replacement without shutting down the system, minimizing network downtime and maintaining operational continuity.