The **Tripp Lite PDUMH20NET2** is a 1.9kW Single-Phase Switched Power Distribution Unit (PDU). It is a sophisticated piece of electronic equipment designed for network-grade power management, featuring both power distribution hardware and digital monitoring circuitry. --- ### 1. Key Electronic Specifications The internal electronics are designed to handle high-amperage loads while maintaining low-voltage logic for network communications. | Feature | Specification | | :--- | :--- | | **Input Voltage** | 100V, 120V, 127V AC | | **Frequency** | 50/60 Hz | | **Maximum Amperage** | 20A (Derated to 16A continuous per NEC) | | **Input Plug** | NEMA L5-20P (Twist-lock) | | **Outlet Quantity** | 16 x NEMA 5-15/20R | | **Form Factor** | 1U Horizontal Rackmount | --- ### 2. Core Electronic Components #### A. Power Switching (Relays) Unlike a standard power strip, the PDUMH20NET2 contains individual **electromagnetic relays** for each outlet. * **Function:** Allows independent "on/off" control of connected equipment via a remote interface. * **Sequential Power-Up:** The electronics are programmed to boot outlets in stages to prevent "inrush current" from tripping circuit breakers. #### B. The Network Management Card (LX Platform) This is the "brain" of the PDU. It is a built-in computer module that runs a Linux-based firmware. * **Microprocessor:** Handles the web server, SNMP protocols, and SSH access. * **Java-Free Interface:** Modern versions use an HTML5 interface, removing the need for legacy Java plugins. * **Internal Storage:** Keeps logs of power events and environmental data. #### C. Monitoring Circuitry The PDU includes an **Ammeter** and digital sensors: * **Local LED Display:** A 2-digit display on the front panel provides real-time monitoring of the total load in Amps. * **Precision Sensors:** Internal shunt resistors measure the current flow to ensure the user stays within the 20A limit, preventing overloads. #### D. Communication Ports * **RJ45 Ethernet:** For network connectivity. * **USB-B Port:** For local configuration and firmware updates. * **ENVIROSENSE Port:** A specialized RJ45 port meant for connecting external probes (Temperature, Humidity, or Contact Closure sensors). --- ### 3. Protection and Safety Systems * **Circuit Breakers:** A 20A physical breaker protects the internal electronics and connected loads from over-current conditions. * **EMI/RFI Filtering:** Internal capacitors and inductors filter out electromagnetic and radio frequency interference to provide "cleaner" power to sensitive IT equipment. * **Grounding Lug:** A dedicated chassis screw for ensuring the rack and PDU share a common earth ground. ---