ABB SACE PR120 / D-M MEASURING COMMUNICATION MODULE SACE PR120 16:11

ABB SACE PR120/D-M MEASURING COMMUNICATION Module SACE PR120

Brand: ABB
MPN: SACE PR120/D-M
Type: COMMUNIATION
Nr: O0986W05A

The ABB SACE PR120 is a sophisticated digital module designed to enhance the capabilities of ABB’s Emax 2 air circuit breakers. It transforms a standard power circuit breaker into an intelligent, networked device capable of precise measurement, protection, and communication.

Its core designation, D-M, stands for “Display – Measurement”, indicating its primary functions: a local human-machine interface (HMI) and advanced electrical parameter measurement.

Key Features and Functions

1. Measurement and Monitoring (The “M” in D-M)

The PR120 acts as a high-precision power quality analyzer, continuously monitoring a wide range of electrical parameters, including:

• Basic Parameters: Current (per phase and neutral), Voltage (line-to-line and line-to-neutral), Frequency, Active, Reactive, and Apparent Power, Power Factor.

• Energy Metering: Import/Export of Active and Reactive Energy.

• Power Quality: Harmonics analysis (up to the 15th harmonic for current and voltage), Total Harmonic Distortion (THD).

• Demand Monitoring: Calculates and tracks maximum power demand to help with load management and avoid peak tariff penalties.

2. Local Display and Interface (The “D” in D-M)

The module features a clear, backlit graphical LCD display that provides:

• Real-time Data: Instantaneous values of all measured parameters.

• Metering Data: Historical energy and demand values.

• Event Logging: Records the last fault events (e.g., tripping due to overcurrent) with a time stamp.

• Status Indication: Shows the breaker state (ON, OFF, Tripped) and readiness.

• Configuration Menu: Allows on-site setting of protection thresholds, display language, and communication parameters.

3. Communication Capabilities

This is a critical function. The PR120 module includes a built-in communication port for integration into Building Management Systems (BMS) or Industrial SCADA systems.

• Standard Protocol: It typically communicates using the Modbus RTU protocol over an RS-485 serial link.

• Integration: This allows remote monitoring of all measured values, remote control of the breaker (OPEN/CLOSE), and configuration changes from a central software platform.

4. Enhanced Protection

While the primary protection functions (like instantaneous and short-time overcurrent) are handled by the main trip unit (like the PR121/P, PR122/P, or PR123/P), the PR120 module adds:

• Protection Relays: It can be configured to provide additional protection functions such as:

  • Under/Over Voltage

  • Under/Over Frequency

  • Thermal Overload (based on measured current)

  • Directional Power Protection

Technical Specifications (Summary)