、The code PQM-T20-C-A refers to a **PQM-T20 Power Quality Meter** manufactured by GE Grid Solutions (formerly GE Industrial Solutions). Here's a breakdown of the information you might find:

**Function:**

* The PQM-T20 is a digital meter designed to monitor and analyze the quality of electrical power in a system. It measures various parameters beyond basic voltage and current, providing insights into:
    * Voltage and current harmonics (deviations from a pure sine wave).
    * Power factor (efficiency of power usage).
    * Power consumption and demand.
    * Power quality disturbances like voltage sags, swells, and transients.

**Features (Possible):**

* The specific features depend on the model variant (indicated by T20-C-A). However, general features might include:
    * Measurement of various power quality parameters like voltage, current, harmonics, power factor, and energy consumption.
    * High accuracy and data logging capabilities for recording power quality events.
    * Communication ports (RS232, RS485) for connecting to SCADA systems (Supervisory Control and Data Acquisition) or building management systems.
    * User interface with a display for visualizing power quality data and trends.
    * Potential for additional options like control relays for automated responses to power quality events (based on model variant C).
    *  Four isolated analog outputs (based on model variant T20) for transmitting measured parameters to external devices like data recorders or controllers.

**Applications:**

* PQM-T20 is used in various applications where monitoring and maintaining power quality is crucial, such as:
    * Industrial facilities: Ensuring efficient power usage, preventing equipment damage from power disturbances, and complying with industry power quality standards.
    * Commercial buildings: Optimizing energy consumption, identifying potential electrical problems, and improving building efficiency.
    * Data centers: Maintaining consistent power quality for critical IT equipment and preventing downtime.
    * Power generation and distribution systems: Monitoring grid stability, identifying power quality issues, and improving overall system reliability.

**Finding More Information:**

Here are some resources for your search:

* **GE Grid Solutions Website:** The GE Grid Solutions website ([https://www.gegridsolutions.com/](https://www.gegridsolutions.com/)) offers information on the PQM-T20 meter. Search for "PQM-T20" to find product brochures, user manuals, and potentially application notes or datasheets with detailed specifications.
* **Authorized Distributors:** Contact an authorized GE Grid Solutions distributor in your region. They might have access to technical resources or legacy product information that can provide more details about the PQM-T20, especially for older model variants.

**Additional Notes:**

* The "T20-C-A" part of the code describes the model variant with specific functionalities:
    * "T20" likely indicates the presence of a transducer option for additional current and voltage measurement capabilities.
    * "C" might signify the inclusion of control relays for automated responses to power quality events.
    * "A" could refer to the meter having a display for user interaction.

If you have the complete model number (including any additional digits or letters), you can find even more specific information about the PQM-T20 variant.